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Calculators Tool

Aspect Ratio Calculator

Calculate aspect ratios and resize dimensions without stretching — 16:9, 4:3, 9:16 presets.

Privacy-first workflows
Fast and simple
100% Free, no signup
Original size
×
New size — type one side, the other fills in
×
The highlighted box is calculated automatically to keep the 16:9 ratio.
Ratio
16:9
Decimal: 1.778 · 1920×1080
Common 16:9 resolutions
1280×720 (720p)
1920×1080 (1080p)
2560×1440 (1440p)
3840×2160 (4K)
Aspect ratio = width ÷ height, reduced to the smallest whole numbers. To resize without stretching: new height = new width × (original height ÷ original width).
How it works

How to use the aspect ratio calculator

STEP 01
Enter your original width and height (or tap a preset like 16:9).
STEP 02
Type the new width OR height you want — the other side fills in automatically.
STEP 03
Use the common-resolutions list for standard sizes in your ratio.
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FAQ

Common questions