Percentage Calculator
Calculate percentages, discounts, markups, and VAT instantly in your browser. Free online tool, no data upload, 100% private.
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Enter values to calculate.
Features
100% Browser-Based
All calculations happen in your browser. Your data never leaves your device.
Free & No Sign Up
No registration, no limits, no hidden fees. Just open and use.
Instant Results
Get percentage results in real time as you type, zero waiting.
Multiple Calculation Modes
Calculate what is X% of Y, X is what % of Y, and percentage change from X to Y — all in one tool.
Frequently Asked Questions
Is my data sent to any server?
No. All calculations happen entirely in your browser using JavaScript. Your input values never leave your device.
How do I calculate a discount?
Enter the original price and the discount percentage. The tool will instantly show the discount amount and the final price after discount.
What is the difference between markup and margin?
Markup is the percentage added to the cost to get the selling price, while margin is the percentage of the selling price that is profit. They are calculated differently and produce different results.
Can I calculate VAT with this tool?
Yes. Enter the net amount and the VAT rate to calculate the VAT amount and the gross (VAT-inclusive) price, or reverse-calculate the net from the gross.