Fraction Calculator
Add, subtract, multiply, or divide two fractions — reduced result and decimal.
About Fraction Calculator
Fraction Calculator adds, subtracts, multiplies, and divides two fractions, returning the result as a reduced fraction and as a decimal. It is the right tool for the everyday math that comes up in cooking (combining recipe quantities), DIY projects (board lengths and material counts), and homework — the cases where a decimal calculator rounds and loses the exact form.
Worked example: type 1 in Numerator 1, 3 in Denominator 1, '+' in the operation, 1 in Numerator 2, 4 in Denominator 2, and you get 7/12 (decimal 0.583333). For 2/5 × 3/8, pick × and the result is 3/20 (decimal 0.15) — automatically reduced. For 3/4 ÷ 1/2, pick ÷ and you get 3/2 (decimal 1.5). Each fraction has its own numerator and denominator field; there is no free-text 'mixed number' parser, so a value like '1 1/2' has to be converted to its improper form (3/2) before entering it.
Two notes. Results are automatically reduced to lowest terms by dividing through by the greatest common divisor (6/40 reduces to 3/20). Negative numerators or denominators work; the sign is normalized into the numerator. Division by zero is reported as an error rather than producing a result. The math uses standard JavaScript numbers, so the calculator stays exact within ~15 significant digits — fine for any everyday fraction; for fractions with hundreds-of-digits numerators and denominators (very rare), floating-point limits start to matter.
Computation runs in your browser; nothing is uploaded.