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Aspect Ratio Calculator

Find the aspect ratio of any width and height, and calculate the new height when resizing an image, video or screen without distortion. Free.

Aspect ratio
16:9
As a decimal
1.7778:1
Megapixels
2.07
New height: 720

Keeping proportions

The aspect ratio is a width-to-height proportion, reduced to its simplest whole numbers: 1920 × 1080 is 16:9. Video and TVs mostly use 16:9, older screens and many photos 4:3 or 3:2, Instagram posts 1:1 or 4:5, and phone videos and Stories 9:16. Enter a width and height to get the ratio, then type a new width to get the matching height, so an image or video scales without stretching.

How to use it

  1. 1

    Enter the width and height

    In pixels, or tap a common ratio.

  2. 2

    Read the ratio

    Simplified, and as a decimal like 1.78:1.

  3. 3

    Resize

    Type a new width to get the height that keeps the same shape.

Frequently asked questions

What resolution is 16:9?

Common 16:9 sizes are 1280 × 720 (720p), 1920 × 1080 (1080p), 2560 × 1440 and 3840 × 2160 (4K).

What aspect ratio is best for Instagram?

4:5 (1080 × 1350) takes the most space in the feed; 9:16 (1080 × 1920) suits Reels and Stories.

How do I calculate a new height?

New height = new width × original height ÷ original width. 1920 × 1080 scaled to 1280 wide is 720 high.

Is anything sent to a server?

No. Everything is calculated in your browser, and nothing you type is stored or sent anywhere.

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