Number.prototype.toFixed()

Summary

The toFixed() method formats a number using fixed-point notation.

Syntax

numObj.toFixed(digits)

Parameter

digits
The number of digits to appear after the decimal point; this may be a value between 0 and 20, inclusive, and implementations may optionally support a larger range of values. If this argument is omitted, it is treated as 0.

Returns

A string representation of number that does not use exponential notation and has exactly digits digits after the decimal place. The number is rounded if necessary, and the fractional part is padded with zeros if necessary so that it has the specified length. If number is greater than 1e+21, this method simply calls Number.prototype.toString() and returns a string in exponential notation.

Throws

RangeError
If digits is too small or too large. Values between 0 and 20, inclusive, will not cause a RangeError. Implementations are allowed to support larger and smaller values as well.
TypeError
If this method is invoked on an object that is not a Number.

Examples

var numObj = 12345.6789;

numObj.toFixed();         // Returns "12346": note rounding, no fractional part

numObj.toFixed(1);        // Returns "12345.7": note rounding

numObj.toFixed(6);        // Returns "12345.678900": note added zeros

(1.23e+20).toFixed(2);    // Returns "123000000000000000000.00"

(1.23e-10).toFixed(2);    // Returns "0.00"

2.34.toFixed(1);          // Returns "2.3"

-2.34.toFixed(1);         // Returns -2.3 (due to operator precedence, negative number literals don't return a string...)

(-2.34).toFixed(1);       // Returns "-2.3" (...unless you use parentheses)

Specifications

Specification Status Comment
ECMAScript 3rd Edition. Implemented in JavaScript 1.5 Standard Initial definition.
ECMAScript Language Specification 5.1th Edition (ECMA-262) Standard  
ECMAScript Language Specification 6th Edition (ECMA-262) Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

See Also

Document Tags and Contributors

Last updated by: adambrenecki,