256 Tools

Fraction Calculator

Enter fractions like 3/4, mixed numbers like 1 1/2, whole numbers or decimals like 0.75.

5/6
Decimal: 0.833333

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Add, subtract, multiply and divide two fractions and get the answer fully simplified, plus its mixed-number and decimal forms. It accepts fractions, mixed numbers, whole numbers and even decimals as input. Everything is calculated in your browser; nothing is uploaded.

How to use

  1. Type the first fraction (for example 3/4 or 1 1/2).
  2. Choose an operation: add, subtract, multiply or divide.
  3. Type the second fraction and read the simplified result.

How it works

To add or subtract, the fractions are put over a common denominator; to multiply, the numerators and denominators are multiplied; to divide, the second fraction is flipped and multiplied. The result is then reduced to lowest terms by dividing both parts by their greatest common divisor. For example, 1/2 + 1/3 becomes 3/6 + 2/6 = 5/6.

One half plus one third equals five sixths.1/2+1/3=5/6

Features

All four operations

Add, subtract, multiply and divide fractions in one place.

Auto-simplify

Results are always reduced to lowest terms automatically.

Mixed numbers

See the answer as a mixed number when it is greater than one.

Decimal form

Also shows the decimal value, handy for quick comparisons.

Flexible input

Accepts fractions, mixed numbers, whole numbers and decimals.

When to use it

Math homework

Check fraction answers and see them reduced to lowest terms.

Recipes

Combine or scale fractional measurements like 1/2 cup plus 1/3 cup.

DIY & measuring

Add up fractional inch measurements when cutting or building.

Ratios & probability

Work with fractional ratios and probabilities and keep them exact.

Notes

  • Mixed numbers use a space, like 1 1/2.
  • Dividing by zero is not allowed and shows an error.
  • Results are always shown in lowest terms.
  • All calculation runs on your device; nothing is uploaded.

FAQ

How do I enter a mixed number?
Write the whole part, a space, then the fraction — for example 1 1/2 for one and a half.
Does it simplify the answer?
Yes. Every result is automatically reduced to lowest terms using the greatest common divisor.
Can I enter decimals?
Yes. A decimal like 0.75 is converted to a fraction (3/4) before the calculation.
What happens if I divide by zero?
Division by zero is undefined, so the calculator shows an error instead of a result.
Is my data sent to a server?
No. All calculation happens locally in your browser.

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