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Percentage Calculator

Solve percentage of a number, what-percent, increase, decrease, change, reverse percentage and marks percentage calculations.

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Quick answer

Percentage Calculator: Percentage Calculator solves common percentage problems including percent of a number, reverse percentage, increase, decrease, change and percentage difference.

OutputCalculated result with the formula used.
Best for
Discount and marks calculationsFinding percentage increase or decreaseComparing two values
Tool

Percentage Calculator

No signup
Percentage Calculator SuiteSolve percentage values, changes, increases, decreases and reverse percentages.
8 calculation modesFormula shown
Result—
Difference—
Direction—
Rounded—
Choose a calculation mode.

About Percentage Calculator

Percentage Calculator handles several common percentage problems in one workspace. Find a percentage of a value, calculate what percentage one number is of another, apply an increase or decrease, measure percentage change, reverse a percentage to estimate the original value, or calculate marks percentage. The result includes the formula with the values substituted so it can be checked or explained.

Choose the correct mode because similar questions use different denominators. Percentage change compares the difference with the original value, while a value after a discount or increase may require reverse-percentage mode. A 20 percent increase followed by a 20 percent decrease does not return to the starting value because the second calculation uses a different base. Use enough decimal precision for financial or scientific work and apply the rounding rule required by the final document.

How to use Percentage Calculator

  1. 1Choose the percentage question you need to solve.
  2. 2Enter the required values in the labelled fields.
  3. 3Select Calculate.
  4. 4Review the result and the worked formula.
  5. 5Copy the answer with suitable rounding for your task.

Features

Percentage of a number
What-percent calculation
Percentage increase or decrease
Percentage change
Reverse percentage
Marks percentage
Worked formula and copyable result

Examples

Example 1Find 18 percent of an invoice subtotal.
Example 2Calculate the percentage increase from 80 to 100.
Example 3Find the original price before a 25 percent discount.
Continue your workflow

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Frequently asked questions

What is the formula for percentage change?

Subtract the original value from the new value, divide by the original value and multiply by 100.

Why do equal percentage increase and decrease not cancel out?

The decrease is calculated from the new, changed value rather than the original base.

Can the calculator handle decimal values?

Yes. Enter decimals and use the displayed result at the precision suitable for your task.

What happens if the denominator is zero?

The percentage is undefined, so the tool should show a validation message instead of a numeric result.