How to Use Ratio Calculator
Reduce a ratio to its simplest form and solve proportions by leaving one value blank.
Open the Ratio Calculator tool →What is Ratio Calculator?
Simplify ratios and solve proportions (A:B = C:D). It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use Ratio Calculator
- Open the Ratio Calculator tool.
- Enter your details or values.
- The result is calculated instantly.
- Copy or use the result. Everything runs in your browser — nothing is uploaded.
Frequently asked questions
What can it do?
Simplify a ratio to its lowest terms, and solve proportions where one value in A:B = C:D is unknown.
How does it simplify?
It divides both parts by their greatest common divisor, so 8:12 becomes 2:3.
Is my data uploaded?
No — it's calculated locally.
Ready to try it?
Open Ratio Calculator →