Math & School

Fraction Calculator

Add, multiply, divide and reduce fractions - with arithmetic.

Updated on Apr 21, 2026 Calculator, calculation path and examples on one page

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Calculator

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Calculation path

Step by step

  1. Form a common denominator

    Result: 12

  2. Add counters

    Result: 11/12

Instructions

How to use this calculator correctly

How to use the calculator

  • Select mode.
  • Enter fractions.
  • When expanding, also specify the factor.

Common mistakes

  • Enter denominator 0.
  • When dividing, don't think about the reverse fraction.

Limits of the calculation

  • The calculator works with integers for the numerator and denominator.

Related guide: Solve the rule of three, percentage calculations and fractions in an understandable way

Examples

Typical calculations

FAQ

Frequently asked questions

What does shortening mean?

The numerator and denominator are divided by the same common divisor.

Why do you often need a common denominator when adding?

Because only fractions with the same name can be added or subtracted directly.

How does dividing fractions work?

You multiply by the inverse fraction of the second fraction.

Does the calculator also show abbreviated results?

Yes, the output is always shortened as much as possible.

Is there also a decimal representation?

Yes, a decimal number is also output.

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Sources and notes

Rule status and context

methodology
The calculator uses gcd for abbreviation and kgv for common denominators.