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Math.sqrt(value) Last updated: 16. May 2026

Calculates and returns the square root of a number.

See also: Math.pow Math.PI

Parameters

Name Type Description
value number

Number to calculate square root of.

Returns

A number, the square root of specified value.

Example

Code example (JS)

JS is normal JavaScript either running in the browser or on the Docly™ server. 
write(Math.sqrt(64));
write("\n");
/* Expected output: 8 */

write(Math.sqrt(256));
write("\n");
/* Expected output: 16 */

write(Math.sqrt(1000));
/* Expected output: 31.622776601683793 */

Output

The JS code above produces the output shown below: 
8
16
31.622776601683793