JavaScript (ES2026) reference · Math Methods and Constants

JavaScript Math.exp() Method

Return e (about 2.718) raised to the given power, used for exponential growth, decay and probability formulas.

JavaScript (ES2026) Since ES1

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Syntax

Math.exp(x)

Parameter	Description
`x`	A number.

A number.

e to a powerTry it yourself

console.log(Math.exp(0), Math.exp(1) === Math.E);

Output

1 true

Exponential decayTry it yourself

const decay = (n0, k, t) => n0 * Math.exp(-k * t);
console.log(decay(100, 0.1, 10).toFixed(2));

Output

36.79

Version	Change
JavaScript ES1	Added

Math.log() · Return the natural logarithm (base e) of a number; divide by Math.log(base) to get a logarithm in any base.
Math.pow() · Return a base raised to an exponent. The ** operator does the same: Math.pow(2, 10) equals 2 ** 10.
JavaScript Math · tutorial
JavaScript Numbers · tutorial