What common aspect ratios are available as presets?

16:9 (widescreen HD), 4:3 (standard TV/monitor), 1:1 (square/Instagram), 21:9 (ultrawide), 9:16 (portrait/mobile), 3:2 (photo), 4:5 (Instagram portrait), and 2.39:1 (cinema).

How do I scale to a target width?

Enter your desired width in the 'Scale to' field and the tool calculates the corresponding height to maintain the same ratio.

What is the decimal ratio?

Width divided by height as a decimal. 16:9 = 1.7778. Useful for CSS padding-top tricks and responsive design.

Can I use it for video exports?

Yes — enter your video dimensions to check the ratio, then use a preset to find standard export dimensions.

Aspect Ratio Calculator

Calculate aspect ratios and scale dimensions at any size. Instant, accurate, free.

No sign-up Batch convert 100% free

Width

Height

16:9

Ratio

1.7778

Decimal

56.25%

Height %

Scale to target size

Target Width → Height

→—

Target Height → Width

→—

How useful is Aspect Ratio Calculator?

How to Use Aspect Ratio Calculator

Enter the width and

Enter the width and height of your media or container

View the simplified aspect

View the simplified aspect ratio (e.g. 16:9) instantly

Use the presets to

Use the presets to select common ratios like 16:9, 4:3, or 1:1

Enter a target width

Enter a target width or height to calculate the scaled dimension

Frequently Asked Questions

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