Rule of Three Calculator
If A ➜ B
Then C ➜ X
Result (X)
0
Formula: (B × C) ÷ A = X
Result (X)
Formula: (B × C) ÷ A = X
The Rule of Three is one of the most used mathematical methods to solve direct or inverse proportionality problems. This free tool from Utilidades.io allows you to calculate the unknown value of a proportion by simply entering the three known values.
Our calculator handles the two fundamental scenarios of the rule of three:
Forget about making mistakes in manual calculations. Our calculator ensures instant and accurate results: