Free percentage calculator
Answer any everyday percentage question: a percentage of a number, a change, a discount, tax, a tip, margin and markup, or the original value, with the formula for every answer.
- Free for everyone
- No signup needed
- Works on any device
How to use
- Find the question that matches yours in the list at the top, such as Percentage change or Tip and bill split.
- Type your numbers into the boxes in that sentence. You can use a comma or a point for decimals.
- Read the answer, which updates as you type, together with the formula used.
- Select Copy answer to paste the result, or Copy link to share the calculation with your numbers.
Examples
What is 15% of 80?
15% of 80 is 12 (80 × 15 ÷ 100).
A $120 jacket is 25% off
You pay $90 and save $30.
Rent went up from 1,500 to 1,650
That is a 10% increase ((1,650 − 1,500) ÷ 1,500 × 100).
A $60 dinner for two with a 15% tip
The tip is $9, the total $69, and each person pays $34.50.
A price of 120 includes 20% VAT
The price before tax is 100 and the tax is 20. Choose already included in Add or remove tax.
Bought for 60, sold for 100
The profit is 40: a 40% margin on the selling price, but a 66.67% markup on the cost.
Limitations
- Results are rounded to four decimal places (two for prices).
- Percentage change is measured from the starting value. A change from 0 has no percentage.
- The tax calculator uses one rate. For several taxes on top of each other, apply them one at a time.
Privacy
This tool works entirely in your browser. What you type is not sent to our servers, and it is not stored after you close the page unless the tool offers to keep it and you turn that on. Read our privacy notice.
Troubleshooting
My answer looks too large
Check that you used the right calculator. 25 is 12.5% of 200, but 25% of 200 is 50. Both questions are on this page.
A box turned red
That box does not contain a number. Remove letters or extra symbols. Both 1,250.5 and 1.250,5 are accepted.
Questions and answers
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number. For example, 15% of 80 is 15 ÷ 100 × 80 = 12.
How do I work out a percentage increase or decrease?
Subtract the old value from the new value, divide by the old value and multiply by 100. From 80 to 100 is (100 − 80) ÷ 80 × 100, a 25% increase.
How do I calculate a discount?
Multiply the price by the discount percentage and divide by 100 to get the saving, then subtract it from the price. 25% off 80 saves 20, so you pay 60.
How do I find the original price before a percentage was added?
Divide the final value by 1 plus the percentage as a decimal. A price of 110 after a 10% increase was 110 ÷ 1.10 = 100. Use Original value before a percentage change.
Why is a 50% increase not undone by a 50% decrease?
Each percentage applies to a different starting value. 100 plus 50% is 150, but 150 minus 50% is 75. To undo a 50% increase you need a decrease of about 33.3%. Two changes in a row shows the overall effect.
How do I remove VAT or sales tax from a price?
Divide the price by 1 plus the tax rate as a decimal. A price of 120 with 20% VAT included is 120 ÷ 1.20 = 100 before tax, so the tax is 20.
What is the difference between margin and markup?
Both use the same profit. Margin divides it by the selling price; markup divides it by the cost. Buying at 60 and selling at 100 is a 40% margin and a 66.67% markup.
What is a percentage point?
The plain difference between two percentages. A rate going from 4% to 5% rises by 1 percentage point, which is a 25% increase in the rate itself.
Updated