Toolest

Percentage Calculator

Enter a value and a percentage to instantly get the percentage amount, the increased value and the decreased value.

Updates instantly as you type

percentage.txt
0% of 0 = 0
0 increased by 0% = 0
0 decreased by 0% = 0
0 is 0% of n/a (percentage cannot be 0 for this line)

01 / Fast steps

  1. Enter a base value.
  2. Enter a percentage.
  3. Read every common result instantly, updated as you type.

02 / Best for

  • Working out a discount or a markup while shopping or pricing a product.
  • Calculating a tip or a commission.
  • Checking how much a value grows or shrinks by a given percentage.

03 / Why here

  • Updates instantly as you type, no need to click run.
  • Covers the most common percentage questions in one place.
  • Runs entirely in your browser.

04 / Keep in mind

  • Rounds results to a reasonable number of decimal places for readability.

Tool connections

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Good to know

Questions & answers

01

How is "percentage increase" calculated?

It adds the percentage amount to the original value: value + (value × percentage ÷ 100).

02

Can I use negative numbers?

Yes, both the value and the percentage accept negative numbers.

03

Is Percentage Calculator free to use?

Yes, Percentage Calculator is completely free, with no sign-up and no usage limits. It runs entirely in your browser, so your data never leaves your device.