Online Percent Calculator
Free online percentage calculators. Fast, private, right in your browser.
Work out percentages, discounts, tips, taxes and more in seconds. Everything runs locally in your browser — your numbers never leave your device.
Percentage calculators
Percent Calculator
Calculate what is X% of a number, find what percent one value is of a total, and get exact results instantly — no data leaves your device.
Percent Change Calculator
Find how much a value has grown or dropped in percentage terms when it moves from one number to another.
Percent Difference Calculator
Compare two values and find their percentage difference, based on the average of the two numbers.
Add / Subtract Percentage
Add or subtract a percent from any number — useful for raises, surcharges and price adjustments.
Discount Calculator
Find the final price and your savings when applying a percent discount to any price, including quantity purchases.
Tip Calculator
Work out how much to tip, the total bill and what each person pays when splitting the check.
Tax / VAT Calculator
Add tax to a net price or pull the tax out of a gross price, using any tax rate.
Markup & Margin Calculator
Set a selling price from a markup or margin percent and see the resulting profit in one step.
Test Score Calculator
Convert the number of correct answers into a percentage score for any test, quiz or exam.
Rule of Three
Solve a direct proportion in one step: if a relates to b, what value does c relate to?
Reverse Percentage Calculator
If 25 is 20% of a number, what is the full number? Enter the part and the percent to find the original value instantly.
Percent to Decimal
Easily switch between percents and decimals: 42% becomes 0.42, and a decimal like 0.75 becomes 75%.
Compound Interest Calculator
See how money grows over time with compound interest — enter principal, annual rate and years to get the final amount.
Loan Payment Calculator
Estimate your monthly payment and total cost for a loan — enter amount, annual rate and term in months.
Commission Calculator
Calculate how much commission you earn from a sale and what's left after the commission is deducted.
How to calculate percentages
- Find X% of a number Y: multiply Y by X and divide by 100 (Y × X ÷ 100).
- Find what percent X is of Y: divide X by Y and multiply by 100.
- Find the percentage change from A to B: divide (B − A) by A and multiply by 100.
- Add percent P to a number N: multiply N by (1 + P ÷ 100).
Popular percentage calculations
Percentage FAQ
How to calculate X% of a number?
Multiply the number by X and divide by 100. For example, 20% of 150 = 150 × 20 ÷ 100 = 30.
How to find what percent one number is of another?
Divide the part by the total and multiply by 100. For example, 25 out of 200 = 25 ÷ 200 × 100 = 12.5%.
How to calculate percentage change?
Subtract the old value from the new one, divide the result by the old value and multiply by 100. A negative result means a decrease.
What is a percentage?
A percentage is a number expressed as a fraction of 100, written with the % sign. For example, 45% means 45 out of every 100.