6 calculators in this category
- Percentage CalculatorBase-100 proportion identityEvery percentage question is one of three questions, and this calculator answers all three at once. Enter a percent and a whole…
- Percentage Change CalculatorRelative change on the earlier value as basePercent change measures how far a value has moved relative to where it started. Enter the earlier figure and the later figure…
- Percentage Increase & Decrease CalculatorMultiplicative percentage adjustmentApplying a percentage is a multiplication, not an addition. To raise a value by 20% you multiply by 1.20; to cut it by 20% you…
- Reverse Percentage CalculatorThis calculator recovers the number you started with. Give it a value that has already had a percentage applied — a sale…
- Percentage Difference CalculatorPercentage difference compares two numbers when neither one is the baseline. It divides the gap between them by their mean…
- Percent Error CalculatorJCGM 100:2008 (GUM)Enter what you measured and what the value should have been, and this calculator returns the absolute error, the relative error…
Which one do you need?
- Percentage Calculator
- Work out what X% of a number is, what percent one value is of another, and the whole from a part. Three percentage answers, with every step shown.
- Percentage Change Calculator
- Find the percent change between two values, the absolute difference, and the reverse change that undoes it. Works with negative numbers and shows the steps.
- Percentage Increase & Decrease Calculator
- Add or subtract a percentage from any starting value, repeat it over several periods, and see the multiplier, the amount of change and how to undo it.
- Reverse Percentage Calculator
- Work backwards from a price after a discount or markup to the original value, or find the whole from a part and its percent. Formula, steps and examples.
- Percentage Difference Calculator
- Compute the symmetric percentage difference between two numbers using their mean, plus the absolute difference and how it compares with percent change.
- Percent Error Calculator
- Calculate percent error, absolute error and relative error from a measured and an accepted value. Shows the formula, the steps and a tolerance table.