Percent of a number
What is % of ?
Percentage Calculator
Seven live calculators for every percent question. Free
What percent is it?
is what % of ?
Percentage change
From to
Increase or decrease by %
by %
Find the whole
is % of what?
Percentage difference
Between and
Discount & sale price
Price with % off
You pay
You save
About the Percentage Calculator
Whisser Percentage Calculator answers the everyday percent questions in one place: what X% of a number is, what percent one number is of another, how much a value changed, the result of adding or removing a percentage, the original number behind a percentage, the percentage difference between two values and the price after a discount. Every card updates as you type and shows the formula with your numbers, so you can check the working.
How to use
- Find the card that matches your question, such as Percent of a number or Percentage change.
- Type your numbers into the boxes in the sentence. The answer updates instantly.
- Use the arrow keys in a box to nudge the number up or down. Hold Shift to step by 10.
- Choose how many decimal places to show, then use the copy button to copy any result.
Frequently asked questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number. For example, 15% of 240 is 15 ÷ 100 × 240 = 36.
How do I work out percentage change?
Subtract the old value from the new value, divide by the old value and multiply by 100. Going from 50 to 65 is (65 − 50) ÷ 50 × 100 = a 30% increase. A negative result is a decrease.
What is the difference between percentage change and percentage difference?
Percentage change compares a new value with an original one, so the direction matters. Percentage difference compares two values on equal terms by dividing the gap between them by their average, so the order does not matter.
How do I find the original price before a percentage was added?
Use the X is P% of what calculator. If 120 is 80% of a number, the number is 120 ÷ 0.8 = 150. To remove a 20% markup from 120, find what 120 is 120% of, which is 100.
Can I type numbers with commas?
Yes. Commas used as thousand separators, such as 1,250,000, are understood. A single comma followed by one or two digits, such as 12,5, is read as a decimal point.
Is the percentage calculator free?
Yes. It is free, needs no account and all calculations run in your browser.