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Fraction Calculator

Add, subtract, multiply or divide fractions and mixed numbers, with exact answers and steps

Examples: 3/4, 1 1/2, -2, 0.125. Up to 12 digits per integer part, numerator and denominator; up to 6 decimal places.

Operation

Separate a mixed number with a space: 1 1/2. A minus sign applies to the whole mixed number: -1 1/2 means −(1 + 1/2). Use a positive denominator.

Your inputs are calculated in your browser.

What this tool does

Use this free fraction calculator to add, subtract, multiply, divide or simplify fractions with worked steps. It accepts mixed numbers, whole numbers and finite decimals, then shows an exact fraction in lowest terms alongside a mixed number and decimal. Integer arithmetic preserves the rational result, making it useful for checking schoolwork or scaling a recipe without introducing floating-point rounding into the answer.

Common use cases

  • Check fraction homework and see the common denominator
  • Scale recipe quantities written as mixed numbers
  • Convert a finite decimal measurement to a simplified fraction

How to use it

  1. Enter the first fraction, mixed number, integer or decimal.
  2. Choose an operation and enter the second number when needed.
  3. Select Calculate to see the exact answer and working steps.
  4. Copy the result to keep it in your notes.

Input and output example

Input: 1 1/2 + 3/4
Output: 3/2 + 3/4 = 9/4, or 2 1/4 as a mixed number and 2.25 as a decimal.

Important notes

  • Use up to 12 digits in each integer part, numerator and denominator, or up to 6 decimal places. Scientific notation and repeating-decimal notation are not accepted.
  • Separate mixed numbers with a space and keep their fractional part below one. A leading minus applies to the entire mixed number. Denominators must be positive.
  • Decimals are truncated after 10 places with an ellipsis when more digits remain. The fraction result stays exact.
  • Your inputs are processed in your browser and are not autosaved.

Frequently asked questions

Can I just simplify a fraction?
Choose Simplify / convert to fraction. For example, 6/8 becomes 3/4 and 0.125 becomes 1/8. You do not need a second number.
What does a negative mixed number mean?
-1 1/2 means −(1 + 1/2), which is −1.5. The sign applies to both the whole and fractional parts.
Does an ellipsis mean the decimal repeats?
It only means more than 10 decimal places are needed. Both repeating decimals and longer terminating decimals can have an ellipsis. Use the fraction for the exact value.