Fraction Calculator
Add, subtract, multiply & divide fractions.
100% private — runs in your browser, nothing is uploaded.
Simplified fraction
5/6
Mixed number
5/6
Decimal
0.833333
Results are always fully simplified using the greatest common divisor. Calculated locally in your browser.
How to use the Fraction Calculator
- 1Enter the first fraction
Type its numerator (top) and denominator (bottom).
- 2Pick an operation
Choose add, subtract, multiply or divide.
- 3Enter the second fraction
Type the second numerator and denominator.
- 4Read the result
See the simplified fraction, the mixed number and the decimal at once.
Examples
| Input | Output |
|---|---|
1/2 + 1/3 | 5/6 (≈ 0.833333) |
3/4 × 2/5 | 3/10 (0.3) |
7/2 as mixed number | 3 1/2 |
Free online fraction calculator
This fraction calculator adds, subtracts, multiplies and divides any two fractions and always returns a fully simplified answer — as an improper fraction, a mixed number and a decimal, side by side. It handles negatives, improper fractions and whole-number results, and it updates live as you type.
Always simplified, never wrong denominators
The classic mistake with fractions is adding numerators and denominators straight across (1/2 + 1/3 is not 2/5). The calculator uses the correct common-denominator method, then reduces the answer with the greatest common divisor, so 4/8 becomes 1/2 and 15/6 becomes 2 1/2 automatically.
For homework, cooking and carpentry
Fractions show up everywhere — math homework, halving a recipe that calls for 3/4 cup, or adding 5/8″ and 3/16″ on a cut list. Because all three result formats are shown together, you can grab whichever one the situation needs. Related tools: the percentage calculator and the average calculator.
Frequently Asked Questions
How do you add fractions with different denominators?
Rewrite both over a common denominator, then add the numerators: a/b + c/d = (ad + cb)/bd. So 1/2 + 1/3 = (3 + 2)/6 = 5/6. This calculator does it and simplifies automatically.
How do you divide fractions?
Multiply by the reciprocal — flip the second fraction and multiply: (a/b) ÷ (c/d) = (a/b) × (d/c) = ad/bc. For example, 1/2 ÷ 1/4 = 1/2 × 4/1 = 2.
How does the calculator simplify fractions?
It divides the numerator and denominator by their greatest common divisor (GCD). For 4/8 the GCD is 4, so the simplified form is 1/2. Results are always fully reduced.
What is a mixed number?
A whole number plus a proper fraction, like 1 2/3 instead of 5/3. The calculator shows both the improper fraction and the mixed-number form when the result is greater than one.
Does it handle negative fractions?
Yes. Enter a negative numerator (or denominator) and the sign is handled correctly through every operation, always displayed on the numerator in the result.
Is my input private?
Yes — all the math runs locally in your browser. Nothing is uploaded or stored.