refactor: merge --si and --display-kb

add new option: --output-format this controls how the output is
summarised and takes:

 nothing = default behaviour
 si = SI units (same as old --si flag)
 b = bytes
 kb = kb
 kib = si kb
 mb = mb
 mib = si mb
....etc

12 files changed, 120 insertions, 140 deletions

diff --git a/README.md b/README.md
index 7a4b0ae..79da23f 100644
--- a/README.md
+++ b/README.md
@@ -68,7 +68,7 @@ Usage: dust -d 3  (Shows 3 levels of subdirectories)
 Usage: dust -D (Show only directories (eg dust -D))
 Usage: dust -F (Show only files - finds your largest files)
 Usage: dust -r (reverse order of output)
-Usage: dust -H (si print sizes in powers of 1000 instead of 1024)
+Usage: dust -o si/b/kb/kib/mb/mib/gb/gib (si - prints sizes in powers of 1000. Others print size in that format).
 Usage: dust -X ignore  (ignore all files and directories with the name 'ignore')
 Usage: dust -x (Only show directories on the same filesystem)
 Usage: dust -b (Do not show percentages or draw ASCII bars)
diff --git a/completions/_dust b/completions/_dust
index 4b30662..4b850d7 100644
--- a/completions/_dust
+++ b/completions/_dust
@@ -31,6 +31,8 @@ _dust() {
 '(-t --file_types)*--filter=[Only include filepaths matching this regex. For png files type\: -e "\\.png\$" ]: : ' \
 '-w+[Specify width of output overriding the auto detection of terminal width]: : ' \
 '--terminal_width=[Specify width of output overriding the auto detection of terminal width]: : ' \
+'-o+[Changes output display size. si will print sizes in powers of 1000. b/bytes kb kib mb mib gb gib will print the whole tree in that size]: : ' \
+'--output-format=[Changes output display size. si will print sizes in powers of 1000. b/bytes kb kib mb mib gb gib will print the whole tree in that size]: : ' \
 '-S+[Specify memory to use as stack size - use if you see\: '\''fatal runtime error\: stack overflow'\'' (default low memory=1048576, high memory=1073741824)]: : ' \
 '--stack-size=[Specify memory to use as stack size - use if you see\: '\''fatal runtime error\: stack overflow'\'' (default low memory=1048576, high memory=1073741824)]: : ' \
 '-p[Subdirectories will not have their path shortened]' \
@@ -58,16 +60,12 @@ _dust() {
 '--ignore_hidden[Do not display hidden files]' \
 '(-d --depth -D --only-dir)-t[show only these file types]' \
 '(-d --depth -D --only-dir)--file_types[show only these file types]' \
-'-H[print sizes in powers of 1000 (e.g., 1.1G)]' \
-'--si[print sizes in powers of 1000 (e.g., 1.1G)]' \
 '-P[Disable the progress indication.]' \
 '--no-progress[Disable the progress indication.]' \
 '(-F --only-file -t --file_types)-D[Only directories will be displayed.]' \
 '(-F --only-file -t --file_types)--only-dir[Only directories will be displayed.]' \
 '(-D --only-dir)-F[Only files will be displayed. (Finds your largest files)]' \
 '(-D --only-dir)--only-file[Only files will be displayed. (Finds your largest files)]' \
-'-k[display the size of a file or directory in kilobytes]' \
-'--display-kb[display the size of a file or directory in kilobytes]' \
 '-h[Print help]' \
 '--help[Print help]' \
 '-V[Print version]' \
diff --git a/completions/_dust.ps1 b/completions/_dust.ps1
index b8cfb0d..ddfb26f 100644
--- a/completions/_dust.ps1
+++ b/completions/_dust.ps1
@@ -37,6 +37,8 @@ Register-ArgumentCompleter -Native -CommandName 'dust' -ScriptBlock {
             [CompletionResult]::new('--filter', 'filter', [CompletionResultType]::ParameterName, 'Only include filepaths matching this regex. For png files type: -e "\.png$" ')
             [CompletionResult]::new('-w', 'w', [CompletionResultType]::ParameterName, 'Specify width of output overriding the auto detection of terminal width')
             [CompletionResult]::new('--terminal_width', 'terminal_width', [CompletionResultType]::ParameterName, 'Specify width of output overriding the auto detection of terminal width')
+            [CompletionResult]::new('-o', 'o', [CompletionResultType]::ParameterName, 'Changes output display size. si will print sizes in powers of 1000. b/bytes kb kib mb mib gb gib will print the whole tree in that size')
+            [CompletionResult]::new('--output-format', 'output-format', [CompletionResultType]::ParameterName, 'Changes output display size. si will print sizes in powers of 1000. b/bytes kb kib mb mib gb gib will print the whole tree in that size')
             [CompletionResult]::new('-S', 'S ', [CompletionResultType]::ParameterName, 'Specify memory to use as stack size - use if you see: ''fatal runtime error: stack overflow'' (default low memory=1048576, high memory=1073741824)')
             [CompletionResult]::new('--stack-size', 'stack-size', [CompletionResultType]::ParameterName, 'Specify memory to use as stack size - use if you see: ''fatal runtime error: stack overflow'' (default low memory=1048576, high memory=1073741824)')
             [CompletionResult]::new('-p', 'p', [CompletionResultType]::ParameterName, 'Subdirectories will not have their path shortened')
@@ -64,16 +66,12 @@ Register-ArgumentCompleter -Native -CommandName 'dust' -ScriptBlock {
             [CompletionResult]::new('--ignore_hidden', 'ignore_hidden', [CompletionResultType]::ParameterName, 'Do not display hidden files')
             [CompletionResult]::new('-t', 't', [CompletionResultType]::ParameterName, 'show only these file types')
             [CompletionResult]::new('--file_types', 'file_types', [CompletionResultType]::ParameterName, 'show only these file types')
-            [CompletionResult]::new('-H', 'H ', [CompletionResultType]::ParameterName, 'print sizes in powers of 1000 (e.g., 1.1G)')
-            [CompletionResult]::new('--si', 'si', [CompletionResultType]::ParameterName, 'print sizes in powers of 1000 (e.g., 1.1G)')
             [CompletionResult]::new('-P', 'P ', [CompletionResultType]::ParameterName, 'Disable the progress indication.')
             [CompletionResult]::new('--no-progress', 'no-progress', [CompletionResultType]::ParameterName, 'Disable the progress indication.')
             [CompletionResult]::new('-D', 'D ', [CompletionResultType]::ParameterName, 'Only directories will be displayed.')
             [CompletionResult]::new('--only-dir', 'only-dir', [CompletionResultType]::ParameterName, 'Only directories will be displayed.')
             [CompletionResult]::new('-F', 'F ', [CompletionResultType]::ParameterName, 'Only files will be displayed. (Finds your largest files)')
             [CompletionResult]::new('--only-file', 'only-file', [CompletionResultType]::ParameterName, 'Only files will be displayed. (Finds your largest files)')
-            [CompletionResult]::new('-k', 'k', [CompletionResultType]::ParameterName, 'display the size of a file or directory in kilobytes')
-            [CompletionResult]::new('--display-kb', 'display-kb', [CompletionResultType]::ParameterName, 'display the size of a file or directory in kilobytes')
             [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help')
             [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help')
             [CompletionResult]::new('-V', 'V ', [CompletionResultType]::ParameterName, 'Print version')
diff --git a/completions/dust.bash b/completions/dust.bash
index 23f3a32..24c37e0 100644
--- a/completions/dust.bash
+++ b/completions/dust.bash
@@ -19,7 +19,7 @@ _dust() {
 
     case "${cmd}" in
         dust)
-            opts="-d -n -p -X -I -L -x -s -r -c -b -B -z -R -f -i -v -e -t -w -H -P -D -F -k -S -h -V --depth --number-of-lines --full-paths --ignore-directory --ignore-all-in-file --dereference-links --limit-filesystem --apparent-size --reverse --no-colors --no-percent-bars --bars-on-right --min-size --screen-reader --skip-total --filecount --ignore_hidden --invert-filter --filter --file_types --terminal_width --si --no-progress --only-dir --only-file --display-kb --stack-size --help --version [params]..."
+            opts="-d -n -p -X -I -L -x -s -r -c -b -B -z -R -f -i -v -e -t -w -P -D -F -o -S -h -V --depth --number-of-lines --full-paths --ignore-directory --ignore-all-in-file --dereference-links --limit-filesystem --apparent-size --reverse --no-colors --no-percent-bars --bars-on-right --min-size --screen-reader --skip-total --filecount --ignore_hidden --invert-filter --filter --file_types --terminal_width --no-progress --only-dir --only-file --output-format --stack-size --help --version [params]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -89,6 +89,14 @@ _dust() {
                     COMPREPLY=($(compgen -f "${cur}"))
                     return 0
                     ;;
+                --output-format)
+                    COMPREPLY=($(compgen -f "${cur}"))
+                    return 0
+                    ;;
+                -o)
+                    COMPREPLY=($(compgen -f "${cur}"))
+                    return 0
+                    ;;
                 --stack-size)
                     COMPREPLY=($(compgen -f "${cur}"))
                     return 0
diff --git a/completions/dust.elv b/completions/dust.elv
index 915e749..a001ccb 100644
--- a/completions/dust.elv
+++ b/completions/dust.elv
@@ -34,6 +34,8 @@ set edit:completion:arg-completer[dust] = {|@words|
             cand --filter 'Only include filepaths matching this regex. For png files type: -e "\.png$" '
             cand -w 'Specify width of output overriding the auto detection of terminal width'
             cand --terminal_width 'Specify width of output overriding the auto detection of terminal width'
+            cand -o 'Changes output display size. si will print sizes in powers of 1000. b/bytes kb kib mb mib gb gib will print the whole tree in that size'
+            cand --output-format 'Changes output display size. si will print sizes in powers of 1000. b/bytes kb kib mb mib gb gib will print the whole tree in that size'
             cand -S 'Specify memory to use as stack size - use if you see: ''fatal runtime error: stack overflow'' (default low memory=1048576, high memory=1073741824)'
             cand --stack-size 'Specify memory to use as stack size - use if you see: ''fatal runtime error: stack overflow'' (default low memory=1048576, high memory=1073741824)'
             cand -p 'Subdirectories will not have their path shortened'
@@ -61,16 +63,12 @@ set edit:completion:arg-completer[dust] = {|@words|
             cand --ignore_hidden 'Do not display hidden files'
             cand -t 'show only these file types'
             cand --file_types 'show only these file types'
-            cand -H 'print sizes in powers of 1000 (e.g., 1.1G)'
-            cand --si 'print sizes in powers of 1000 (e.g., 1.1G)'
             cand -P 'Disable the progress indication.'
             cand --no-progress 'Disable the progress indication.'
             cand -D 'Only directories will be displayed.'
             cand --only-dir 'Only directories will be displayed.'
             cand -F 'Only files will be displayed. (Finds your largest files)'
             cand --only-file 'Only files will be displayed. (Finds your largest files)'
-            cand -k 'display the size of a file or directory in kilobytes'
-            cand --display-kb 'display the size of a file or directory in kilobytes'
             cand -h 'Print help'
             cand --help 'Print help'
             cand -V 'Print version'
diff --git a/completions/dust.fish b/completions/dust.fish
index a193a90..5dbd22d 100644
--- a/completions/dust.fish
+++ b/completions/dust.fish
@@ -6,6 +6,7 @@ complete -c dust -s z -l min-size -d 'Minimum size file to include in output' -r
 complete -c dust -s v -l invert-filter -d 'Exclude filepaths matching this regex. To ignore png files type: -v "\\.png$" ' -r
 complete -c dust -s e -l filter -d 'Only include filepaths matching this regex. For png files type: -e "\\.png$" ' -r
 complete -c dust -s w -l terminal_width -d 'Specify width of output overriding the auto detection of terminal width' -r
+complete -c dust -s o -l output-format -d 'Changes output display size. si will print sizes in powers of 1000. b/bytes kb kib mb mib gb gib will print the whole tree in that size' -r
 complete -c dust -s S -l stack-size -d 'Specify memory to use as stack size - use if you see: \'fatal runtime error: stack overflow\' (default low memory=1048576, high memory=1073741824)' -r
 complete -c dust -s p -l full-paths -d 'Subdirectories will not have their path shortened'
 complete -c dust -s L -l dereference-links -d 'dereference sym links - Treat sym links as directories and go into them'
@@ -20,10 +21,8 @@ complete -c dust -l skip-total -d 'No total row will be displayed'
 complete -c dust -s f -l filecount -d 'Directory \'size\' is number of child files instead of disk size'
 complete -c dust -s i -l ignore_hidden -d 'Do not display hidden files'
 complete -c dust -s t -l file_types -d 'show only these file types'
-complete -c dust -s H -l si -d 'print sizes in powers of 1000 (e.g., 1.1G)'
 complete -c dust -s P -l no-progress -d 'Disable the progress indication.'
 complete -c dust -s D -l only-dir -d 'Only directories will be displayed.'
 complete -c dust -s F -l only-file -d 'Only files will be displayed. (Finds your largest files)'
-complete -c dust -s k -l display-kb -d 'display the size of a file or directory in kilobytes'
 complete -c dust -s h -l help -d 'Print help'
 complete -c dust -s V -l version -d 'Print version'
diff --git a/man-page/dust.1 b/man-page/dust.1
index a9f77fc..e032029 100644
--- a/man-page/dust.1
+++ b/man-page/dust.1
@@ -1,10 +1,10 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH Dust 1  "Dust 0.9.0"
+.TH Dust 1  "Dust 0.9.0" 
 .SH NAME
 Dust \- Like du but more intuitive
 .SH SYNOPSIS
-\fBDust\fR [\fB\-d\fR|\fB\-\-depth\fR] [\fB\-n\fR|\fB\-\-number\-of\-lines\fR] [\fB\-p\fR|\fB\-\-full\-paths\fR] [\fB\-X\fR|\fB\-\-ignore\-directory\fR] [\fB\-I\fR|\fB\-\-ignore\-all\-in\-file\fR] [\fB\-L\fR|\fB\-\-dereference\-links\fR] [\fB\-x\fR|\fB\-\-limit\-filesystem\fR] [\fB\-s\fR|\fB\-\-apparent\-size\fR] [\fB\-r\fR|\fB\-\-reverse\fR] [\fB\-c\fR|\fB\-\-no\-colors\fR] [\fB\-b\fR|\fB\-\-no\-percent\-bars\fR] [\fB\-B\fR|\fB\-\-bars\-on\-right\fR] [\fB\-z\fR|\fB\-\-min\-size\fR] [\fB\-R\fR|\fB\-\-screen\-reader\fR] [\fB\-\-skip\-total\fR] [\fB\-f\fR|\fB\-\-filecount\fR] [\fB\-i\fR|\fB\-\-ignore_hidden\fR] [\fB\-v\fR|\fB\-\-invert\-filter\fR] [\fB\-e\fR|\fB\-\-filter\fR] [\fB\-t\fR|\fB\-\-file_types\fR] [\fB\-w\fR|\fB\-\-terminal_width\fR] [\fB\-H\fR|\fB\-\-si\fR] [\fB\-P\fR|\fB\-\-no\-progress\fR] [\fB\-D\fR|\fB\-\-only\-dir\fR] [\fB\-F\fR|\fB\-\-only\-file\fR] [\fB\-k\fR|\fB\-\-display\-kb\fR] [\fB\-S\fR|\fB\-\-stack\-size\fR] [\fB\-h\fR|\fB\-\-help\fR] [\fB\-V\fR|\fB\-\-version\fR] [\fIparams\fR]
+\fBdust\fR [\fB\-d\fR|\fB\-\-depth\fR] [\fB\-n\fR|\fB\-\-number\-of\-lines\fR] [\fB\-p\fR|\fB\-\-full\-paths\fR] [\fB\-X\fR|\fB\-\-ignore\-directory\fR] [\fB\-I\fR|\fB\-\-ignore\-all\-in\-file\fR] [\fB\-L\fR|\fB\-\-dereference\-links\fR] [\fB\-x\fR|\fB\-\-limit\-filesystem\fR] [\fB\-s\fR|\fB\-\-apparent\-size\fR] [\fB\-r\fR|\fB\-\-reverse\fR] [\fB\-c\fR|\fB\-\-no\-colors\fR] [\fB\-b\fR|\fB\-\-no\-percent\-bars\fR] [\fB\-B\fR|\fB\-\-bars\-on\-right\fR] [\fB\-z\fR|\fB\-\-min\-size\fR] [\fB\-R\fR|\fB\-\-screen\-reader\fR] [\fB\-\-skip\-total\fR] [\fB\-f\fR|\fB\-\-filecount\fR] [\fB\-i\fR|\fB\-\-ignore_hidden\fR] [\fB\-v\fR|\fB\-\-invert\-filter\fR] [\fB\-e\fR|\fB\-\-filter\fR] [\fB\-t\fR|\fB\-\-file_types\fR] [\fB\-w\fR|\fB\-\-terminal_width\fR] [\fB\-P\fR|\fB\-\-no\-progress\fR] [\fB\-D\fR|\fB\-\-only\-dir\fR] [\fB\-F\fR|\fB\-\-only\-file\fR] [\fB\-o\fR|\fB\-\-output\-format\fR] [\fB\-S\fR|\fB\-\-stack\-size\fR] [\fB\-h\fR|\fB\-\-help\fR] [\fB\-V\fR|\fB\-\-version\fR] [\fIparams\fR] 
 .SH DESCRIPTION
 Like du but more intuitive
 .SH OPTIONS
@@ -61,10 +61,10 @@ Directory \*(Aqsize\*(Aq is number of child files instead of disk size
 Do not display hidden files
 .TP
 \fB\-v\fR, \fB\-\-invert\-filter\fR
-Exclude filepaths matching this regex. To ignore png files type: \-v "\\.png$"
+Exclude filepaths matching this regex. To ignore png files type: \-v "\\.png$" 
 .TP
 \fB\-e\fR, \fB\-\-filter\fR
-Only include filepaths matching this regex. For png files type: \-e "\\.png$"
+Only include filepaths matching this regex. For png files type: \-e "\\.png$" 
 .TP
 \fB\-t\fR, \fB\-\-file_types\fR
 show only these file types
@@ -72,9 +72,6 @@ show only these file types
 \fB\-w\fR, \fB\-\-terminal_width\fR
 Specify width of output overriding the auto detection of terminal width
 .TP
-\fB\-H\fR, \fB\-\-si\fR
-print sizes in powers of 1000 (e.g., 1.1G)
-.TP
 \fB\-P\fR, \fB\-\-no\-progress\fR
 Disable the progress indication.
 .TP
@@ -84,8 +81,8 @@ Only directories will be displayed.
 \fB\-F\fR, \fB\-\-only\-file\fR
 Only files will be displayed. (Finds your largest files)
 .TP
-\fB\-k\fR, \fB\-\-display\-kb\fR
-display the size of a file or directory in kilobytes
+\fB\-o\fR, \fB\-\-output\-format\fR
+Changes output display size. si will print sizes in powers of 1000. b/bytes kb kib mb mib gb gib will print the whole tree in that size
 .TP
 \fB\-S\fR, \fB\-\-stack\-size\fR
 Specify memory to use as stack size \- use if you see: \*(Aqfatal runtime error: stack overflow\*(Aq (default low memory=1048576, high memory=1073741824)
diff --git a/src/cli.rs b/src/cli.rs
index dd5d01b..67a88f7 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -163,13 +163,6 @@ pub fn build_cli() -> Command {
                 .help("Specify width of output overriding the auto detection of terminal width"),
         )
         .arg(
-            Arg::new("iso")
-                .short('H')
-                .long("si")
-                .action(clap::ArgAction::SetTrue)
-                .help("print sizes in powers of 1000 (e.g., 1.1G)")
-        )
-        .arg(
             Arg::new("disable_progress")
                 .short('P')
                 .long("no-progress")
@@ -194,11 +187,11 @@ pub fn build_cli() -> Command {
                 .help("Only files will be displayed. (Finds your largest files)"),
         )
         .arg(
-            Arg::new("display_kb")
-                .short('k')
-                .long("display-kb")
-                .action(clap::ArgAction::SetTrue)
-                .help("display the size of a file or directory in kilobytes"),
+            Arg::new("output_format")
+                .short('o')
+                .long("output-format")
+                .value_parser(value_parser!(String))
+                .help("Changes output display size. si will print sizes in powers of 1000. b/bytes kb kib mb mib gb gib will print the whole tree in that size")
         )
         .arg(
             Arg::new("stack_size")
diff --git a/src/config.rs b/src/config.rs
index 3e058c2..d7fedb6 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -19,14 +19,13 @@ pub struct Config {
     pub skip_total: Option<bool>,
     pub screen_reader: Option<bool>,
     pub ignore_hidden: Option<bool>,
-    pub iso: Option<bool>,
+    pub output_format: Option<String>,
     pub min_size: Option<String>,
     pub only_dir: Option<bool>,
     pub only_file: Option<bool>,
     pub disable_progress: Option<bool>,
     pub depth: Option<usize>,
     pub bars_on_right: Option<bool>,
-    pub display_kb: Option<bool>,
     pub stack_size: Option<usize>,
 }
 
@@ -57,8 +56,16 @@ impl Config {
     pub fn get_no_bars(&self, options: &ArgMatches) -> bool {
         Some(true) == self.no_bars || options.get_flag("no_bars")
     }
-    pub fn get_iso(&self, options: &ArgMatches) -> bool {
-        Some(true) == self.iso || options.get_flag("iso")
+    pub fn get_output_format(&self, options: &ArgMatches) -> String {
+        let out_fmt = options.get_one::<String>("output_format");
+        (match out_fmt {
+            None => match &self.output_format {
+                None => "".to_string(),
+                Some(x) => x.to_string(),
+            },
+            Some(x) => x.into(),
+        })
+        .to_lowercase()
     }
     pub fn get_skip_total(&self, options: &ArgMatches) -> bool {
         Some(true) == self.skip_total || options.get_flag("skip_total")
@@ -73,17 +80,17 @@ impl Config {
 
         self.depth.unwrap_or(usize::MAX)
     }
-    pub fn get_min_size(&self, options: &ArgMatches, iso: bool) -> Option<usize> {
+    pub fn get_min_size(&self, options: &ArgMatches, output_format: &str) -> Option<usize> {
         let size_from_param = options.get_one::<String>("min_size");
-        self._get_min_size(size_from_param, iso)
+        self._get_min_size(size_from_param, output_format)
     }
-    fn _get_min_size(&self, min_size: Option<&String>, iso: bool) -> Option<usize> {
-        let size_from_param = min_size.and_then(|a| convert_min_size(a, iso));
+    fn _get_min_size(&self, min_size: Option<&String>, output_format: &str) -> Option<usize> {
+        let size_from_param = min_size.and_then(|a| convert_min_size(a, output_format));
 
         if size_from_param.is_none() {
             self.min_size
                 .as_ref()
-                .and_then(|a| convert_min_size(a.as_ref(), iso))
+                .and_then(|a| convert_min_size(a.as_ref(), output_format))
         } else {
             size_from_param
         }
@@ -105,12 +112,9 @@ impl Config {
             from_cmd_line.copied()
         }
     }
-    pub fn get_display_kb(&self, options: &ArgMatches) -> bool {
-        Some(true) == self.display_kb || options.get_flag("display_kb")
-    }
 }
 
-fn convert_min_size(input: &str, iso: bool) -> Option<usize> {
+fn convert_min_size(input: &str, output_format: &str) -> Option<usize> {
     let chars_as_vec: Vec<char> = input.chars().collect();
     match chars_as_vec.split_last() {
         Some((last, start)) => {
@@ -120,7 +124,8 @@ fn convert_min_size(input: &str, iso: bool) -> Option<usize> {
                 if Some(*u) == last.to_uppercase().next() {
                     return match starts.parse::<usize>() {
                         Ok(pure) => {
-                            let num: usize = if iso { 1000 } else { 1024 };
+                            //fix
+                            let num: usize = if output_format.eq("si") { 1000 } else { 1024 };
                             let marker = pure * num.pow((i + 1) as u32);
                             Some(marker)
                         }
@@ -173,13 +178,13 @@ mod tests {
 
     #[test]
     fn test_conversion() {
-        assert_eq!(convert_min_size("55", false), Some(55));
-        assert_eq!(convert_min_size("12344321", false), Some(12344321));
-        assert_eq!(convert_min_size("95RUBBISH", false), None);
-        assert_eq!(convert_min_size("10K", false), Some(10 * 1024));
-        assert_eq!(convert_min_size("10M", false), Some(10 * 1024usize.pow(2)));
-        assert_eq!(convert_min_size("10M", true), Some(10 * 1000usize.pow(2)));
-        assert_eq!(convert_min_size("2G", false), Some(2 * 1024usize.pow(3)));
+        assert_eq!(convert_min_size("55", ""), Some(55));
+        assert_eq!(convert_min_size("12344321", ""), Some(12344321));
+        assert_eq!(convert_min_size("95RUBBISH", ""), None);
+        assert_eq!(convert_min_size("10K", ""), Some(10 * 1024));
+        assert_eq!(convert_min_size("10M", ""), Some(10 * 1024usize.pow(2)));
+        assert_eq!(convert_min_size("10M", "si"), Some(10 * 1000usize.pow(2)));
+        assert_eq!(convert_min_size("2G", ""), Some(2 * 1024usize.pow(3)));
     }
 
     #[test]
@@ -188,11 +193,11 @@ mod tests {
             min_size: Some("1K".to_owned()),
             ..Default::default()
         };
-        assert_eq!(c._get_min_size(None, false), Some(1024));
-        assert_eq!(c._get_min_size(Some(&"2K".into()), false), Some(2048));
+        assert_eq!(c._get_min_size(None, ""), Some(1024));
+        assert_eq!(c._get_min_size(Some(&"2K".into()), ""), Some(2048));
 
-        assert_eq!(c._get_min_size(None, true), Some(1000));
-        assert_eq!(c._get_min_size(Some(&"2K".into()), true), Some(2000));
+        assert_eq!(c._get_min_size(None, "si"), Some(1000));
+        assert_eq!(c._get_min_size(Some(&"2K".into()), "si"), Some(2000));
     }
 
     #[test]
diff --git a/src/display.rs b/src/display.rs
index 68bbb4d..9f96741 100644
--- a/src/display.rs
+++ b/src/display.rs
@@ -23,9 +23,8 @@ pub struct InitialDisplayData {
     pub colors_on: bool,
     pub by_filecount: bool,
     pub is_screen_reader: bool,
-    pub iso: bool,
+    pub output_format: String,
     pub bars_on_right: bool,
-    pub display_kb: bool,
 }
 
 pub struct DisplayData {
@@ -130,7 +129,6 @@ pub fn draw_it(
     terminal_width: usize,
     root_node: &DisplayNode,
     skip_total: bool,
-    display_kb: bool,
 ) {
     let biggest = match skip_total {
         false => root_node,
@@ -144,7 +142,7 @@ pub fn draw_it(
         let max_size = biggest.size;
         max_size.separate_with_commas().chars().count()
     } else {
-        find_biggest_size_str(root_node, idd.iso, display_kb)
+        find_biggest_size_str(root_node, &idd.output_format)
     };
 
     assert!(
@@ -192,12 +190,12 @@ pub fn draw_it(
     }
 }
 
-fn find_biggest_size_str(node: &DisplayNode, iso: bool, display_kb: bool) -> usize {
-    let mut mx = human_readable_number(node.size, iso, display_kb)
+fn find_biggest_size_str(node: &DisplayNode, output_format: &str) -> usize {
+    let mut mx = human_readable_number(node.size, output_format)
         .chars()
         .count();
     for n in node.children.iter() {
-        mx = max(mx, find_biggest_size_str(n, iso, display_kb));
+        mx = max(mx, find_biggest_size_str(n, output_format));
     }
     mx
 }
@@ -379,11 +377,7 @@ fn get_pretty_size(node: &DisplayNode, is_biggest: bool, display_data: &DisplayD
     let output = if display_data.initial.by_filecount {
         node.size.separate_with_commas()
     } else {
-        human_readable_number(
-            node.size,
-            display_data.initial.iso,
-            display_data.initial.display_kb,
-        )
+        human_readable_number(node.size, &display_data.initial.output_format)
     };
     let spaces_to_add = display_data.num_chars_needed_on_left_most - output.chars().count();
     let output = " ".repeat(spaces_to_add) + output.as_str();
@@ -415,11 +409,20 @@ fn get_pretty_name(
     }
 }
 
-pub fn human_readable_number(size: u64, iso: bool, display_kb: bool) -> String {
-    let num: u64 = if iso { 1000 } else { 1024 };
-    if display_kb {
-        return format!("{:.1}{}", (size as f32 / num as f32), 'K');
+pub fn human_readable_number(size: u64, output_str: &str) -> String {
+    let is_si = output_str.contains('i'); // si, KiB, MiB, etc
+    let num: u64 = if is_si { 1000 } else { 1024 };
+
+    if output_str.starts_with('b') {
+        return format!("{}B", size);
+    }
+    for (i, u) in UNITS.iter().enumerate() {
+        if output_str.starts_with((*u).to_ascii_lowercase()) {
+            let marker = num.pow((UNITS.len() - i) as u32);
+            return format!("{}{}", (size / marker), u);
+        }
     }
+
     for (i, u) in UNITS.iter().enumerate() {
         let marker = num.pow((UNITS.len() - i) as u32);
         if size >= marker {
@@ -447,9 +450,8 @@ mod tests {
             colors_on: false,
             by_filecount: false,
             is_screen_reader: false,
-            iso: false,
+            output_format: "".into(),
             bars_on_right: false,
-            display_kb: false,
         };
         DisplayData {
             initial,
@@ -515,25 +517,37 @@ mod tests {
 
     #[test]
     fn test_human_readable_number() {
-        assert_eq!(human_readable_number(1, false, false), "1B");
-        assert_eq!(human_readable_number(956, false, false), "956B");
-        assert_eq!(human_readable_number(1004, false, false), "1004B");
-        assert_eq!(human_readable_number(1024, false, false), "1.0K");
-        assert_eq!(human_readable_number(1536, false, false), "1.5K");
-        assert_eq!(human_readable_number(1024 * 512, false, false), "512K");
-        assert_eq!(human_readable_number(1024 * 1024, false, false), "1.0M");
-        assert_eq!(
-            human_readable_number(1024 * 1024 * 1024 - 1, false, false),
-            "1023M"
-        );
-        assert_eq!(
-            human_readable_number(1024 * 1024 * 1024 * 20, false, false),
-            "20G"
-        );
-        assert_eq!(
-            human_readable_number(1024 * 1024 * 1024 * 1024, false, false),
-            "1.0T"
-        );
+        assert_eq!(human_readable_number(1, ""), "1B");
+        assert_eq!(human_readable_number(956, ""), "956B");
+        assert_eq!(human_readable_number(1004, ""), "1004B");
+        assert_eq!(human_readable_number(1024, ""), "1.0K");
+        assert_eq!(human_readable_number(1536, ""), "1.5K");
+        assert_eq!(human_readable_number(1024 * 512, ""), "512K");
+        assert_eq!(human_readable_number(1024 * 1024, ""), "1.0M");
+        assert_eq!(human_readable_number(1024 * 1024 * 1024 - 1, ""), "1023M");
+        assert_eq!(human_readable_number(1024 * 1024 * 1024 * 20, ""), "20G");
+        assert_eq!(human_readable_number(1024 * 1024 * 1024 * 1024, ""), "1.0T");
+    }
+
+    #[test]
+    fn test_human_readable_number_si() {
+        assert_eq!(human_readable_number(1024 * 100, ""), "100K");
+        assert_eq!(human_readable_number(1024 * 100, "si"), "102K");
+    }
+
+    #[test]
+    fn test_human_readable_number_kb() {
+        let hrn = human_readable_number;
+        assert_eq!(hrn(1023, "b"), "1023B");
+        assert_eq!(hrn(1000 * 1000, "bytes"), "1000000B");
+        assert_eq!(hrn(1023, "kb"), "0K");
+        assert_eq!(hrn(1023, "kib"), "1K");
+        assert_eq!(hrn(1024, "kb"), "1K");
+        assert_eq!(hrn(1024 * 512, "kb"), "512K");
+        assert_eq!(hrn(1024 * 1024, "kb"), "1024K");
+        assert_eq!(hrn(1024 * 1000 * 1000 * 20, "kb"), "20000000K");
+        assert_eq!(hrn(1024 * 1024 * 1000 * 20, "mb"), "20000M");
+        assert_eq!(hrn(1024 * 1024 * 1024 * 20, "gb"), "20G");
     }
 
     #[cfg(test)]
@@ -589,16 +603,4 @@ mod tests {
         let bar = dd.generate_bar(&n, 5);
         assert_eq!(bar, "████▓▓▓▓▓▓▓▓▓");
     }
-    #[test]
-    fn test_human_readable_number_kb() {
-        assert_eq!(human_readable_number(1, false, true), "0.0K");
-        assert_eq!(human_readable_number(1024, false, true), "1.0K");
-        assert_eq!(human_readable_number(1536, false, true), "1.5K");
-        assert_eq!(human_readable_number(1024 * 512, false, true), "512.0K");
-        assert_eq!(human_readable_number(1024 * 1024, false, true), "1024.0K");
-        assert_eq!(
-            human_readable_number(1024 * 1000 * 1000 * 20, false, true),
-            "20000000.0K"
-        );
-    }
 }
diff --git a/src/main.rs b/src/main.rs
index ac93139..ec024e8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -178,15 +178,13 @@ fn main() {
         .flat_map(|x| simplified_dirs.iter().map(move |d| d.join(&x)))
         .collect();
 
-    let iso = config.get_iso(&options);
-
-    let display_kb = config.get_display_kb(&options);
+    let output_format = config.get_output_format(&options);
 
     let ignore_hidden = config.get_ignore_hidden(&options);
 
     let mut indicator = PIndicator::build_me();
     if !config.get_disable_progress(&options) {
-        indicator.spawn(iso, display_kb);
+        indicator.spawn(output_format.clone())
     }
 
     let walk_data = WalkData {
@@ -210,7 +208,7 @@ fn main() {
         true => get_all_file_types(&top_level_nodes, number_of_lines),
         false => {
             let agg_data = AggregateData {
-                min_size: config.get_min_size(&options, iso),
+                min_size: config.get_min_size(&options, &output_format),
                 only_dir: config.get_only_dir(&options),
                 only_file: config.get_only_file(&options),
                 number_of_lines,
@@ -254,10 +252,9 @@ fn main() {
             is_reversed: !config.get_reverse(&options),
             colors_on: !no_colors,
             by_filecount,
-            iso,
             is_screen_reader: config.get_screen_reader(&options),
+            output_format,
             bars_on_right: config.get_bars_on_right(&options),
-            display_kb,
         };
         draw_it(
             idd,
@@ -265,7 +262,6 @@ fn main() {
             terminal_width,
             &root_node,
             config.get_skip_total(&options),
-            display_kb,
         )
     }
 }
diff --git a/src/progress.rs b/src/progress.rs
index afeee04..6d5b7be 100644
--- a/src/progress.rs
+++ b/src/progress.rs
@@ -77,26 +77,16 @@ pub struct RuntimeErrors {
 
 /* -------------------------------------------------------------------------- */
 
-fn format_preparing_str(
-    prog_char: char,
-    data: &PAtomicInfo,
-    is_iso: bool,
-    is_display_kb: bool,
-) -> String {
+fn format_preparing_str(prog_char: char, data: &PAtomicInfo, output_display: &str) -> String {
     let path_in = data.current_path.get();
-    let size = human_readable_number(data.total_file_size.load(ORDERING), is_iso, is_display_kb);
+    let size = human_readable_number(data.total_file_size.load(ORDERING), output_display);
     format!("Preparing: {path_in} {size} ... {prog_char}")
 }
 
-fn format_indexing_str(
-    prog_char: char,
-    data: &PAtomicInfo,
-    is_iso: bool,
-    display_kb: bool,
-) -> String {
+fn format_indexing_str(prog_char: char, data: &PAtomicInfo, output_display: &str) -> String {
     let path_in = data.current_path.get();
     let file_count = data.num_files.load(ORDERING);
-    let size = human_readable_number(data.total_file_size.load(ORDERING), is_iso, display_kb);
+    let size = human_readable_number(data.total_file_size.load(ORDERING), output_display);
     let file_str = format!("{file_count} files, {size}");
     format!("Indexing: {path_in} {file_str} ... {prog_char}")
 }
@@ -116,7 +106,7 @@ impl PIndicator {
         }
     }
 
-    pub fn spawn(&mut self, is_iso: bool, display_kb: bool) {
+    pub fn spawn(&mut self, output_display: String) {
         let data = self.data.clone();
         let (stop_handler, receiver) = mpsc::channel::<()>();
 
@@ -135,12 +125,8 @@ impl PIndicator {
                 let prog_char = PROGRESS_CHARS[progress_char_i];
 
                 msg = match data.state.load(ORDERING) {
-                    Operation::INDEXING => {
-                        format_indexing_str(prog_char, &data, is_iso, display_kb)
-                    }
-                    Operation::PREPARING => {
-                        format_preparing_str(prog_char, &data, is_iso, display_kb)
-                    }
+                    Operation::INDEXING => format_indexing_str(prog_char, &data, &output_display),
+                    Operation::PREPARING => format_preparing_str(prog_char, &data, &output_display),
                     _ => panic!("Unknown State"),
                 };