files/en-us/web/javascript/reference/global_objects/math/exp/index.md

metadata

title: Math.exp()
short-title: exp()
slug: Web/JavaScript/Reference/Global_Objects/Math/exp
page-type: javascript-static-method
browser-compat: javascript.builtins.Math.exp
sidebar: jsref

The Math.exp() static method returns e raised to the power of a number. That is

$$𝙼𝚊𝚝𝚑.𝚎𝚡𝚙(𝚡)={\mathrm{e}}^x\backslash mathtt\{\backslash operatorname\{Math.exp\}(x)\}\; =\; \backslash mathrm\{e\}^x$$

{{InteractiveExample("JavaScript Demo: Math.exp()")}}

console.log(Math.exp(0));
// Expected output: 1

console.log(Math.exp(1));
// Expected output: 2.718281828459 (approximately)

console.log(Math.exp(-1));
// Expected output: 0.36787944117144233

console.log(Math.exp(2));
// Expected output: 7.38905609893065

Syntax

Math.exp(x)

Parameters

• x
  • : A number.

Return value

A nonnegative number representing e^x, where e is the base of the natural logarithm.

Description

Because exp() is a static method of Math, you always use it as Math.exp(), rather than as a method of a Math object you created (Math is not a constructor).

Beware that e to the power of a number very close to 0 will be very close to 1 and suffer from loss of precision. In this case, you may want to use {{jsxref("Math.expm1")}} instead, and obtain a much higher-precision fractional part of the answer.

Examples

Using Math.exp()

Math.exp(-Infinity); // 0
Math.exp(-1); // 0.36787944117144233
Math.exp(0); // 1
Math.exp(1); // 2.718281828459045
Math.exp(Infinity); // Infinity

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{jsxref("Math.E")}}
• {{jsxref("Math.expm1()")}}
• {{jsxref("Math.log()")}}
• {{jsxref("Math.log10()")}}
• {{jsxref("Math.log1p()")}}
• {{jsxref("Math.log2()")}}
• {{jsxref("Math.pow()")}}