How to Use the Percentage Calculator
- Pick the type of percentage problem you want to solve.
- Enter the two numbers the calculation needs.
- The answer is computed instantly.
- Switch modes to solve a different percentage question.
Frequently Asked Questions
How do I find a percentage of a number?
Multiply the number by the percentage divided by 100. For example, 20% of 150 is 150 × 0.20 = 30.
How do I calculate percentage change?
Subtract the old value from the new value, divide by the old value, then multiply by 100. A rise from 80 to 100 is a 25% increase.
What is 'what percent of' used for?
It answers questions like 'what percent is 30 of 150?' — here 30 ÷ 150 × 100 = 20%. Useful for scores, tips and proportions.
Can it handle decimals?
Yes. You can enter decimal values and the calculator returns precise percentage results.