How to Use
- 1.
Choose the calculation type, such as X% of Y, percentage change, or percentage difference.
- 2.
Enter the first value and second value shown by the labels.
- 3.
Review the result, formula, and short explanation.
- 4.
Use quick examples to test common discount, growth, and comparison scenarios.
- 5.
Copy the result summary if you want to paste it into a note, report, or message.
- 6.
Reset the calculator to start again with the default example.
Features
Find X percent of any number
Calculate what percent one value is of another
Percentage increase and decrease calculator
Add or subtract a percentage from a number
Percentage difference between two values
Formula and explanation for every result
Quick examples for discounts and growth
Copyable percentage summary
Private browser-based calculation
Frequently Asked Questions
How do I calculate what is X percent of Y?+
Choose What is X% of Y, enter the percentage as the first value and the number as the second value. The calculator uses X divided by 100 multiplied by Y.
How do I calculate percentage increase or decrease?+
Choose Percentage increase/decrease, enter the original value and the new value. The tool calculates the change divided by the original value, multiplied by 100.
What is the difference between percentage change and percentage difference?+
Percentage change uses an original value as the base. Percentage difference compares two values using their average as the base, which is useful when neither value is the starting point.
Can I use this calculator for discounts?+
Yes. Choose Subtract percentage from number, enter the original price and discount percentage, and the tool will estimate the reduced price.
Can I add tax or markup to a price?+
Yes. Choose Add percentage to number, enter the base price and percentage to add. For VAT-specific calculations, use the VAT Calculator.
Are my numbers stored?+
No. The percentage calculation runs locally in your browser and the tool does not upload or store your numbers.
About this tool
Free Percentage Calculator
Use the free WebToolsEdge Percentage Calculator to calculate common percentage questions quickly and accurately. You can find what is X percent of Y, calculate what percent one number is of another, measure percentage increase or decrease, add a percentage to a number, subtract a percentage from a number, and compare two values with percentage difference. This percent calculator is useful for discounts, sale prices, VAT and tax checks, profit margins, price changes, growth rates, marks, finance estimates, business reports, analytics changes, and everyday math. Instead of remembering several different formulas, choose the calculation type, enter two values, and the tool shows the result, formula, and a plain-language explanation. The percentage increase and decrease mode compares an original value with a new value. This is helpful when checking revenue growth, traffic changes, price increases, weight change, score improvement, or month-over-month reporting. The percentage difference mode compares two values using their average as the base, which is useful when there is no clear original value. For shopping, invoices, and pricing, use the add percentage and subtract percentage modes. Add percentage can estimate markup, tax, fees, or service charges. Subtract percentage can estimate discounts, reductions, markdowns, or sale prices. If you need country-specific tax handling, use the VAT Calculator as a dedicated follow-up tool. All calculations run in your browser. No values are uploaded or stored by WebToolsEdge. Results are rounded for display, so always confirm the final rounding method for official invoices, tax returns, financial records, or school submissions.
Calculating tax on a price? Use the dedicated VAT Calculator for adding or removing included VAT. For business margins and markup checks, compare revenue and costs with the Profit Calculator, or browse all Calculators.