Ratio Calculator
Solve, simplify and share ratios.
How to use the Ratio Calculator
- Choose what to do
Find a missing value, simplify, or share a total.
- Type the numbers
The answer updates as you type.
- Copy the result
With one click.
Questions
Is it really free, with no sign-up?
Yes, completely. There's no sign-up, no login and no daily limit: just open the page and start. It works in your browser on any computer, phone or tablet with nothing to install.
How do I find the missing value in a ratio?
For A : B = C : ?, the answer is B × C ÷ A. Type A, B and C and it’s worked out for you.