Everyday maths
Percentage Calculator
Three common percentage questions, answered instantly.
How to calculate a percentage
To find a percentage of a number, divide the percentage by 100 and multiply by the number. For example, 20% of 150 is (20 ÷ 100) × 150 = 30. To find what percent one number is of another, divide the first by the second and multiply by 100. To find percentage change, subtract the old value from the new value, divide by the old value, and multiply by 100.
Everyday uses
- Working out a discount or a sales tax amount.
- Checking a tip or a service charge.
- Comparing a price rise or a pay increase.
- Understanding test scores and statistics.
Questions
How do I find the percentage difference between two numbers?
Use the "percentage change" mode. It subtracts the first value from the second, divides by the first, and multiplies by 100. A positive result is an increase; a negative result is a decrease.
What is 15% of 200?
15 ÷ 100 × 200 = 30. Enter 15 and 200 in the first mode to check any pair instantly.
Can percentages be more than 100?
Yes. If a value more than doubles, the percentage increase is above 100%. For example, going from 50 to 150 is a 200% increase.