sass-site/source/documentation/functions/math.html.erb

---
title: Number Functions
---

<% function 'abs($number)', returns: 'number' do %>
  Returns the [absolute value][] of `$number`. If `$number` is negative, this
  returns `-$number`, and if `$number` is positive, it returns `$number` as-is.

  [absolute value]: https://en.wikipedia.org/wiki/Absolute_value

  <% example(autogen_css: false) do %>
    @debug abs(10px); // 10px
    @debug abs(-10px); // 10px
    ===
    @debug abs(10px) // 10px
    @debug abs(-10px) // 10px
  <% end %>
<% end %>


<% function 'ceil($number)', returns: 'number' do %>
  Rounds `$number` up to the next highest whole number.

  <% example(autogen_css: false) do %>
    @debug ceil(4); // 4
    @debug ceil(4.2); // 5
    @debug ceil(4.9); // 5
    ===
    @debug ceil(4)  // 4
    @debug ceil(4.2)  // 5
    @debug ceil(4.9)  // 5
  <% end %>
<% end %>


<% function 'comparable($number1, $number2)', returns: 'boolean' do %>
  Returns whether `$number1` and `$number2` have compatible units.

  If this returns `true`, `$number1` and `$number2` can safely be [added][],
  [subtracted][], and [compared][]. Otherwise, doing so will produce errors.

  [added]: ../operators/numeric
  [subtracted]: ../operators/numeric
  [compared]: ../operators/relational

  <% example(autogen_css: false) do %>
    @debug comparable(2px, 1px); // true
    @debug comparable(100px, 3em); // false
    @debug comparable(10cm, 3mm); // true
    ===
    @debug comparable(2px, 1px)  // true
    @debug comparable(100px, 3em)  // false
    @debug comparable(10cm, 3mm)  // true
  <% end %>
<% done %>


<% function 'floor($number)', returns: 'number' do %>
  Rounds `$number` down to the next lowest whole number.

  <% example(autogen_css: false) do %>
    @debug floor(4); // 4
    @debug floor(4.2); // 4
    @debug floor(4.9); // 4
    ===
    @debug floor(4)  // 4
    @debug floor(4.2)  // 4
    @debug floor(4.9)  // 4
  <% end %>
<% end %>


<% function 'max($number...)', returns: 'number' do %>
  Returns the highest of one or more numbers. A list of numbers can be passed
  [using `...`][].

  [using `...`]: ../at-rules/function#passing-arbitrary-arguments

  <% example(autogen_css: false) do %>
    @debug max(1px, 4px); // 4px

    $widths: 50px, 30px, 100px;
    @debug max($widths...); // 100px
    ===
    @debug max(1px, 4px)  // 4px

    $widths: 50px, 30px, 100px 
    @debug max($widths...)  // 100px
  <% end %>
<% end %>


<% function 'min($number...)', returns: 'number' do %>
  Returns the lowest of one or more numbers. A list of numbers can be passed
  [using `...`][].

  [using `...`]: ../at-rules/function#passing-arbitrary-arguments

  <% example(autogen_css: false) do %>
    @debug min(1px, 4px); // 1px

    $widths: 50px, 30px, 100px;
    @debug min($widths...); // 30px
    ===
    @debug min(1px, 4px)  // 1px

    $widths: 50px, 30px, 100px 
    @debug min($widths...)  // 30px
  <% end %>
<% end %>


<% function 'percentage($number)', returns: 'number' do %>
  Converts a unitless `$number` (usually a decimal between 0 and 1) to a
  percentage.

  <% fun_fact do %>
    This function is identical to `$number * 100%`.
  <% end %>

  <% example(autogen_css: false) do %>
    @debug percentage(0.2); // 20%
    @debug percentage(100px / 50px); // 200%
    ===
    @debug percentage(0.2)  // 20%
    @debug percentage(100px / 50px)  // 200%
  <% end %>
<% end %>


<% function 'random($limit: null)', returns: 'number' do %>
  If `$limit` is [`null`][], returns a random decimal number between 0 and 1.

  [`null`]: ../values/null

  <% example(autogen_css: false) do %>
    @debug random(); // 0.2821251858
    @debug random(); // 0.6221325814
    ===
    @debug random()  // 0.2821251858
    @debug random()  // 0.6221325814
  <% end %>

  * * *

  If `$limit` is a number greater than or equal to 1, returns a random whole
  number between 1 and `$limit`.

  <% example(autogen_css: false) do %>
    @debug random(10); // 4
    @debug random(10000); // 5373
    ===
    @debug random(10)  // 4
    @debug random(10000)  // 5373
  <% end %>
<% end %>


<% function 'round($number)', returns: 'number' do %>
  Rounds `$number` to the nearest whole number.

  <% example(autogen_css: false) do %>
    @debug round(4); // 4
    @debug round(4.2); // 4
    @debug round(4.9); // 5
    ===
    @debug round(4)  // 4
    @debug round(4.2)  // 4
    @debug round(4.9)  // 5
  <% end %>
<% end %>


<% function 'unit($number)', returns: 'quoted string' do %>
  Returns a string representation of `$number`'s units.

  <% heads_up do %>
    This function is intended for debugging; its output format is not guaranteed
    to be consistent across Sass versions or implementations.
  <% end %>

  <% example(autogen_css: false) do %>
    @debug unit(100); // ""
    @debug unit(100px); // "px"
    @debug unit(5px * 10px); // "px*px"
    @debug unit(5px / 1s); // "px/s"
    ===
    @debug unit(100)  // ""
    @debug unit(100px)  // "px"
    @debug unit(5px * 10px)  // "px*px"
    @debug unit(5px / 1s)  // "px/s"
  <% end %>
<% end %>

<% function 'unitless($number)', returns: 'boolean' do %>
  Returns whether `$number` has no units.

  <% example(autogen_css: false) do %>
    @debug unitless(100); // true
    @debug unitless(100px); // false
    ===
    @debug unitless(100)  // true
    @debug unitless(100px)  // false
  <% end %>  
<% end %>