Aspect Ratio Calculator

Free online Aspect Ratio Calculator.

Calculator

How to Use

  1. Enter the required values
  2. Click Calculate to see the result
  3. Review the detailed output

Formula

Ratio = Width : Height (simplified by GCD). To find dimension: Height = Width / Ratio. Common: 16:9 (HD), 4:3 (standard), 21:9 (ultrawide), 1:1 (square).

Example Calculations

16:9 Resolution

Input: Width: 1920 pixels, Ratio: 16:9

Result: Height: 1080 pixels (Full HD)

Custom Dimensions

Input: Width: 3000px, Height: 2000px

Result: Aspect ratio: 3:2

Ultrawide

Input: Width: 3440px, Ratio: 21:9

Result: Height: 1474 pixels

About This Calculator

Free online aspect ratio calculator. Calculate instantly in your browser with our easy-to-use tool. No sign-up required.

Our aspect ratio calculator is free, easy to use, and provides instant results. All calculations are performed in your browser for privacy and speed.

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Frequently Asked Questions

What is aspect ratio?

Width:height proportion. Common: 16:9 (widescreen), 4:3 (standard), 21:9 (ultrawide).

Calculate dimensions for ratio?

For 16:9: height = width / 16 x 9. 1920px width = 1080px height.

Aspect ratio for video?

16:9 for YouTube/TV. 9:16 for TikTok/Reels. 1:1 for Instagram. 2.39:1 for cinema.

Aspect ratio in photography?

DSLRs: 3:2. Mirrorless/phones: 4:3. Social: 4:5 Instagram portrait, 1.91:1 Facebook.

Why black bars?

Video ratio does not match display. 21:9 movie on 16:9 TV shows letterboxing.