How to use the percentage calculator
- Pick the box that matches your question.
- Type your two numbers.
- Read the result, which updates as you type.
Percentage formulas
- X% of Y = X ÷ 100 × Y
- X is what percent of Y = X ÷ Y × 100
- Percentage change = (new − old) ÷ old × 100
Example: a $80 item that now costs $100 has gone up by (100 − 80) ÷ 80 × 100 = 25%.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example 15% of 200 is 200 × 15 ÷ 100 = 30.
How do I calculate percentage increase?
Subtract the old value from the new value, divide by the old value and multiply by 100.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100.
Can a percentage be more than 100?
Yes. 150% of a number means one and a half times that number.