JavaScript Number()

Convert booleans and dates to a number:

Number(true);
Number(false);
Number(new Date());

More examples below.

Description

The Number() method converts a value to a number.

If the value cannot be converted, NaN is returned.

For booleans, Number() returns 0 or 1.

For dates, Number() returns milliseconds since January 1, 1970 00:00:00.

For strings, Number() returns a number or NaN.

Number(value)

Parameter	Description
value	Optional. A JavaScript value (variable).

Type	Description
A number	Returns the value as a number. If the value cannot be converted to a number, NaN is returned. If no value is provided, 0 is returned.

Number() is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes

Convert different numbers to a number:

Number(999);
Number("999");
Number("999 888");

Convert different arrays to a number:

Number([9]);
Number([9.9]);
Number([9,9]);