# Math Constants (JavaScript)

Math constants return constant values that are properties of the Math object.

## Math Object Constants

The following table lists constant values that are properties of the Math object.

Constant

Description

Approximate value

Math.E

The mathematical constant e. This is Euler's number, the base of natural logarithms.

2.718

Math.LN2

The natural logarithm of 2.

0.693

Math.LN10

The natural logarithm of 10.

2.302

Math.LOG2E

The base-2 logarithm of e.

1.443

Math.LOG10E

The base-10 logarithm of e.

0.434

Math.PI

Pi. This is the ratio of the circumference of a circle to its diameter.

3.14159

Math.SQRT1_2

The square root of 0.5, or, equivalently, one divided by the square root of 2.

0.707

Math.SQRT2

The square root of 2.

1.414

## Example

The following example illustrates how to use the Math.PI constant.

```var radius = 3;
document.write(area);

// Output: 28.274333882308138
```

## Requirements

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.

Applies To: Math Object (JavaScript)