Solve proportion problems quickly and easily with our simple rule of three calculator. Ideal for mathematical, financial and everyday calculations. Free online tool that automatically calculates proportional values using the classic mathematical formula.
What is Simple Rule of Three?
The simple rule of three is a mathematical method for solving proportion problems. If A is to B, then C is to X. It is widely used in everyday calculations, financial mathematics and proportionality problems.
Formula: X = (B × C) / A
Calculator
Practical Example
If 3 people eat 6 loaves, how many loaves will 5 people eat?