Proportion Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter a, b and c.
- Press Calculate for x.
How it works
Solves a : b = c : x for the unknown: x = b × c ÷ a.
Worked example
2 : 4 = 3 : x. x = 6.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.