Percentage Calculator
Choose the type of percentage calculation you need.
What is X% of Y?
Result
X is what % of Y?
Result
Percentage increase / decrease
Percentage Change
How to Calculate Percentages
A percentage is a fraction of 100. To find X% of Y, multiply Y by X and divide by 100. For example, 15% of 80 = (80 × 15) ÷ 100 = 12. To find what percent X is of Y, divide X by Y and multiply by 100 — so 30 out of 200 is (30 ÷ 200) × 100 = 15%.
Percentage change measures how much a value has grown or shrunk relative to its starting point. The formula is ((New − Old) ÷ Old) × 100. A positive result is an increase; a negative result is a decrease. This is useful for comparing prices, tracking statistics, or evaluating performance over time.