Percentage Calculator
What is P% of N, percent change, discounts, and sales tax — fast answers, no upload.
What is P% of a number?
Result
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How to use this tool
- Pick a mode: % of, Is what %, Change, Discount, or Tax.
- Enter the two numbers (for Tax, choose Add tax or Tax included).
- Read the live result — use Copy when you want it on the clipboard.
Everyday percent math — including simple tax
Most people need the same answers: a percentage of a value, relative size, growth or drop, a discount, and “what’s the total with tax?” or “what was the price before tax?” DevDock covers those without country tax tables, loans, or compound interest.
Converting length, weight, or temperature instead? Try the Unit Converter. Focused tax or discount pages: Sales Tax Calculator and Discount Calculator.
FAQ
What can this calculator do?
Five everyday jobs: what is P% of a number, one number as a percent of another, percent change, discounts, and sales tax (add tax or back out tax from an inclusive price).
How does Tax mode work?
Add tax: enter the price before tax and the tax %. You get the tax amount and the total. Tax included: enter a price that already has tax and the rate — you get the pre-tax price and the tax amount.
How do I calculate a tip?
Use % of — enter the tip percent and the bill total (for example 18% of 64). Or use Add tax with the tip percent if you want bill + tip as a total.
Why can’t percent change start from zero?
Percent change divides by the starting value. Starting at 0 makes that undefined — there is no meaningful “percent of zero.”
Are my numbers uploaded?
No. All math runs in your browser. Nothing is sent to a server.
Does this do country tax tables or loans?
No. No VAT/GST country lists, compound interest, or amortisation — just the percent math people need every day.
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