Percentage Calculator

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What  is   %\hspace{0.2em} \%\, of  ?\hspace{0.2em} \,?

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About the Percentage Calculator

This percentage calculator lets you calculate what percent a certain value is of the base (total value). In fact, if you know any two of the three (percent, value, base), it can calculate the unknown for you.

The calculator will give you not just the answer, but also the step by step solution.

Usage Guide

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i. Valid Inputs

Each input can be a real number in any format — integers, decimals, fractions, or even mixed numbers. Here are a few examples.

  • Whole numbers or decimals → 2\hspace{0.2em} 2 \hspace{0.2em}, 4.25\hspace{0.2em} -4.25 \hspace{0.2em}, 0\hspace{0.2em} 0 \hspace{0.2em}, 0.33\hspace{0.2em} 0.33 \hspace{0.2em}
  • Fractions → 2/3\hspace{0.2em} 2/3 \hspace{0.2em}, 1/5\hspace{0.2em} -1/5 \hspace{0.2em}
  • Mixed numbers → 51/4\hspace{0.2em} 5 \hspace{0.5em} 1/4 \hspace{0.2em}

ii. Example

If you would like to see an example of the calculator's working, just click the "example" button.

iii. Solutions

As mentioned earlier, the calculator won't just tell you the answer but also the steps you can follow to do the calculation yourself. The "show/hide solution" button would be available to you after the calculator has processed your input.

iv. Share

We would love to see you share our calculators with your family, friends, or anyone else who might find it useful.

By checking the "include calculation" checkbox, you can share your calculation as well.

Here's a quick overview of percentage and a few related concepts.


Percentage is a common way of expressing a fraction or ratio as a quantity out of hundred.

And just like fractions or ratios, percentages are used to compare two quantities. Here's an example.

Here's an example. Say there are 50\hspace{0.2em} 50 \hspace{0.2em} marbles in a box and 6\hspace{0.2em} 6 \hspace{0.2em} of those marbles are blue.

And if we wanted to say what portion of the marbles are blue, we could say 6\hspace{0.2em} 6 \hspace{0.2em} out of 50\hspace{0.2em} 50 \hspace{0.2em}. Or 12\hspace{0.2em} 12 \hspace{0.2em} out of 100\hspace{0.2em} 100 \hspace{0.2em}. Imagine two such boxes of marbles.

Now, instead of saying 12\hspace{0.2em} 12 \hspace{0.2em} out of 100\hspace{0.2em} 100 \hspace{0.2em}, we could just say 12\hspace{0.2em} 12 \hspace{0.2em} percent (written as 12%\hspace{0.2em} 12 \% \hspace{0.2em}).

Percent simply means out of 100\hspace{0.2em} 100 \hspace{0.2em}. So, 20%\hspace{0.2em} 20 \% \hspace{0.2em} is another way of saying 20\hspace{0.2em} 20 \hspace{0.2em} out of 100\hspace{0.2em} 100 \hspace{0.2em}.

Percentage Formula

When working with percentages, there are three quantities we need to keep in mind — total, part, and percent.

Going back to the previous marbles example,

  • the "total" was 50\hspace{0.2em} 50 \hspace{0.2em} (there were 50\hspace{0.2em} 50 \hspace{0.2em} marbles in all),
  • "part" was 6\hspace{0.2em} 6 \hspace{0.2em} (we were concerned with the blue marbles and there were 6\hspace{0.2em} 6 \hspace{0.2em} of them),
  • and "percent" was 20\hspace{0.2em} 20 \hspace{0.2em}.

Moving ahead, the percent formula that connects the three quantities is as follows.

percent=partwhole×100%\text{percent} \hspace{0.25em} = \hspace{0.25em} \frac{\text{part}}{\text{whole}} \times 100 \hspace{0.2em} \%

We can rearrangle the above formula and make "part" the subject of the formula.

part=percent100×whole\text{part} \hspace{0.25em} = \hspace{0.25em} \frac{\text{percent}}{100} \times \text{whole} \hspace{0.2em}

Let's look on a couple of example problems to see this formula in action.

Percentage Calculation — Examples


In a class of 30\hspace{0.2em} 30 \hspace{0.2em} students, there are 12\hspace{0.2em} 12 \hspace{0.2em} boys and 18\hspace{0.2em} 18 \hspace{0.2em} girls. What percentage of the class do girls represent?


We can find the percentage of girls using the formula we saw earlier, we have

% of girls=number of girlsnumber of students×100%=1830×100%=60%\begin{align*} \% \text{ of girls} \hspace{0.25em} &= \hspace{0.25em} \frac{\text{number of girls}}{\text{number of students}} \times 100 \hspace{0.2em} \% \\[1.75em] &= \hspace{0.25em} \frac{18}{30} \times 100 \hspace{0.2em} \% \\[1.75em] &= \hspace{0.25em} 60 \hspace{0.2em} \% \end{align*}

So, girls form 60%\hspace{0.2em} 60 \hspace{0.1em} \% \hspace{0.2em} of the class.


How much is 15%\hspace{0.2em} 15 \% \hspace{0.2em} of 30\hspace{0.2em} 30 \hspace{0.2em}?


This time, we'll need to use the second formula — the one for "part".

part=percent100×whole\text{part} \hspace{0.25em} = \hspace{0.25em} \frac{\text{percent}}{100} \times \text{whole}

Substituting the values, we get

15%of30=15100×30=4.5\begin{align*} 15 \hspace{0.15em} \% \hspace{0.5em} \text{of} \hspace{0.5em} 30 \hspace{0.25em} &= \hspace{0.25em} \frac{15}{100} \times 30 \\[1.75em] &= \hspace{0.25em} 4.5 \end{align*}

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