Percentages, made simple.
Find X% of Y. Enter your numbers to see the answer and formula.
Check a tip, a commission or a budget share.
Start with the amount you know.
Check the formula
alongside your answer.
Divide the percentage by 100, then multiply by the value.
| Question | Answer |
|---|---|
| 20% of 150 | 30 |
| 15% of 200 | 30 |
| 12.5% of 80 | 10 |
Try these values in the calculator above.
Start with four free online tools.
Find even more in the app with Premium.
Find a percentage of any number.
FreeSee the change between two values.
Freea is %b of c. Find the missing total.
FreeFind a part as a percentage of the total.
PremiumCalculate savings and sale prices.
PremiumWork backwards to the original value.
PremiumCalculate how interest grows over time.
PremiumEstimate a monthly mortgage payment.
PremiumIncrease or decrease a starting value.
PremiumConvert a fraction to a percentage.
PremiumConvert a percentage to a decimal.
PremiumCompare two percentage values.
PremiumFind the interest rate calculator in the app.
Need another calculation? Premium unlocks all app calculators and removes ads. Open a calculator page for its formula and examples.
Explore the appPercent means “per hundred.” A percentage describes a number relative to 100: 25% is 25 out of 100, or one quarter. The percent symbol % is another way of writing a fraction with a denominator of 100.
To calculate a percentage of a number, multiply the number by the percentage and divide by 100. For example, 20% of 150 is 20 × 150 ÷ 100 = 30. Here, 150 is the whole, 20% is the rate and 30 is the part.
The missing value determines which formula to use. Choose the question that matches your numbers.
| Your question | Example | Free calculator |
|---|---|---|
| What is X% of Y? | 20% of 150 = 30 | Percentage of a number |
| What percent is A of B? | 30 out of 150 = 20% | Percentage of total |
| A is B% of what number? | 30 is 20% of 150 | Find the whole |
| How much did a value change? | 100 to 120 = 20% increase | Percentage change |
These four tools are free online and in the mobile app. Other functions, including discounts, reverse percentages and compound interest, require Premium in the app.
A 15% tip on a bill of 48 is 7.20: enter 15 as the percentage and 48 as the value. The answer is the tip itself. Add it to the bill separately to get 55.20 before splitting the payment.
If a commission is 6% of a sale worth 2,500, the amount is 150. If you set aside 10% of a budget of 800, that share is 80. Use the same units throughout: a percentage is unitless, but the resulting amount has the same unit as the starting value.
For a stated sales tax rate of 8% on an amount of 50, the tax amount is 4. Adding that amount gives a total of 54. Use the applicable rate and taxable amount for your transaction.
20% of a price of 150 is a saving of 30. The price after the discount is 120. The discount calculator app feature explains the relationship between the original price, saving and sale price.
50% is 0.5 or one half; 25% is 0.25 or one quarter; 10% is 0.1 or one tenth. These equivalents help you check whether an answer makes sense. Half of 80 is 40, so 50% of 80 should also be 40.
For a quick mental calculation, find 10% by dividing by 10. Then halve that amount to get 5%, or double it to get 20%. For example, 10% of 240 is 24, so 5% is 12 and 15% is 36.
Enter 12.5 to calculate 12.5%, rather than entering its decimal equivalent 0.125. The calculator already divides the percentage by 100. Use a decimal point or an unambiguous decimal comma. For thousands, enter 1000 without a separator. If a comma could mean either a decimal or thousands, the calculator asks you to clarify it.
Use The Percentage Calculator on iPhone, iPad or Android. Start with four free modes for percentage amounts, percentage change, finding the whole and a part as a percentage of the total.
Still need a hand?
We’re here to help
Percentage of a value, percentage change, finding the whole (“a is %b of c”), and a part as a percentage of the total. Each has its own page on this site, with no sign-up.
Premium unlocks all calculators in the mobile app and removes ads. Choose a monthly plan or a lifetime purchase. Current prices and terms are shown in your app store and in the app.
“Find the whole” works out the total when you know a part and its percentage: 30 is 20% of 150. “Part of a total” finds the percentage when you know both amounts: 30 out of 150 is 20%.
The calculators on this page run in your browser. The numbers you enter are not sent to a server. Copying a result uses your device’s clipboard.
The Percentage Calculator is available on the App Store for iPhone and iPad, and on Google Play for Android. Check your store listing for device compatibility.
Divide the number by 5, or multiply it by 0.2. For 150, both methods give 30. In this calculator, enter 20 in Percentage and 150 in Value.
Multiply the first rate as a decimal by the second percentage. For example, 50% of 20% is 0.50 × 20% = 10%. In this calculator, enter 50 and 20; the numeric answer 10 represents 10% in that context.
Divide the number by 100. For example, 1% of 450 is 4.5. To find 3%, multiply that answer by 3 to get 13.5.
This page finds a part of a known value, so 20% of 150 returns 30. To turn two amounts into a percentage, use the percentage of total calculator.
Free download for iPhone, iPad and Android. Optional Premium unlocks all calculators.
