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TypedArray.BYTES_PER_ELEMENT

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

The TypedArray.BYTES_PER_ELEMENT static data property represents the size in bytes of each element in a typed array.

Try it

console.log(Float64Array.BYTES_PER_ELEMENT);
// Expected output: 8

console.log(Int8Array.BYTES_PER_ELEMENT);
// Expected output: 1

Value

A number whose value depends on the type of TypedArray.

Property attributes of `TypedArray.BYTES_PER_ELEMENT`
Writable	no
Enumerable	no
Configurable	no

Description

TypedArray objects differ from each other in the number of bytes per element and in the way the bytes are interpreted. The BYTES_PER_ELEMENT constant contains the number of bytes each element in the given TypedArray has.

The BYTES_PER_ELEMENT property is both an instance property and a static property. It's available on both TypedArray subclass constructors and on instances of those constructors.

As an instance property, BYTES_PER_ELEMENT is defined on the constructor's prototype.

console.log(Object.hasOwn(Int8Array.prototype, "BYTES_PER_ELEMENT")); // true

Examples

Using BYTES_PER_ELEMENT

As a static property:

Int8Array.BYTES_PER_ELEMENT; // 1
Uint8Array.BYTES_PER_ELEMENT; // 1
Uint8ClampedArray.BYTES_PER_ELEMENT; // 1
Int16Array.BYTES_PER_ELEMENT; // 2
Uint16Array.BYTES_PER_ELEMENT; // 2
Float16Array.BYTES_PER_ELEMENT; // 2
Int32Array.BYTES_PER_ELEMENT; // 4
Uint32Array.BYTES_PER_ELEMENT; // 4
Float32Array.BYTES_PER_ELEMENT; // 4
Float64Array.BYTES_PER_ELEMENT; // 8
BigInt64Array.BYTES_PER_ELEMENT; // 8
BigUint64Array.BYTES_PER_ELEMENT; // 8

As an instance property:

new Int8Array([]).BYTES_PER_ELEMENT; // 1
new Uint8Array([]).BYTES_PER_ELEMENT; // 1
new Uint8ClampedArray([]).BYTES_PER_ELEMENT; // 1
new Int16Array([]).BYTES_PER_ELEMENT; // 2
new Uint16Array([]).BYTES_PER_ELEMENT; // 2
new Float16Array([]).BYTES_PER_ELEMENT; // 2
new Int32Array([]).BYTES_PER_ELEMENT; // 4
new Uint32Array([]).BYTES_PER_ELEMENT; // 4
new Float32Array([]).BYTES_PER_ELEMENT; // 4
new Float64Array([]).BYTES_PER_ELEMENT; // 8
new BigInt64Array([]).BYTES_PER_ELEMENT; // 8
new BigUint64Array([]).BYTES_PER_ELEMENT; // 8

Specifications

Specification
ECMAScript® 2026 Language Specification> # sec-typedarray.bytes_per_element>

Browser compatibility

	Desktop					Mobile							Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`BYTES_PER_ELEMENT`	7	12	4	11.6	5.1	18	4	12	4.2	1.0	4	4.2	1.0.0	1.0	0.10.0