Percentage Calculator
Enter a percentage and a number to find the resulting value - useful for tips, discounts, grades, and quick everyday math.
Last updated: September 22, 2026
Frequently asked questions
How do I calculate a percentage of a number by hand?
Divide the percent by 100, then multiply by the number. For 20% of 150: 0.20 × 150 = 30.
How do I find what percent one number is of another?
Divide the part by the whole, then multiply by 100. For example, 30 is what percent of 150? 30 ÷ 150 × 100 = 20%.
How do I calculate a percentage increase or decrease?
Subtract the old value from the new value, divide by the old value, then multiply by 100. Going from 150 to 180 is (180−150)/150×100 = 20% increase; going from 150 to 120 is (120−150)/150×100 = −20%, a 20% decrease.
How do I find the original price before a percentage discount was applied?
Divide the discounted price by (1 minus the discount as a decimal). If a $60 item is 25% off, divide 60 by 0.75 to get the original price of $80.
How do I calculate a percent of a percent, like 20% of 50%?
Convert both percentages to decimals and multiply them together, then convert back to a percentage: 20% of 50% is 0.20 × 0.50 = 0.10, or 10%. This comes up when combining rates - like a discount applied on top of an already-discounted price, or a tax rate applied to a partial amount.
What is 6/5 as a percentage?
120% - divide the numerator by the denominator (6 ÷ 5 = 1.2), then multiply by 100. A fraction greater than 1 (like 6/5) always converts to a percentage greater than 100%.
Is a percentage finder the same as this percentage calculator?
Yes - "percentage finder" just describes what this tool does: find what X percent of a number is, find what percent one number is of another, or find a percentage increase or decrease, all in one place.