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Calculate Aspect Ratio & Dimensions

Find an aspect ratio or the missing width or height

Presets

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About This Tool

Aspect Ratio Calculator (aspect ratio finder) works both ways. Enter width and height to get a simplified ratio such as 16:9. Or pick a preset β€” 16:9, 4:3, 1:1, 9:16, 3:2, and more β€” lock one side, and the other dimension is calculated. All math is processed locally in your browser β€” nothing is uploaded.

How to Use

  1. Enter a width and height to see the simplified ratio
  2. Or choose a preset such as 16:9 or 1:1
  3. Lock width or height
  4. Type the locked side
  5. Read the calculated other side

Common Use Cases

  • Video: Resize a frame to 16:9 or 9:16
  • Design: Keep 4:3 or 3:2 when scaling artwork
  • Social: Match 1:1 or 9:16 canvases
  • Photography: Find the ratio of a crop
  • Web: Compute a missing width or height for CSS

FAQ

Q1: How is the ratio simplified?

Width and height are divided by their greatest common divisor. 1920Γ—1080 becomes 16:9.

Q2: What does lock width mean?

The width stays as you typed it. Height is recalculated from the selected ratio.

Q3: Which presets are included?

16:9, 4:3, 1:1, 9:16, 3:2, 2:3, 21:9, and 5:4. You can also enter a custom ratio.

Q4: Are my dimensions uploaded?

No. Calculation is processed locally in your browser.

Q5: Can I use decimals?

Yes. Width, height, and custom ratio parts can be decimals.

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