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Exact Pixel Aspect Ratio

Reduce whole pixel dimensions to an exact width-to-height ratio, preserving portrait or landscape orientation for real layout comparisons.

Use this result well

Inputs that matter
Width (pixels), Height (pixels)
Output to expect
Reduced aspect ratio
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Exact ratio of whole pixel dimensions

Reduce two positive whole pixel dimensions to an exact ratio. Keep orientation explicit and check camera or layout behavior in the actual application. An exact integer ratio; no display class is inferred. Fractional pixel dimensions are rejected instead of silently rounded. A ratio alone does not establish a field of view or safe area. Portrait and landscape inputs remain distinct.

Reduced width = width ÷ gcd(width, height); reduced height = height ÷ gcd(width, height)

Updated: September 2026

Example Scenarios

An arithmetic illustration using the values shown. Replace them with measurements or assumptions for your own scope.

Width (pixels): 1920Height (pixels): 1080

→ 16:9

FAQ

Rounding would change the ratio being described.

Only if the actual layout and scaling policy preserve the content. Check the rendered result.

Yes, to calculate the other orientation; it produces the reciprocal ratio.

About Exact Pixel Aspect Ratio

Reduce two positive whole pixel dimensions to an exact ratio. Keep orientation explicit and check camera or layout behavior in the actual application.