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Percentage calculator

A free percentage calculator with three questions in one place: what is X percent of Y, X is what percent of Y, and the percent change from one number to another. Fill in the two numbers of a row and the answer appears at once.

How to calculate a percentage

  1. 1Pick the row that matches your question
  2. 2Type the two numbers
  3. 3Read the answer on the right
  4. The answer for each row, updated as you type.

What you get

  • Three answers at once.All three rows work side by side, so you can compare.
  • Updates as you type.There is no button to press.
  • Increase or decrease.A change gets a plus or minus sign in front.

What you can do

  • Find a part: "What is (%) of" gives X percent of Y, for example 15 % of 80 is 12.
  • Find a share: "is what % of" tells you what percent the first number is of the second.
  • Find a change: "Change from" and "to" give the percent change, with a plus for a rise and a minus for a fall.
  • Use decimals, such as 7.5 or 0.25, and negative numbers.

Good to know

  • The change is measured from the first number. Going from 50 to 75 is +50 %, but going from 75 to 50 is -33.33 %.
  • A row shows a dash until both of its numbers are filled in.
  • A change from 0 has no percent, because it cannot be divided by zero.
  • Nothing you type leaves your browser.

Questions

How do I calculate X percent of a number?

Use the first row. Type the percent and the number, and the answer shows on the right. 20 % of 150 is 30.

How do I work out a percent increase?

Use the last row. Type the old number under "Change from" and the new one under "to". The answer has a plus for a rise.

What percent is one number of another?

Use the middle row. Type the part, then the whole. 30 is 20 % of 150.

Is it free?

Yes. It is free and needs no account.

How it works

Small tools that run in your browser.

Four steps

  1. Start with a file or a task

    Drop a file, search, or pick a task.

  2. The tool opens in a window

    Open as many as you like, side by side as tabs.

  3. Results collect on the right

    Drag a result into the next tool.

  4. Save when you're done

    Saved files go to your downloads.

Who uses what

Tool sets for common jobs.

Put a tool on your home screen

The icon opens that tool, like an app.

iPhone and iPad

  1. Open the tool in Safari.
  2. Tap Share (the square with the arrow).
  3. Choose “Add to Home Screen”, then Add.

Android

  1. Open the tool in Chrome.
  2. Tap the menu (⋮) at the top right.
  3. Choose “Add to Home screen” or “Install app”.

Computer

  1. Open the tool in Chrome or Edge.
  2. Click the install icon in the address bar.
  3. Choose Install.

Skills

Claude skills we use ourselves, one job each.