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Fraction Calculator

Add, subtract, multiply and divide fractions, with the result simplified.

To calculate with fractions, enter two fractions and choose an operation. Addition and subtraction use a common denominator, multiplication multiplies across, and division multiplies by the reciprocal. The answer is reduced and also shown as a mixed number, decimal and percentage.

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Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Why do fractions need a common denominator to add?

Because the denominator defines the size of each part. Adding thirds to quarters is adding two different units — converting both to twelfths makes the parts the same size, and only then can the numerators be added.

What is an improper fraction?

One whose numerator is at least as large as its denominator, such as 7/4. It is perfectly valid and often easier to compute with than the mixed number 1¾, which is why calculators work in improper form and convert only at the end.

How to use the fraction calculator

  1. 1Enter or paste your first fraction.
  2. 2Choose the operation.
  3. 3Enter or paste your second fraction.
  4. 4The result appears immediately — copy or download it.

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Put the working fraction calculator on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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