Percentage Calculator

To help people understand and use percentages, we here at Some Blog Site have provided a Percentage Calculator to demonstrate how percentages work.

Here are some basic instructions for working with percentages.  “X” means number, “Y” means another number, and “%” means the percentage.  The calculator will do all these for you, but in case you want to learn how it works, we are listing the equations.

Description Equation
To take a percentage of a number, multiply the number by the percentage and divide by one hundred. X * % / 100
To get a percentage more than a number (percent increase, what is % more than X), take the percentage of the number and then add the result to the original number. (X * % / 100) + X
Another way of doing the same thing is to add one hundred to the percentage first, then multiply the number by that new percentage and divide by one hundred. (X * (% + 100)) / 100
To get a percentage less than a number (percent decrease, what is % less than X), take the percentage of the number and then subtract the result from the original number. X - (X * % / 100)
Another way of doing the same thing is to subtract one hundred from the percentage first, then multiply the number by that new percentage and divide by one hundred. (X * (100 - %)) / 100
To find how much of a percentage a number is of another number, divide a number by another number and multiply by one hundred. % = (X / Y) * 100
  • The equation for inverting a percent loss is this: % / (1 - (% / 100))
    An example of this is 30%.  Take 1 - 0.3 and get 0.7 and divide them (30% / 0.7) and you get 42.85%.  So come out even after a 30% loss, you need a 42.85% gain.
  • The equation for inverting percent gain is this: % / (1 + (% / 100))
    An example of this is 42.85%.  Take 1 + 0.4285 and get 1.4285 and divide them (42.85% / 1.4285) and you get 30%.  So to come out even after a 42.85% gain, you need a 30% loss.

Again, please visit the calculator for more fun with percentages.

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2 Responses to “Percentage Calculator”

  1. See Here Says:

    Hi, will you please help me finding some good scripts of online calculators? I’ve been searching for such a lot now, but have found just some of the widgets that I need. Very cool site you have, by the way, congrats about that. HEre I found some very useful info and online widgets. Do you write the scripts yourself, or purchase them from somewhere?

  2. Some Guy Says:

    I wrote the calculators myself, thanks.

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