Percentage Calculator
Calculate percentages, percent change, and more.
Percentages appear everywhere — discounts, tax rates, interest, exam scores, and population statistics. This percentage calculator handles three common types of percentage questions: finding what percentage one number is of another, calculating a percentage of a number, and calculating the percentage change between two values. No need to remember formulas — just enter your numbers and get instant results.
How to use this tool
- Select the type of calculation: percentage of a number, what percent is X of Y, or percentage change.
- Enter the required values in the input fields.
- The result is calculated automatically as you type.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage divided by 100. For example, 20% of 85 = 85 × (20/100) = 17.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. For example, 17 is what percent of 85? (17/85) × 100 = 20%.
How do I calculate percentage change?
Subtract the old value from the new value, divide by the old value, and multiply by 100. For example, from 80 to 100: ((100−80)/80) × 100 = 25% increase.
What is a percentage point?
A percentage point is the arithmetic difference between two percentages. If interest rates go from 3% to 5%, that is a 2 percentage point increase (not a 2% increase — the actual percentage increase is 67%).