Fraction Calculator
Enter a whole number (5), a fraction (3/4), a mixed number (1 1/2) or a decimal (0.5) on each side.
5/6
= 0.833333
About Fraction Calculator
Add, subtract, multiply, or divide two fractions and get the answer already simplified, alongside its decimal value.
Fraction arithmetic follows different rules depending on the operation — a common denominator for adding and subtracting, straight across for multiplying, flip-and-multiply for dividing — which is exactly the kind of thing that's easy to mix up doing by hand. This applies the right rule for whichever operation you pick and simplifies the result automatically.
Both sides accept a whole number (5) or a simple fraction (3/4) — an improper fraction like 7/2 works too, and there's no separate mixed-number format to learn, since any mixed number can be written as an improper fraction.
The result is always shown fully reduced to lowest terms, plus its decimal equivalent, so you get both the exact fraction and a quick sanity-check number at the same time.
A worked example
3/4 + 5/6: the common denominator is 12, so this is 9/12 + 10/12 = 19/12, shown as the improper fraction 19/12 with a decimal of about 1.583. Multiplying 2/3 by 9/10 gives 18/30, reduced to 3/5. Dividing 2/3 by 4/9 turns into 2/3 × 9/4 = 18/12, which simplifies to 3/2.
Every result comes back already in lowest terms, so you can check your own working against it, including whether a long calculation simplified fully.
What you can type
Each side accepts a whole number such as 5, a fraction such as 3/4, an improper fraction such as 7/2 or a mixed number such as 1 1/2 or -2 3/4. A zero denominator is rejected. Results that are improper are also shown as a mixed number, so 7/4 appears as 1 3/4 alongside the fraction and the decimal.
Checking homework without just copying
Work the problem first, then compare. If your answer differs, check the steps most often wrong: finding the common denominator when adding, remembering to flip the second fraction when dividing, and reducing at the end. The decimal under the answer is a quick sanity check, since 3/4 + 5/6 must be a little under 1.6. For division, dividing by a fraction less than 1 makes the answer larger, which catches the common slip of flipping the wrong one.
What you can use it for
- Add or subtract fractions for a homework problem.
- Check a recipe calculation that involves fractional measurements.
- Simplify a fraction that came out of a longer calculation.
- Convert a fraction result to its decimal equivalent.
- Divide a fraction by another fraction without doing the flip-and-multiply by hand.
How it works, step by step
- 1
Enter both fractions
A whole number or a fraction like 3/4 on each side.
- 2
Pick an operation
Add, subtract, multiply, or divide.
- 3
Read the result
Shown fully simplified, with its decimal value underneath.
Frequently asked questions
Can I enter a mixed number like 1 1/2?
Yes — type it as 1 1/2 or -2 3/4. Improper fractions such as 3/2 work too, and improper results are also shown as a mixed number.
Is the result always simplified?
Yes, always reduced to lowest terms — 2/4 comes back as 1/2, not left as-is.
What happens if I divide by a fraction that equals zero?
It's flagged as an error, the same way dividing by zero is undefined for ordinary numbers.
Is my calculation sent anywhere?
No. Everything is computed entirely in your browser.