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Aspect Ratio Calculator

Calculate the missing width, height, or ratio for any image or video. Enter two values and get the third instantly. Choose from common ratio presets.

Calculator Tools Runs locally No data sent
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What is Aspect Ratio Calculator?

Aspect Ratio Calculator computes the missing dimension of an image or video given a known width, height, and target ratio. Use it to scale designs, crop correctly, or check display compatibility.

How to Use the Aspect Ratio Calculator

  1. Enter width and height to calculate the ratio.
  2. Or enter one dimension and a ratio to find the other.
  3. Use presets (16:9, 4:3, etc.) for common formats.

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Common Use Cases
  • Scale images to 16:9 for YouTube or video
  • Find the height for a given width at a fixed ratio
  • Check the ratio of an existing image size
  • Prepare thumbnails at exact social media dimensions
Frequently Asked Questions
How do I calculate a missing dimension?

Enter width and the ratio to get height, or enter height and the ratio to get width.

Is my data sent anywhere?

No. All calculations run in your browser.