Percentage calculator
Work out a percentage of a number, a percentage increase or decrease, a percent off a price, and the percent difference between two numbers. Everything runs locally in your browser.
How to calculate a percentage
- To find a percent of a number, multiply the number by the percent and divide by 100. So 20% of 80 is
80 × 20 ÷ 100 = 16. - To find what percent one number is of another, divide the part by the whole and multiply by 100. So 16 out of 80 is
16 ÷ 80 × 100 = 20%. - For a percentage increase or decrease, divide the change by the original value and multiply by 100. A positive answer is an increase, a negative answer a decrease.
- For a percent off, multiply the price by the percent off and divide by 100 to get the savings, then subtract that from the price for the final amount.
Example: going from 80 to 100 is a change of 20, and 20 ÷ 80 × 100 = 25%, so a 25% increase. A 30% discount on $250 saves $75 for a final price of $175.
Percentage calculator FAQ
How do you calculate a percentage?
To find what percent one number is of another, divide the part by the whole and multiply by 100. For example, 20 out of 50 is 20 divided by 50, which is 0.4, then times 100, so 40 percent. To find a percent of a number instead, multiply the number by the percent and divide by 100.
How do you calculate a percentage increase or decrease?
Subtract the old value from the new value, divide by the old value, then multiply by 100. A positive result is an increase and a negative result is a decrease. For example, from 80 to 100 is 100 minus 80, which is 20, divided by 80, then times 100, so a 25 percent increase.
How do you calculate percent off a price?
Multiply the original price by the percent off and divide by 100 to get the savings, then subtract the savings from the original price to get the final price. For example, 30 percent off 250 is a saving of 75 and a final price of 175.
What is the difference between percentage change and percentage difference?
Percentage change has a direction and a starting point, so it divides the change by the original value. Percentage difference has no starting point and compares two values by dividing the absolute difference by the average of the two. Use change when something moves from an old value to a new value, and difference when you are simply comparing two numbers.
How do you calculate a percentage in Excel?
Divide the part by the whole in a formula such as =A1/B1, then format the cell as a percent so Excel adds the times 100 step for you. To take a percent of a number, multiply instead, for example =A1*B1.