Free Percentage Calculator: Percent Of and Change

Free tool · nothing is uploaded

Free percentage calculator

Work out a percent of a number, what percent one number is of another, and the change from one number to another. The numbers stay in your browser.

Fifteen percent of 80 shown as the result 12.
The picture is one example. The three forms below are the calculator.

Percent of a number

% of

What percent

is what percent of

Change

to

How each result is calculated

  1. A percent of a number is the percent divided by 100, then multiplied by the number. 15% of 80 is 12.
  2. What percent one number is of another is the part divided by the whole, then multiplied by 100. 20 is 25% of 80. The whole cannot be 0.
  3. Change is the new number minus the starting number, divided by the starting number, then multiplied by 100. From 80 to 100 is an increase of 25%. From 100 to 80 is a decrease of 20%. The starting number cannot be 0.
  4. A comma is treated as a thousands separator, so 1,000 is 1000. The decimal mark is a point. A result that is not a short decimal is shown to 4 decimal places.

These are arithmetic results. They are not a price, a tax, or a forecast. Two people who type the same numbers see the same results.

Questions about this calculator

How do you calculate a percent of a number?

Divide the percent by 100, then multiply by the number. 15% of 80 is 15 divided by 100, times 80, which is 12.

How do you find what percent one number is of another?

Divide the part by the whole, then multiply by 100. 20 is 25% of 80. The whole cannot be zero.

How do you calculate a percentage change?

Subtract the starting number from the new number, divide by the starting number, then multiply by 100. From 80 to 100 is an increase of 25%. From 100 to 80 is a decrease of 20%. The starting number cannot be zero.

Does this tool upload what I type?

No. The numbers stay in the browser. Blogoose does not receive them.