Aspect Ratio Calculator
Find 16:9-style ratios and resize sizes.
Find the ratio of a size
×
16:9
= 1.778 : 1
Resize while keeping a ratio
1280 × 720
How to use
- 1Enter a width and height to see their ratio.
- 2Pick a ratio preset such as 16:9 or 9:16.
- 3Type a new width (or height).
- 4Read the matching height (or width).
Frequently asked questions
What size is 16:9?
Common 16:9 sizes are 1280×720 (HD), 1920×1080 (Full HD) and 3840×2160 (4K).
Which ratio should I use for Reels and Shorts?
9:16 vertical, usually 1080×1920. Instagram feed posts look best at 4:5 (1080×1350).
Why does 1366×768 show 683:384?
Some screen sizes aren't an exact ratio. The tool shows the exact fraction and the closest well-known ratio, here about 16:9.
Can I use it for print sizes?
Yes. The A4 preset uses the 210 × 297 mm ratio, which all A-series paper shares.
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