Conversion & calculation
Percentage calculator
From ratios to discounts, get the numbers you need.
Percentage of a value
Find a percentage of a total value.
What percentage?
Find what percentage a part is of the whole.
Percentage change
Measure the change from an original value.
Discounted price
Calculate the sale price and amount saved.
Results are rounded to up to six decimal places.
How to use
- To find a percentage of a value, enter the total and percentage. For example, 15% of 200 is 30.
- A ratio is part ÷ total × 100. Percentage change is (new − original) ÷ |original| × 100.
- Enter an original price and a discount from 0% to 100% to see the sale price and amount saved. Calculate with the button or Enter.
Example
20% off 10,000 gives a sale price of 8,000 and savings of 2,000. A change from 100 to 80 is −20%.
Frequently asked question
How are zero and negative original values handled?
Percentage change from zero is undefined and shows a message. For a negative original value, the denominator uses its absolute value to preserve the direction of change. Results show up to six decimal places.