clientWidth and clientHeight in JavaScript

Published on July 24, 2019

William Le

clientWidth and clientHeight in JavaScript

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Using clientWidth and clientHeight you’re able to get the pixel dimensions of an HTML element. The dimensions are calculated using the dimensions of content inside the HTML element, along with the padding.

Note: Borders, margins, or scrollbars (if present) are excluded when computing clientWidth and clientHeight

Using clientWidth and clientHeight

<div id="foo">
  Hello World
const clientWidth = document.querySelector('#foo').clientWidth;
const clientHeight = document.querySelector('#foo').clientHeight;

Learning Exercises

As an exercise, try calculating the value of clientWidth and clientHeight of the following HTML element:

clientwidth clientheight example 1

 **  If the HTML element is <div id="foo"/>  **
const clientWidth = document.querySelector('div#foo').clientWidth;
const clientHeight = document.querySelector('div#foo').clientHeight;
console.log(clientWidth, clientHeight);
// --> 200, 100

How was it calculated? Add the padding, with the content inside the HTML element, and ignore the margins and borders:

clientwidth clientheight example 2

(10 + 50) + 140   // clientWidth === 200
(30) + 70         // clientHeight === 100

Let’s try another! Try calculating the clientWidth and clientHeight of this HTML element:

clientwidth clientheight example 3

(10 + 10) + 230   // clientWidth === 250
(30 + 20) + 70    // clientHeight === 120


  • Block-level: clientWidth and clientHeight does NOT work with inline HTML elements (like span, em, or a). It’ll just return 0!
  • Rounded Values: Values are rounded to the nearest integer. If you need more precise values use getBoundingClientRect()
  • Read-Only: You can’t assign a new value to change the dimensions of the HTML element. For example this doesn’t do anything: someElement.clientWidth = 30

clientWidth and clientHeight are supported on all major desktop and mobile browsers.

See the official W3C specs for detailed information about clientWidth and clientHeight.

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William Le


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