Aspect Ratio Calculator
Common Presets
Original Width (px)
Original Height (px)
Scale to New Size (enter one)
New Width
New Height
An aspect ratio calculator determines the proportional relationship between width and height, expressed as W:H. It lets you scale dimensions while preserving the original ratio to prevent distortion.
- 1Aspect Ratio = Width : Height, simplified by dividing both by their GCD
- 2GCD (Greatest Common Divisor) found using the Euclidean algorithm
- 3Scale by width: New Height = Original Height × (New Width ÷ Original Width)
- 4Scale by height: New Width = Original Width × (New Height ÷ Original Height)
1920 × 1080 pixels=Aspect ratio 16:9 — scale to 1280 wide gives 720 height
2560 × 1440 pixels=Aspect ratio 16:9 — scale to 1920 wide gives 1080 height
1024 × 768 pixels=Aspect ratio 4:3 — scale to 800 wide gives 600 height
| Ratio | Common Name | Typical Use |
|---|---|---|
| 16:9 | Widescreen | HD and 4K TV, YouTube, monitors |
| 4:3 | Traditional | Old TVs, tablets, iPad |
| 1:1 | Square | Instagram, profile photos |
| 9:16 | Portrait | Mobile video, TikTok and Reels |
| 21:9 | Ultrawide | Cinema and gaming monitors |
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