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Adding Fractions Calculator

Result

Calculated result 3.6666666667 Based on the values entered.
↗ Math

Adding Fractions Calculator The Adding Fractions Calculator adds two fractions and returns the sum as a fraction reduced to its lowest terms, along with the decimal value. Enter the numerator and denominator of each fraction and it finds a common denomina — free online calculator.

Formula

a/b + c/d = (a×d + c×b) / (b×d), then reduced
  • Adding Fractions Calculator calculates its result from B, D, A, C. It uses the formula a/b + c/d = (a×d + c×b) / (b×d), then reduced. Change any input to recalculate the result instantly.
  • The main inputs are B, D, A, C. 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: Adding Fractions

Inputs
  • B: 2
  • D: 3
  • A: 4
  • C: 5

Using B = 2, D = 3, A = 4, C = 5, the calculated result is 3.6666666667.

Sample result: Calculating…

Frequently asked questions

What does the Adding Fractions calculate?

Adding Fractions Calculator The Adding Fractions Calculator adds two fractions and returns the sum as a fraction reduced to its lowest terms, along with the decimal value. Enter the numerator and denominator of each fraction and it finds a common denomina — free online calculator.

Which values should I enter?

Enter B, D, A, C using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: a/b + c/d = (a×d + c×b) / (b×d), then reduced.

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 7, 2026