Fraction Calculator
Add, subtract, multiply, or divide two fractions without doing the messy work yourself. You can enter fractions like 3/4 or just decimals. Results are fully simplified and shown as a decimal too.
How to use
- Type each value as a fraction (3/4) or decimal (0.75) - either works.
- Pick whether you want to add, subtract, multiply, or divide them.
- Hit Calculate and you'll get the answer as a simplified fraction and as a decimal.
Related tools:
A fraction represents a part of a whole, written as a/b where a is the numerator and b is the denominator. Adding and subtracting fractions requires a common denominator, while multiplying fractions is straightforward (multiply numerators and denominators separately), and dividing fractions means multiplying by the reciprocal. Our calculator handles all four operations and automatically simplifies results using the Greatest Common Divisor (GCD).
Mixed numbers (like 2½) can also be entered directly. The calculator converts them to improper fractions internally, performs the operation, and converts the result back to a mixed number if appropriate. Results are shown both as simplified fractions and as decimals for easy interpretation.
Frequently Asked Questions
How do you add fractions with different denominators?
Find the Least Common Denominator (LCD) of both fractions. Convert each fraction to an equivalent fraction with the LCD, then add the numerators. For example, 1/3 + 1/4: LCD is 12, so 4/12 + 3/12 = 7/12.
How do you multiply fractions?
Multiply the numerators together and the denominators together, then simplify. For example, 2/3 × 3/4 = (2×3)/(3×4) = 6/12 = 1/2. You can also simplify diagonally before multiplying to keep numbers small.
How do you divide fractions?
Flip the second fraction (take its reciprocal) and multiply. For example, 2/3 ÷ 4/5 = 2/3 × 5/4 = 10/12 = 5/6. The common mnemonic is 'keep, change, flip': keep the first fraction, change division to multiplication, flip the second.
How do you simplify a fraction?
Divide both numerator and denominator by their Greatest Common Divisor (GCD). For example, 12/18: GCD of 12 and 18 is 6, so 12/18 = 2/3. A fraction is fully simplified when the GCD of numerator and denominator is 1.