Fractions Calculators

icon of fractions being calculated on board

Use the first calculator to add, subtract, multiply or divide fractions. Use the second calculator to simplify fractions, using the greatest common factor. Finally, use the third calculator to convert a decimal to a fraction. Should you need any help with calculating fractions manually, please see the information at the bottom of this page.

Calculate using mixed fractions

Simplify a fraction

Convert a decimal number to a fraction


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Whilst every effort has been made in building this fractions calculator, we are not to be held liable for any special, incidental, indirect or consequential damages or monetary losses of any kind arising out of or in connection with the use of the converter tools and information derived from the web site. This fractions calculator is here purely as a service to you, please use it at your own risk. Do not use calculations for anything where loss of life, money, property, etc could result from inaccurate conversions.

Please see the full disclaimer for more information.

How to use repeating decimals

My decimal to fraction calculator (featured in the third tab above) gives you the ability to enter repeating decimals by utilising the 'Number of trailing decimal places to repeat' box. To use it, simply enter the number of digits from the end of the decimal to repeat. For other non-repeating decimals, keep the default value at 0.

As an example, if you want to convert a repeating decimal such as 1.5476... then you should enter 1.5476 into the Decimal box and 4 into the Number of trailing decimal places to repeat box (signifying that the last 4 digits of the number should repeat).

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faq icon

How to calculate fractions - FAQ

I've been asked to provide some information about how the fractions calculator works out its results. So, I've included the formulae below along with some examples. Note that you need to have JavaScript enabled in your browser for these fractions to appear correctly.

Fractions on dice

Adding fractions

The formula for adding fractions is:

\( \dfrac{a}{b} + \dfrac{c}{d} = \dfrac{ad + bc}{bd} \)

An example:

\( \dfrac{2}{3} + \dfrac{1}{4} = \dfrac{(2\times4) + (3\times1)}{3\times4} = \dfrac{11}{12} \)

Subtracting fractions

The formula for subtracting fractions is:

\( \dfrac{a}{b} - \dfrac{c}{d} = \dfrac{ad - bc}{bd} \)

An example:

\( \dfrac{2}{3} - \dfrac{1}{4} = \dfrac{(2\times4) - (3\times1)}{3\times4} = \dfrac{5}{12} \)

Multiplying fractions

The formula for multiplying fractions is:

\( \dfrac{a}{b} \times \dfrac{c}{d} = \dfrac{ac}{bd} \)

An example:

\( \dfrac{2}{3} \times \dfrac{1}{4} = \dfrac{(2\times1)}{(3\times4)} = \dfrac{2}{12} = \dfrac{1}{6} \)

Dividing fractions

The formula for dividing fractions is:

\( \dfrac{a}{b} \div \dfrac{c}{d} = \dfrac{ad}{bc} \)

An example:

\( \dfrac{2}{3} \div \dfrac{1}{4} = \dfrac{(2\times4)}{(3\times1)} = \dfrac{8}{3} \)

To learn how to calculate fractions using these formulae, take a look at our article how to add, subtract, multiply and divide fractions.

If you would like help with converting between decimals and fractions, see our article how to convert a decimal to a fraction.

If you have any problems using my fractions calculator tool, or any suggestions, please contact me.