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CALCULATOR · Math

Ratio Calculator

Simplify any ratio to smallest whole-number terms, with decimal value and share of total.

Show formula
a:b reduced by GCD after scaling away decimals

Inputs

Result

Your result appears here

Enter A : B and the result fills in as you type.

How it works

  1. Enter the first term (decimals allowed).
  2. Enter the second term.
  3. Read the simplified ratio, decimal value and share of total.

Frequently asked questions

Does it support decimals like 2.5:5?

Yes — decimals are scaled to integers first, then reduced exactly with the greatest common divisor.

What does "share of total" mean?

It expresses A as a percentage of A+B — useful for mixing and splitting problems.

Examples

Simplify 1920 : 1080
16 : 9 — the aspect ratio of a 1080p screen. The first term is 64% of the pair.
Simplify 45 : 60
3 : 4.
What is 16 : 9 as a decimal?
1.7778. The tool also scales any pair to "1 : n" and "n : 1" for comparison.

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