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Fraction Calculator - Online Add Subtract Multiply Divide

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Fraction Calculator

Add, subtract, multiply, and divide fractions online — with steps, mixed numbers, and simplified results.

+ /
Leave whole or numerator empty if zero.
Denominator required and > 0.
+ /
Leave whole or numerator empty if zero.
Denominator required and > 0.

Frequently Asked Questions

To add fractions, find the least common denominator (LCD), convert each fraction, add the numerators, and simplify. For mixed numbers, convert them to improper fractions first. Example: 1/2 + 1/3 = 3/6 + 2/6 = 5/6.

Subtract fractions by finding a common denominator, converting the fractions, subtracting the numerators, and simplifying. With mixed numbers, convert to improper fractions first. Example: 3/4 − 1/2 = 3/4 − 2/4 = 1/4.

Multiply fractions by multiplying the numerators together and the denominators together. Then simplify. Mixed numbers should be changed to improper fractions before multiplying. Example: 2/3 × 3/4 = 6/12 = 1/2.

Divide fractions by multiplying the first fraction by the reciprocal of the second. Convert mixed numbers to improper fractions first. Example: 2/5 ÷ 3/4 = 2/5 × 4/3 = 8/15.

A mixed number combines a whole number and a proper fraction (e.g., 1 3/4). It represents the sum of the whole part and the fractional part. This calculator converts mixed numbers to improper fractions for easy arithmetic.

Simplifying (or reducing) a fraction means dividing the numerator and denominator by their greatest common divisor (GCD). The result is an equivalent fraction in lowest terms, such as 4/8 becoming 1/2.

An improper fraction has a numerator larger than or equal to its denominator (e.g., 7/4). It represents a value greater than or equal to 1. This calculator automatically converts improper fractions to mixed numbers.

You can enter a whole number by filling in the "Whole" field and leaving the numerator empty (or 0) and the denominator as 1. For example, to input 5, set Whole = 5, Numerator = 0, Denominator = 1.
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