Aspect Ratio Calculator

Simplify width-to-height ratios and scale one dimension proportionally.

Aspect Ratio Calculator
Local input
Output
Processing…
About this tool

Made for the task at hand.

Maintain image and video proportions during resizing. Enter matching-unit dimensions to obtain a reduced ratio and decimal width-to-height value, then optionally derive the missing dimension from a new width or height.

How to use

  1. Enter dimensions as width x height, for example 1920 x 1080.
  2. Choose ratio simplification or whether the target value is a new width or height.
  3. For proportional scaling, enter the positive target dimension and copy the resulting size.
Your work stays yours.
Tool inputs are processed locally in your browser and are never sent to KitVerse servers. Clear the workspace when using a shared device.
Common questions
Do width and height need to be pixels?

No. Any unit works as long as both dimensions use the same unit, because their ratio is dimensionless.

Are calculated dimensions rounded to whole pixels?

No. The tool preserves the calculated decimal value so you can choose rounding appropriate to the destination format.