Aspect Ratio Calculator

Calculate & convert aspect ratios

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Full guide

How to Calculate Aspect Ratios for Images and Video

Learn 16:9, 4:3, and 1:1 ratios, proportional scaling, and GCD-reduced forms so you can size images and video without distortion.

Read the guide

About Aspect Ratio Calculator

An aspect ratio calculator that finds the aspect ratio from any width and height, calculates missing dimensions given a ratio, and scales proportionally. Supports common presets (16:9, 4:3, 21:9, 1:1) and custom ratios. Shows GCD-reduced ratios, pixel counts, and common use cases for each ratio. Essential for video editors, photographers, web designers, and UI developers working with responsive layouts.

Aspect Ratio Calculator Features

  • Ratio detection
  • Dimension calculator
  • Common presets
  • Proportional scaling
  • Pixel count

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