Free Math Browser tool

Percentage Calculator

Calculate a percentage of a number, add or subtract a percentage, and find the resulting amount quickly.

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Quick facts

  • Best for
    fast everyday workflows
  • Result
    copy-and-paste output
  • Note
    Runs in your browser with no sign-up required.

About this Tool

Enter an amount and a percentage to calculate the percentage value and the amount after adding it.

Why people use this tool

  • Works for prices, tax, tips, discounts, budgets, and general math.
  • Shows both the percentage portion and the final total.
  • Uses decimal arithmetic so currency-like values remain precise.

How to use it

  1. Enter the original number or amount.
  2. Enter the percentage rate.
  3. Select Calculate to see the percentage amount and total.