Free Percentage Calculator
A percentage calculator answers the common percent questions in one place: what is 15% of 800, what percent is 45 of 60, how much did a value change between two numbers, and what is a price after a 20% rise or discount. Pick the question, enter two numbers and read the result with the working shown underneath.
Percentage Calculator
Calculators and Converters
About this tool
Choose the question that matches your problem. "What is X% of Y" finds a share, such as a 18% tax on a bill or a 10% commission on a sale. "X is what percent of Y" turns a part and a whole into a percentage, for example 45 completed tasks out of 60. "Percentage change" compares an old value X with a new value Y and tells you the rise or fall as a percent of the old value, which is how growth in traffic, sales or price is normally reported.
Increase and decrease do the opposite job: they start from a value Y and apply a percentage X to get the new price or total. A 20% discount on 2,500 gives 2,000. Note that percentage changes do not cancel out. If a number rises 50% and then falls 50%, it ends 25% below where it started, because the fall is taken from a bigger base. The working shown under each answer makes that kind of step easy to follow.
For marketing reports, always say what the percentage is measured against. A click-through rate is clicks divided by impressions, a conversion rate is orders divided by visits, and a "20% increase in traffic" needs the old and new figures beside it. Showing the raw numbers next to the percentage keeps reports honest and easy for a client to check.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For 15% of 800 that is 800 times 15 divided by 100, which is 120. Choose "What is X% of Y" above, enter 15 and 800, and the tool shows the answer together with these steps.
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 80 to 100 is a rise of 20 on a base of 80, which is 25%. A negative answer means the value fell. The old value is always the base, so it must not be zero.
How do I find a price after a discount?
Choose "Decrease Y by X%", enter the discount as X and the original price as Y. The tool returns the sale price and the amount saved. For a 20% discount on 2,500 the sale price is 2,000 and the saving is 500. The same method works for adding a tax percentage with the increase option.
What is the difference between percent and percentage points?
A percent compares one value with another, while a percentage point is the plain arithmetic gap between two percentages. If a conversion rate goes from 2% to 3%, it rose by one percentage point, which is a 50% increase on the old rate. Reports should say which one they mean.
Can the result be more than 100%?
Yes. If the part is bigger than the whole, the answer exceeds 100%, for instance 150 is 250% of 60. A percentage change can also be above 100% when a value more than doubles. Only a decrease is limited, because a value cannot fall by more than 100% of itself.