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Fraction Calculator

Result

Result (fraction)3/4
Result (decimal)0.75
↗ Math

Fraction Calculator Popular Fraction Calculator is a mathematics calculator that helps you calculate fraction values from your input data. The formula used is: Reduce by dividing numerator and denominator by their GCD. Addition: a/b + c/d = (ad+bc)/(bd). — free online calculator.

Formula

Method: For a/b and c/d, compute reduced sum, difference, product, and—when c ≠ 0—quotient using common-denominator fraction arithmetic.
  • Fraction Calculator calculates its result from a, b, c, d. It uses the formula Calculated with the verified ST Calculator runtime.. Change any input to recalculate the result instantly.
  • The main inputs are Operation, Numerator — 1st fraction, Denominator — 1st fraction, Numerator — 2nd fraction, Denominator — 2nd fraction. Enter them in the units and format shown in the calculator.
  • Keep comparable quantities in compatible units whenever the formula combines or compares them.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Fraction

Inputs
  • Operation: simplify
  • Numerator — 1st fraction: 3
  • Denominator — 1st fraction: 4
  • Numerator — 2nd fraction: 1
  • Denominator — 2nd fraction: 2

Using a = 1, b = 2, c = 1, d = 3, the calculated result is sum: 5/6 | difference: 1/6 | product: 1/6 | quotient: 3/2.

Sample result: Calculating…

Frequently asked questions

What does the Fraction calculate?

Fraction Calculator Popular Fraction Calculator is a mathematics calculator that helps you calculate fraction values from your input data. The formula used is: Reduce by dividing numerator and denominator by their GCD. Addition: a/b + c/d = (ad+bc)/(bd). — free online calculator.

Which values should I enter?

Enter Operation, Numerator — 1st fraction, Denominator — 1st fraction, Numerator — 2nd fraction, Denominator — 2nd fraction using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: Method: For a/b and c/d, compute reduced sum, difference, product, and—when c ≠ 0—quotient using common-denominator fraction arithmetic..

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 10, 2026