Calculator Inputs
%
Results
30
Result
About This Calculator
Percentages show a number as a fraction of 100 and appear everywhere — discounts, tips, grades, growth rates, and statistics. This calculator handles the three most common percentage problems.
The Three Formulas
- What is P% of V? → (P ÷ 100) × V
- X is what % of Y? → (X ÷ Y) × 100
- X is P% of what? → X ÷ (P ÷ 100)
Switch the calculation type above to jump between them — the inputs update automatically.
Frequently Asked Questions
How do I find what percent one number is of another?
Divide the first number by the second, then multiply by 100. For example, 30 out of 200 is (30 ÷ 200) × 100 = 15%.
What is 15% of 200?
Multiply 200 by 0.15 (which is 15 ÷ 100). 200 × 0.15 = 30, so 15% of 200 is 30.
Why does my result show a dash?
A dash appears when a calculation would divide by zero (for example, asking what percent of 0). Enter a non-zero value for the “of” number to get a result.