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Aspect Ratio Calculator

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Aspect Ratio Calculator

Calculate the correct width or height to maintain an aspect ratio. Supports common presets (16:9, 4:3, 1:1, 9:16) and custom ratios. Useful for responsive images and video embeds.

Common Presets

16:9
Widescreen
4:3
Standard
1:1
Square
9:16
Portrait
21:9
Cinematic
3:2
DSLR Photo

Ratio → Dimensions

:
Enter ratio and width to calculate

Dimensions → Ratio

Enter dimensions to find ratio

How to Use

1

Use a preset or enter ratio

Click a common preset (e.g. 16:9 for YouTube) or type a custom ratio in the ratio fields.

2

Enter width

Type the desired width in pixels. The tool calculates the correct height to preserve the ratio.

3

Find ratio from dimensions

Use the second tool to find the simplified ratio (e.g. 16:9) from any pair of width and height values.

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