Percentage Calculator
Three common percentage questions, one tool.
Quick percentage calculations: what is X% of a number, what percent is X of Y, and percentage increase/decrease. Each result shows the formula used, so you can check the math.
Formulas: standard percentage arithmetic, shown with each result.
How to use the Percentage Calculator
- Pick the calculation type.
- Enter the two numbers.
- Get the result with the formula shown below it.
Frequently asked questions
How do I calculate 15% of 250?
Enter 15 and 250 in the first mode — the answer (37.5) appears with the formula.
How do I find what percent one number is of another?
Use the second mode: for example, 45 is 18% of 250.
How do I calculate percentage increase?
Use the change mode: (new - old) / old x 100, for example 125 vs 100 is a 25% increase.
Can I calculate discounts?
Yes — use 'X% of a number' for the discount amount, then subtract it from the price.