Calculate percentages online in seconds. Find a percentage of any number, compare two values, or work out a percentage increase or decrease—with the formula shown for every answer.
20% of 150 is 30.
A percentage describes a part out of 100. This free percentage calculator handles the three calculations people use most often, from checking a discount or test score to measuring business growth.
Convert the percentage to a decimal, then multiply it by the number. For example, 20% of 150 = (20 ÷ 100) × 150 = 30.
Divide the first number by the second, then multiply by 100. For example, 30 is 20% of 150.
Subtract the original value from the new value, divide by the absolute original value, then multiply by 100.
Use percentage calculations to check sale discounts, tax, tips, markups, exam scores, interest, profit margins, population changes, and progress toward a goal. Select the calculation type above and enter any positive or negative decimal values. Results update instantly in your browser.
Find the discount amount with “percentage of a number,” then subtract it from the original price to get the sale price.
Use “one number as a percentage” to convert points earned out of total points into a percentage score.
Compare an old and new value to calculate the percentage increase or percentage decrease between them.
Divide the percentage by 100 and multiply by the number. For example, 15% of 80 is 12.
Divide the first number by the second and multiply by 100.
Subtract the original value from the new value, divide by the absolute original value, and multiply by 100.
Yes. The percentage calculator is free to use online and requires no registration or download.
Yes. Calculations happen locally in your browser, and your numbers are not uploaded or stored.