Aspect Ratio Calculator
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A three-mode aspect ratio tool for web designers, video producers, and photographers. Find Ratio: enter any width and height to get the reduced aspect ratio (e.g. 1920×1080 → 16:9), decimal equivalent (1.7778), and a visual rectangle preview. Scale: enter a ratio (e.g. 16:9) and one known dimension to calculate the other (e.g. width 1280 → height 720). Presets: 12 common ratios - HD/4K (16:9), standard TV/iPad (4:3), square (1:1), ultra-wide (21:9), portrait/reels (9:16), DSLR (3:2), panoramic (2:1), large monitor (5:4), portrait print (4:5), flat widescreen (1.85:1), cinemascope (2.35:1), A4 paper - each with a visual shape preview. 100% browser-based.
How to Use
- 1Find Ratio: enter a width and height, click 'Find Ratio' to get the reduced ratio (e.g. 1920×1080 → 16:9)
- 2Scale: enter a ratio and one known dimension to calculate the missing dimension
- 3Presets: browse 12 common ratios - click any to load it into the Scale tab
- 4Use the visual preview rectangle to verify the shape looks correct
- 5Copy the ratio or calculated dimension for use in your project
Features
- 3 modes: Find Ratio, Scale Dimensions, and Preset Browser
- Find Ratio: reduces width×height to simplest integer form (e.g. 1920×1080 → 16:9) with decimal equivalent
- Visual rectangle preview scaled proportionally to the ratio
- Scale: enter ratio + one dimension to calculate the other
- 12 presets: 16:9, 4:3, 1:1, 21:9, 9:16, 3:2, 2:1, 5:4, 4:5, 1.85:1, 2.35:1, A4
- Each preset shows a proportional shape preview
- 100% browser-based - no data sent anywhere
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