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Money & CalculatorsFree online tool
Use this calculator to answer common percentage questions without doing the arithmetic by hand.
Calculator results are estimates. Check important financial, tax or market figures against the relevant current official source or professional advice.
Enter the values you want to calculate, then review the estimate below.
Related guideCalculation Guide
Learn how to calculate a percentage, find what percentage one number is of another, and work out percentage increases and decreases with simple examples.
Read guideUse the controls above, check the result, then copy or download it when available.
Yes. Choose % change and enter the starting value (A) and the new value (B) to get (B - A) / A x 100. Choose A is % of B to find what percent one number is of another, or use Increase and Decrease to apply a percentage to a value.
Use this tool whenever you need: Comparing a percentage change, finding a percentage of a value, or checking a result before using it elsewhere. It offers a fast, client-side workflow without sign-ups, installation or complex software.
Yes. All processing executes locally in your browser using client-side JavaScript. Your inputs, files and calculations remain private and are never uploaded to our servers.
Enter the original value and the percentage carefully; an increase and a decrease use different reference values. Important note: The tool performs arithmetic only and does not interpret taxes, fees or business rules.
Everyday calculator
Work out a percentage, an increase or decrease, what percent one number is of another, or the percentage change between two values.
1. Enter your numbers
Quick percentage
Choose a common rate or type your own.
2. Choose the operation
Find, add or subtract a percentage, or compare two values.
3. Your result
20% applied
Result
100
20% of 500
Copy the exact calculation for sharing or saving.
Calculated instantly in your browser. For increase and decrease modes, the displayed change is the percentage amount added to or subtracted from the starting value. “A is % of B” shows A ÷ B × 100, and “% change” shows (B − A) ÷ A × 100 measured against the starting value A.