Calculate percentages instantly — find what a percentage of a number is, work out what percent one value is of another, or measure percentage increase and decrease. All results update live as you type.
Frequently Asked Questions
How do I calculate a percentage of a number?
Use the What is X% of Y? tab. Enter the percentage and the number — for example, 20% of 150 gives 30. The formula is (percentage ÷ 100) × number.
How do I find what percent one number is of another?
Use the X is what % of Y? tab. Enter both values — for example, 25 is 12.5% of 200. The formula is (part ÷ whole) × 100.
How is percentage change calculated?
Percentage change = ((new value − old value) ÷ old value) × 100. A positive result is an increase; a negative result is a decrease. An old value of zero cannot be calculated.
Can I use this for discounts or tips?
Yes. For shopping discounts try the Discount Calculator. For restaurant bills use the Tip Calculator.
Is this tool free and does it work on mobile?
Yes on both counts. The Percentage Calculator on draft21 is completely free with no sign-up required and works on all devices.