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CSS Math Functions


The CSS math functions allow mathematical expressions to be used as property values. Here, we will explain the calc(), max() and min() functions.


The calc() Function

The calc() function performs a calculation to be used as the property value.

CSS Syntax

calc(expression)
Value Description
expression Required. A mathematical expression. The result will be used as the value.
The following operators can be used: + - * /

Let us look at an example:

Example

Use calc() to calculate the width of a <div> element:

#div1 {
  position: absolute;
  left: 50px;
  width: calc(100% - 100px);
  border: 1px solid black;
  background-color: yellow;
  padding: 5px;
}
Try it Yourself »

The max() Function

The max() function uses the largest value, from a comma-separated list of values, as the property value.

CSS Syntax

max(value1, value2, ...)
Value Description
value1, value2, ... Required. A list of comma-separated values - where the largest value is chosen

Let us look at an example:

Example

Use max() to set the width of #div1 to whichever value is largest, 50% or 300px:

#div1 {
  background-color: yellow;
  height: 100px;
  width: max(50%, 300px);
}
Try it Yourself »


The min() Function

The min() function uses the smallest value, from a comma-separated list of values, as the property value.

CSS Syntax

min(value1, value2, ...)
Value Description
value1, value2, ... Required. A list of comma-separated values - where the smallest value is chosen

Let us look at an example:

Example

Use min() to set the width of #div1 to whichever value is smallest, 50% or 300px:

#div1 {
  background-color: yellow;
  height: 100px;
  width: min(50%, 300px);
}
Try it Yourself »

All CSS Math Functions

Function Description
calc() Allows you to perform calculations to determine CSS property values
max() Uses the largest value, from a comma-separated list of values, as the property value
min() Uses the smallest value, from a comma-separated list of values, as the property value