Aspect Ratio Calculator
Enter a resolution to get its simplified aspect ratio, or start from a ratio and one side to get the missing dimension. Knows the common ratios like 16:9, 4:3 and 21:9 and shows how close your size is to each.
Everything runs locally in your browser. Your data never leaves your device.
Mode
Turn a resolution into its simplified ratio, or lock a ratio and solve the missing side.
Tip: paste a whole resolution like 1920x1080, 1920×1080 or 1920,1080 into either field.
1920 × 1080 px simplifies to
Against the common ratios
Every common ratio, sorted by how close your size comes. Wider means your size is more stretched than the ratio.
| Ratio | Name | Decimal | Deviation |
|---|---|---|---|
| 16:9 | widescreen | 1.778 | Exact match |
| 5:3 | 1.667 | 6.7% wider | |
| 16:10 | 1.6 | 11.1% wider | |
| 2:1 | univisium | 2 | 11.1% narrower |
| 3:2 | classic photo | 1.5 | 18.5% wider |
| 21:9 | ultrawide | 2.333 | 23.8% narrower |
| 4:3 | classic TV | 1.333 | 33.3% wider |
| 5:4 | 1.25 | 42.2% wider | |
| 32:9 | super ultrawide | 3.556 | 50.0% narrower |
| 1:1 | square | 1 | 77.8% wider |
Standard resolutions
The common 16:9 sizes. The true ratio column shows each size's exact simplified ratio.
| Name | Resolution | Megapixels | True ratio |
|---|---|---|---|
| nHD 360p | 640 × 360 px | 0.23 MP | 16:9 |
| HD 720p | 1280 × 720 px | 0.92 MP | 16:9 |
| Full HD 1080p | 1920 × 1080 px | 2.1 MP | 16:9 |
| QHD 1440p | 2560 × 1440 px | 3.7 MP | 16:9 |
| 4K UHD | 3840 × 2160 px | 8.3 MP | 16:9 |
| 5K | 5120 × 2880 px | 14.7 MP | 16:9 |
| 8K UHD | 7680 × 4320 px | 33.2 MP | 16:9 |
Next steps
Keep going. These tools open with your result loaded in.
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