Aspect Ratio Calculator
Free online aspect ratio calculator. Calculate aspect ratios, find missing dimensions, and convert between sizes while maintaining proportions. Perfect for video, photo, and web design.
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Enter dimensions to calculate the aspect ratio
Golden ratio φ: 1.618034 : 1 ≈ 1.618 : 1
How to Use
Enter dimensions
Type a width and height in pixels (or any unit). The aspect ratio is calculated instantly.
Find a missing dimension
Switch to the second mode, enter the ratio and one dimension to calculate the other proportionally.
Compare to common ratios
The tool shows the nearest common aspect ratios (16:9, 4:3, 1:1, etc.) for reference.