Percentage calculator
Three quick calculations: a percent of a number, what percent one number is of another, and the change between two numbers.
What is X% of Y?
Enter both numbers.
X is what percent of Y?
Enter both numbers.
Percentage change from X to Y
Enter both numbers.
How the formulas work
- X% of Y = Y × X ÷ 100
- X is what percent of Y = X ÷ Y × 100
- Percentage change = (new − old) ÷ old × 100
Answers are rounded to 2 decimal places. Nothing you type is sent anywhere.
Marks percentage calculator ›Merit and aggregate calculator ›
Quick questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 150 is 150 × 20 ÷ 100 = 30.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. For example, 45 out of 60 is 45 ÷ 60 × 100 = 75%.
How do I work out a percentage increase or decrease?
Subtract the old value from the new one, divide by the old value, and multiply by 100. A positive answer is an increase and a negative one is a decrease.
How do I find my marks percentage?
Divide your total marks obtained by the total marks, then multiply by 100. The marks percentage calculator does this for several subjects at once.