Free Aspect Ratio Calculator
Calculate the missing dimension from any aspect ratio. Choose from common presets (16:9, 4:3, 1:1, 21:9, 3:2, 8:5, 16:10) or set a custom ratio. Enter a known width or height to calculate the other dimension. See a visual preview of the ratio. All processing happens locally.
How to Use
- Pick a common ratio preset or enter custom values
- Enter a known width to calculate height, or vice versa
- Results update instantly
Privacy
All calculations happen locally. No data is transmitted.
Last reviewed: July 2026.