Percentage Calculator
Compute percentage of numbers, percentage increases/decreases, ratios, and taxes or discounts in real-time.
What is X% of Y?
X is what % of Y?
% Change from X to Y
Add/Subtract % (e.g. Tax / Discount)
100% Local Browser Privacy
All computation happens right in your browser's JavaScript engine. No data is ever sent to any remote server.
Instant Results
Zero network latency. Calculations and formatting are executed instantly with high cryptographic and mathematical precision.
Works Offline
Once loaded, this tool can function completely offline with no active internet connection required.
Frequently Asked Questions
How do I calculate a discount?
Use the 'Add/Subtract %' sub-calculator with the original price and discount percentage.
What is the formula for percentage change?
Percentage change = ((New Value - Old Value) / |Old Value|) * 100%.
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