| Your question | Calculator |
|---|---|
| You know a percentage and a number, or two numbers | Percentage calculator |
| A value went from an old number to a new one | Percentage change |
| Two values, and neither one is the starting point | Percentage difference |
| You know the value after a % was added or taken off | Reverse percentage |
| A price with a discount, or two discounts in a row | Discount |
| A bill and a tip, maybe split between people | Tip |
| A salary and a raise | Salary increase |
| A cost and a selling price: profit as % of the price | Margin |
| A cost and a selling price: profit as % of the cost | Markup |
| Marks in one test or several subjects | Marks percentage |
| Several percentages to combine into one | Average percentage |
| A measurement compared with the true value | Percent error |
| A fraction or a decimal to turn into a percentage | Fraction to percent |
All calculators
Change & compare
Enter the old and the new value to get the percent change, with the steps.
Percentage increase calculator
Find the percentage increase between two numbers, or increase a number by a percentage.
Percentage decrease calculator
Find the percentage decrease between two numbers, or decrease a number by a percentage.
Percentage difference calculator
Compare two values when neither one is the starting point.
Find the original value before a percentage was added or taken off.
Money
See the sale price and how much you save, including stacked discounts.
Work out a new salary after a raise, or the percentage of the raise you got.
Find the tip, the total and each person’s share.
Find the profit margin from cost and price, or the price for a target margin.
Find the markup from cost and price, or the price for a given markup.
School & science
Average several percentages, weighted by their totals when they differ.
Turn marks (test scores) out of any total into a percentage, for one test or many subjects.
Compare a measured value with the true or accepted value.
Conversions
Fraction to percent calculator
Convert any fraction to a percentage, with the division shown.
Turn a decimal into a percentage by multiplying by 100.
Percent to fraction calculator
Write any percentage as a fraction in its simplest form.