Percentage Calculator
Solve the four most common percentage problems instantly.
How to use: Pick the kind of percentage question you have, type two numbers and read the answer straight away.
How to use the Percentage Calculator
A percentage is simply a fraction out of one hundred, and almost every discount, tax rate, interest rate and statistic uses one. This page packs the four calculations people need most into a single tool, so you can solve a problem without remembering which formula applies.
X% of Y multiplies the number by the percentage divided by 100. X is what percent of Y divides the first number by the second and multiplies by 100. Percentage change subtracts the old value from the new value, divides by the old value, and multiplies by 100; a positive answer is an increase and a negative one a decrease. The last section raises or lowers a number by a given percentage.
Type into any pair of boxes and the answer updates immediately. Results are rounded to six decimal places and trailing zeros are removed.
A useful warning: percentage points and percent are different. If an interest rate rises from 4% to 5%, it has gone up by one percentage point but by 25 percent. Another trap is that a 50% increase followed by a 50% decrease does not return to the start, because the second percentage applies to a larger number. Checking calculations with this tool helps avoid such mistakes.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 15% of 200 is 200 × 15 ÷ 100 = 30.
How do I find percentage change?
Subtract the old value from the new value, divide by the old value and multiply by 100.
What is the difference between percent and percentage points?
Percentage points measure the simple difference between two percentages, while percent change compares them proportionally.