Math & Everyday
Fraction Calculator
Add, subtract, multiply, or divide two fractions.
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CalcoTools · Fraction Calculator · generated 8/23/2026, 1:05:11 PM
About the Fraction Calculator
Adds, subtracts, multiplies, or divides two fractions and simplifies the result to lowest terms, also showing the decimal equivalent.
How to use it
- Enter the first fraction's numerator and denominator.
- Choose an operator (+, −, ×, ÷).
- Enter the second fraction's numerator and denominator.
- Read the simplified result and decimal equivalent in the readout.
Formula
Addition/subtraction: a/b ± c/d = (ad ± bc)/bd
Multiplication: (a/b)×(c/d) = ac/bd
Division: (a/b)÷(c/d) = ad/bc
Simplify by dividing both parts by their greatest common divisor.
Worked example
1/2 + 1/3 = (1×3 + 1×2)/(2×3) = 5/6.
Recommendations
- • Enter whole numbers as a fraction over 1, like 5/1, if you need to mix whole numbers with fractions.
- • The result simplifies automatically — no need to reduce by hand first.
- • For a fraction of a specific number rather than fraction arithmetic, use the Percentage Calculator instead.
Frequently asked questions
You can enter any fraction, even an unreduced one — the calculator always simplifies the final result automatically.