module ActiveSupport::NumberHelper

number_to_human(0.34, units: :distance) # => "34 centimeters"
number_to_human(1, units: :distance) # => "1 meter"
number_to_human(343, units: :distance, precision: 1) # => "300 meters"
number_to_human(54393498000, units: :distance) # => "54.4 gazillion-distance"
number_to_human(54393498, units: :distance) # => "54400 kilometers"
number_to_human(543934, units: :distance) # => "544 kilometers"

Then you could do:

billion: "gazillion-distance"
other: "kilometers"
one: "kilometer"
thousand:
other: "meters"
one: "meter"
unit:
other: "centimeters"
one: "centimeter"
centi:
distance:

If in your I18n locale you have:

number_to_human(500000, units: { unit: 'ml', thousand: 'lt' }) # => "500 lt"
You can also use your own custom unit quantifiers:

==== Custom Unit Quantifiers

number_to_human(12.00001, strip_insignificant_zeros: false) # => "12.0"
number_to_human(12.00001) # => "12"

+false+ to change that):
out by default (set :strip_insignificant_zeros to
Non-significant zeros after the decimal separator are stripped

number_to_human(12345012345, significant: false) # => "12.345 Billion"
number_to_human(500000000, precision: 5) # => "500 Million"

significant: false) # => "1,2 Million"
separator: ',',
number_to_human(1234567, precision: 1,
significant: false) # => "1.2346 Million"
number_to_human(1234567, precision: 4,
, round_mode: :down) # => "480 Thousand"
number_to_human(489939, precision: 2
number_to_human(489939, precision: 4) # => "489.9 Thousand"
number_to_human(489939, precision: 2) # => "490 Thousand"
number_to_human(1234567890123456789) # => "1230 Quadrillion"
number_to_human(1234567890123456) # => "1.23 Quadrillion"
number_to_human(1234567890123) # => "1.23 Trillion"
number_to_human(1234567890) # => "1.23 Billion"
number_to_human(1234567) # => "1.23 Million"
number_to_human(12345) # => "12.3 Thousand"
number_to_human(1234) # => "1.23 Thousand"
number_to_human(123) # => "123"

==== Examples

* %n - The number
* %u - The quantifier (ex.: 'thousand')
(defaults to "%n %u"). The field types are:
* :format - Sets the format of the output string
:pico, :femto
:mili, :micro, :nano,
* *fractionals*: :deci, :centi,
:quadrillion
:billion, :trillion,
:hundred, :thousand, :million,
* *integers*: :unit, :ten,
might have the following keys:
string containing an i18n scope where to find this hash. It
* :units - A Hash of unit quantifier names. Or a
+true+)
insignificant zeros after the decimal separator (defaults to
* :strip_insignificant_zeros - If +true+ removes
to "").
* :delimiter - Sets the thousands delimiter (defaults
fractional and integer digits (defaults to ".").
* :separator - Sets the separator between the
digits (defaults to +true+)
of significant_digits. If +false+, the number of fractional
* :significant - If +true+, precision will be the number
(defaults to :default. See BigDecimal::mode)
* :round_mode - Determine how rounding is performed
(defaults to 3).
* :precision - Sets the precision of the number
(defaults to current locale).
* :locale - Sets the locale to be used for formatting

==== Options

(centi, deci, mili, etc).
define a wide range of unit quantifiers, even fractional ones
kilometers", 0.150 becomes "150 milliliters", etc). You may
to use other decimal units (e.g.: 1500 becomes "1.5
You can also define your own unit-quantifier names if you want

size.
See number_to_human_size if you want to print a file

(and too hard to read).
Billion"). This is useful for numbers that can get very large
is more readable by humans (e.g.: 1200000000 becomes "1.2
Pretty prints (formats and approximates) a number in a way it

def number_to_human(number, options = {})
  NumberToHumanConverter.convert(number, options)
end