Number.prototype.toFixed()

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

Try it

Syntax

toFixed()
toFixed(digits)

Parameters

digits Optional

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.

Return value

A string representing the given number using fixed-point notation.

Exceptions

RangeError

If digits is too small or too large. Values between 0 and 100, inclusive, will not cause a RangeError. Implementations are allowed to support larger and smaller values as chosen.

TypeError

If this method is invoked on an object that is not a Number.

Description

toFixed() returns a string representation of numObj 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 the absolute value of numObj is greater or equal to 1e+21, this method calls Number.prototype.toString() and returns a string in exponential notation.

Warning: Floating point numbers cannot represent all decimals precisely in binary. This can lead to unexpected results, such as 0.1 + 0.2 === 0.3 returning false .

Examples

Using toFixed

const numObj = 12345.6789;

numObj.toFixed()       // Returns '12346': rounding, no fractional part
numObj.toFixed(1)      // Returns '12345.7': it rounds up
numObj.toFixed(6)      // Returns '12345.678900': additional zeros
(1.23e+20).toFixed(2)  // Returns '123000000000000000000.00'
(1.23e-10).toFixed(2)  // Returns '0.00'
2.34.toFixed(1)        // Returns '2.3'
2.35.toFixed(1)        // Returns '2.4': it rounds up
2.55.toFixed(1)        // Returns '2.5': it rounds down as it can't
                       // be represented exactly by a float and the
                       // closest representable float is lower
2.449999999999999999.toFixed(1) // Returns '2.5': it rounds up as it less
                       // than NUMBER.EPSILON away from 2.45 and therefore
                       // cannot be distinguished
-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'

Specifications

Specification
ECMAScript Language Specification
# sec-number.prototype.tofixed

Browser compatibility

BCD tables only load in the browser

See also