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Aspect Ratio Calculator

Work out width, height and scale from any aspect ratio.

Presets:

Calculated

Decimal ratio
Height for width
Width for height
Simplified

Fits inside a container

x
Largest fit (contain)
Scale factor
Smallest fill (cover)

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What Is Aspect Ratio Calculator?

The Aspect Ratio Calculator works out the missing dimension from any ratio, simplifies it to lowest terms, and calculates the largest size that fits inside a given container along with the scale factor and cover size.

Who Uses the Aspect Ratio Calculator?

Designers and developers use it to size images and embeds for a target ratio, to check that a banner is the right shape, and to work out the exact scale needed to fit or fill a container.

How to Use the Aspect Ratio Calculator

  1. Enter the ratio, such as 16:9.
  2. Type the width or height you already know.
  3. Read the calculated missing dimension and the simplified ratio.
  4. Enter a container size to see the fit, scale, and cover results.

Why Choose Our Aspect Ratio Calculator?

  • Calculates the missing dimension instantly
  • Simplifies ratios to lowest terms
  • Contain, scale, and cover maths for any container

Try the Aspect Ratio Calculator above — it is free, fast, and works on any device. Bookmark this page to return whenever you need it.