Calculate fraction

Add, subtract, multiply, or divide two exact fractions and show the decimal approximation.

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ToolFraction Calculator
Input
Output
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Preview

How it works

Operands are parsed as integers or fractions, then the selected operation combines numerators and denominators. The greatest common divisor reduces the exact result before a six-place decimal approximation is appended.

  • The exact fraction is authoritative; decimal precision affects display only.
  • Division by zero is rejected.

Worked example

Add Fractions
Add 1/3 and 1/4 together
Input
											1/3 + 1/4
Output
												7/12 (0.5833333333333334)

When to use this

Recipes add cup fractions, construction plans subtract measurements, and math exercises compare exact results with decimals.

Edge cases

  • A negative denominator is normalized so equivalent fractions share one sign convention.
  • Multiplying improper fractions remains exact and is not converted to mixed form first.
  • Dividing by an operand with zero numerator is rejected because that operand represents zero.