Convert numbers from/to human-readable strings


Convert 1.5K (SI Units) to 1500

$ numfmt --from=[si] [1.5K]

Convert 5th field (1-indexed) to IEC Units without converting header

$ ls -l | numfmt --header=[1] --field=[5] --to=[iec]

Convert to IEC units, pad with 5 characters, left aligned

$ du -s * | numfmt --to=[iec] --format="[%-5f]"


numfmt [ OPTION ]...[ NUMBER ]...


Reformat NUMBER(s), or the numbers from standard input if none are specified.

Mandatory arguments to long options are mandatory for short options too.

--debug print warnings about invalid input

-d , --delimiter = X use X instead of whitespace for field delimiter

--field = FIELDS replace the numbers in these input fields (default=1) see FIELDS below

--format = FORMAT use printf style floating -point FORMAT; see FORMAT below for details

--from = UNIT auto -scale input numbers to UNITs; default is 'none'; see UNIT below

--from -unit = N specify the input unit size (instead of the default 1)

--grouping use locale -defined grouping of digits, e.g. 1,000,000 (which means it has no effect in the C/POSIX locale)

--header [= N ] print (without converting) the first N header lines; N defaults to 1 if not specified

--invalid = MODE failure mode for invalid numbers: MODE can be: abort (default), fail, warn, ignore

--padding = N pad the output to N characters; positive N will right -align; negative N will left -align; padding is ignored if the output is wider than N; the default is to automatically pad if a whitespace is found

--round = METHOD use METHOD for rounding when scaling; METHOD can be: up, down, from -zero (default), towards -zero, nearest

--suffix = SUFFIX add SUFFIX to output numbers, and accept optional SUFFIX in input numbers

--to = UNIT auto -scale output numbers to UNITs; see UNIT below

--to -unit = N the output unit size (instead of the default 1)

-z , --zero -terminated line delimiter is NUL, not newline

--help display this help and exit

--version output version information and exit

UNIT options:

none no auto -scaling is done; suffixes will trigger an error

auto accept optional single/two letter suffix:

1K = 1000, 1Ki = 1024, 1M = 1000000, 1Mi = 1048576,

si accept optional single letter suffix:

1K = 1000, 1M = 1000000, ...

iec accept optional single letter suffix:

1K = 1024, 1M = 1048576, ...

iec -i accept optional two -letter suffix:

1Ki = 1024, 1Mi = 1048576, ...

FIELDS supports cut(1) style field ranges:

N N'th field, counted from 1

N - from N'th field, to end of line

N -M from N'th to M'th field (inclusive)

-M from first to M'th field (inclusive)

- all fields

Multiple fields/ranges can be separated with commas

FORMAT must be suitable for printing one floating -point argument '%f'. Optional quote (%'f) will enable --grouping (if supported by current locale). Optional width value (%10f) will pad output. Optional zero (%010f) width will zero pad the number. Optional negative values (% -10f) will left align. Optional precision (%.1f) will override the input determined precision.

Exit status is 0 if all input numbers were successfully converted. By default, numfmt will stop at the first conversion error with exit status 2. With --invalid= 'fail'a warning is printed for each conversion error and the exit status is 2. With --invalid= 'warn'each conversion error is diagnosed, but the exit status is 0. With --invalid= 'ignore'conversion errors are not diagnosed and the exit status is 0.


CW$numfmt --to=si 1000

-> "1.0K"

CW$numfmt --to=iec 2048

-> "2.0K"

CW$numfmt --to=iec-i 4096

-> "4.0Ki"

CW$echo 1K | numfmt --from=si

-> "1000"

CW$echo 1K | numfmt --from=iec

-> "1024"

CW$df -B1 | numfmt --header --field 2-4 --to=si
CW$ls -l | numfmt --header --field 5 --to=iec
CW$ls -lh | numfmt --header --field 5 --from=iec --padding=10
CW$ls -lh | numfmt --header --field 5 --from=iec --format %10f


GNU coreutils online help: <>
Report any translation bugs to <>


Copyright 2019 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.


Full documentation <> or available locally via: info numfmt invocation


Written by Assaf Gordon.

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