Ratio Calculator
Solve A : B = C : ?, simplify ratios and divide an amount (like profit) in a given ratio.
:=:
Leave exactly one box empty.
Runs in your browser — your data never leaves your device.
About the Ratio Calculator
Ratios are everywhere — scaling recipes, mixing cement, reading map scales and sharing profit between partners. Choose what you need: find a missing value, simplify a ratio, or divide an amount in a ratio.
How to use the Ratio Calculator
- Choose the mode.
- Enter the numbers (leave one box empty when finding the missing value).
- Read the answer.
Formula
Proportion: A : B = C : D, so A × D = B × C. Simplify: divide every part by their greatest common divisor. Share: each share = amount × part ÷ sum of parts.
Examples
- 3 : 4 = 15 : ? → 20
- 12 : 18 : 30 simplifies to 2 : 3 : 5
- Rs 50,000 profit shared 2 : 3 → Rs 20,000 and Rs 30,000
Frequently asked questions
Is my data sent to your server?
No. Everything runs in your browser, on your own device. Nothing you type, paste or choose is uploaded or stored.