Fraction Calculator
Add, subtract, multiply, or divide two fractions — or mixed numbers — and get the answer in lowest terms, as a mixed number, and as a decimal. Everything is calculated instantly in your browser with nothing uploaded.
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Enter two fractions to calculate.
How to work with fractions
A fraction is a numerator over a denominator — the top number is how many parts you have, the bottom is how many equal parts make a whole. This calculator handles the four operations and always simplifies the answer.
Adding and subtracting. Put both fractions over a common denominator, then add or subtract the numerators. For 1/2 + 1/3, the common denominator is 6, giving 3/6 + 2/6 = 5/6. The calculator finds the common denominator for you.
Multiplying. Multiply the numerators together and the denominators together, then reduce: 2/3 × 3/4 = 6/12 = 1/2.
Dividing. Flip the second fraction and multiply — dividing by a fraction is the same as multiplying by its reciprocal: 1/2 ÷ 1/4 = 1/2 × 4/1 = 2.
Mixed numbers. Fill in the whole-number box to enter values like 1 1/2. Each mixed number is converted to an improper fraction before the math, and the answer is offered back as a mixed number too.
Everything runs in your browser — the numbers you type are never uploaded.
Fraction calculator questions
How do you add fractions with different denominators? Rewrite both over a common denominator, add the numerators, then simplify. The calculator does this and reduces the answer automatically.
How do you multiply and divide fractions? Multiply straight across for multiplication; for division, flip the second fraction and multiply.
Can it handle mixed numbers? Yes — add a whole-number part and the calculator converts to an improper fraction, computes, and gives the answer as a fraction, mixed number, and decimal.
How do you simplify a fraction? Divide the numerator and denominator by their greatest common divisor. Results here are always shown in lowest terms.
What about dividing by zero? It is undefined, so the calculator shows a message instead of a number when the second fraction or any denominator is zero.
A handy companion to the percentage calculator and the number base converter.