Aspect ratio formulas and examples

A ratio describes shape; a resolution describes an exact pixel count.

More RatioGrid tools

Scale every frame with confidence.

Scale width and height, calculate missing dimensions, and reduce ratios.

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Aspect ratio calculator for every frame.

Calculate an aspect ratio from width and height and scale a preset without distortion.

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Ratio reducer for any dimensions.

Reduce width and height to the simplest whole-number ratio.

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RatioGrid privacy

How RatioGrid processes dimensions locally.

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Calculate a missing height

For ratio a:b and known width w, height = w × b ÷ a. Round only when the destination requires whole pixels.

Reduce dimensions

Divide both whole-number dimensions by their greatest common divisor. 1920 × 1080 reduces to 16:9.

RatioGrid

Scale dimensions and reduce ratios without losing proportion.

Tools

HomeAspect ratio calculator for every frame.Ratio reducer for any dimensions.

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