Free Percentage Calculator
Calculate percentages instantly — find a percent of a number, see what percentage X is of Y, or get the percent change between two values.
What is __% of __?
__ is what % of __?
Percentage change from __ to __
How does Percent Wiz work?
Percent Wiz is a free percentage calculator that handles the three most common percent problems in one place. Use the first tab to find what a percentage of a number is — for example, what is 20% of 150? Use the second tab to figure out what percentage one number is of another. Use the third tab to calculate the percentage increase or decrease between two values.
Every calculation updates instantly as you type — no need to click a button. Percent Wiz works on any device and requires no sign-up or download.
Percentage calculations come up constantly in everyday life: figuring out a restaurant tip, calculating a sale price discount, understanding a pay raise, or tracking how much something has changed over time. Percent Wiz makes all of these fast and effortless.
Frequently Asked Questions
How do I calculate what percent of a number is?
To find what percent of a number is, multiply the number by the percentage and divide by 100. For example, 20% of 150 = (20 × 150) ÷ 100 = 30. Just enter the numbers in the first tab and Percent Wiz calculates it instantly.
How do I find what percentage one number is of another?
Divide the first number by the second and multiply by 100. For example, 30 is what percent of 150? (30 ÷ 150) × 100 = 20%. Use the second tab in Percent Wiz to get this instantly.
How do I calculate percentage change?
Percentage change = ((New Value − Old Value) ÷ Old Value) × 100. If a price went from $80 to $100, the change is ((100 − 80) ÷ 80) × 100 = 25% increase. Use the third tab in Percent Wiz for this calculation.
What is the difference between percentage increase and decrease?
A percentage increase means the new value is higher than the original — the result is positive. A percentage decrease means the new value is lower — the result is negative. Percent Wiz automatically labels the result as an increase or decrease.
Is Percent Wiz free to use?
Yes, Percent Wiz is completely free. There is no sign-up, no download, and no limit on how many calculations you can run.