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Remainder (%)

The remainder operator (%) returns the remainder left over when one operand is divided by a second operand. It always takes the sign of the dividend.

Note that while in most languages, ‘%’ is a remainder operator, in some (e.g. Python, Perl) it is a modulo operator. For two values of the same sign, the two are equivalent, but when the dividend and divisor are of different signs, they give different results. To obtain a modulo in JavaScript, in place of a % n, use ((a % n ) + n ) % n.

Syntax

x % y

Examples

Remainder with positive dividend

 13 % 5  //  3
 1 % -2 //  1
 1 % 2  //  1
 2 % 3  //  2
5.5 % 2 // 1.5

Remainder with negative dividend

-13 % 5 // -3
-1 % 2  // -1
-4 % 2  // -0

Remainder with NaN

NaN % 2 // NaN

Remainder with Infinity

Infinity % 2 // NaN
Infinity % 0 // NaN
Infinity % Infinity // NaN

Specifications

Browser compatibility

Desktop Mobile Server
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet Deno Node.js
Remainder
1
12
1
3
3
1
1
18
4
10.1
1
1.0
1.0
0.10.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Remainder