

calc Redirect 1

This is an experimental technology


The calc() CSS function can be used anywhere a <length>, <frequency>, <angle>, <time>, <number>, or <integer> is required. With calc(), you can perform calculations to determine CSS property values.

It is possible to use calc() inside another calc().




A mathematical expression, the result of which is used as the value.


The expression can be any simple expression combining the following operators:

Multiplication. At least one of the arguments must be a <number>.
Division. The right-hand side must be a <number>.

The operands in the expression may be any length syntax value. You can use different units for each value in your expression, if you wish. You may also use parentheses to establish computation order when needed.

Note: Division by zero results in an error being generated by the HTML parser.
Note: The + and - operators must always be surrounded by whitespace. The operand of calc(50% -8px) for instance will be parsed as a percentage followed by a negative length, an invalid expression, while the operand of calc(50% - 8px) is a percentage followed by a minus sign and a length. Even further, calc(8px + -50%) is treated as a length followed by a plus sign and a negative percentage.
The * and / operators do not require whitespace, but adding it for consistency is allowed, and recommended.


Positioning an object on screen with a margin

calc() makes it easy to position an object with a set margin. In this example, the CSS creates a banner that stretches across the window, with a 40-pixel gap between both sides of the banner and the edges of the window:

.banner {
  position: absolute;
  left: 40px;
  width: 90%;               /* fallback for browsers without support for calc() */
  width: calc(100% - 80px);
  border: solid black 1px;
  box-shadow: 1px 2px;
  background-color: yellow;
  padding: 6px;
  text-align: center;
<div class="banner">This is a banner!</div>

Automatically sizing form fields to fit their container

Another use case for calc() is to help ensure that form fields fit in the available space, without extruding past the edge of their container, while maintaining an appropriate margin.

Let's look at some CSS:

input {
  padding: 2px;
  display: block;
  width: 98%;               /* fallback for browsers without support for calc() */
  width: calc(100% - 1em);

#formbox {
  width: 130px;             /* fallback for browsers without support for calc() */
  width: calc(100% / 6);
  border: 1px solid black;
  padding: 4px;

Here, the form itself is established to use 1/6 of the available window width. Then, to ensure that input fields retain an appropriate size, we use calc() again to establish that they should be the width of their container minus 1em. Then, the following HTML makes use of this CSS:

  <div id="formbox">
  <label>Type something:</label>
  <input type="text">


Specification Status Comment
CSS Values and Units Module Level 3 Candidate Recommendation  

Browser compatibility

Basic support 19 (WebKit 536.3) -webkit
4.0 (2) -moz
16 (16)
9 - 6 -webkit (buggy)
On gradients' color stops 19 (WebKit 536.3) -webkit
27 (maybe 26)
19 (19) 9 - 6 -webkit (buggy)
Basic support <= 2.3.6 not supported 4.0 (2) -moz
16.0 (16)
? ? <= IOs 6.1.3 not supported
On gradients' color stops ? 19.0 (19) ? ? ?

See also

Document Tags and Contributors

Last updated by: Sheppy,