Rule of Three Calculator
Solve a direct proportion in one step: if a relates to b, what value does c relate to?
What is the formula behind the Rule of Three Calculator?
(Value c × Value b) ÷ Value a
Percentage FAQ
How does the Rule of Three Calculator work?
Solve a direct proportion in one step: if a relates to b, what value does c relate to? Example: (Value c × Value b) ÷ Value a.
What is the formula behind the Rule of Three Calculator?
(Value c × Value b) ÷ Value a.
Can you show a calculation example?
Example: Value a: 2, Value b: 6, Value c: 5 → Answer: 15.
Is the Rule of Three Calculator free and private?
Yes. Everything is calculated in your browser on your device: the numbers you enter never leave it. No registration, no usage limits and no collection of your inputs.