Math
Fraction Calculator
Work with fractions in the direction you need: operate on two fractions, simplify one fraction, compare two fractions, or turn a decimal into a clean fraction.
Try an example
Result
Result (simplified)
—
- Mixed number
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- Decimal
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- Percent
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Student quick launch
Grade planning, algebra checks, and formulas students reach for most.
Study path
Use this calculator with
Follow these when you want the formula behind the answer, a short lesson, or nearby tools in the same topic.
What this fraction calculator can solve
| Mode | Use it when | Output |
|---|---|---|
| Operate | You need to add, subtract, multiply, or divide fractions | Simplified answer, decimal, percent, mixed number, and steps |
| Simplify | You need a fraction in lowest terms | GCD, simplified form, mixed number, and decimal |
| Compare | You need to know which fraction is larger | Cross-products, comparison sign, and difference |
| Decimal to fraction | You have a decimal answer | Closest fraction within the denominator limit |
Adding and subtracting fractions
Use a common The bottom number of a fraction; it says how many equal parts make one whole., then combine the The top number of a fraction; it counts how many parts you have.. The calculator also shows the common denominator and simplifies the result.
Multiplying and dividing fractions
Multiplication goes straight across. Division means multiply by the The number you get by flipping a fraction; 3/4 becomes 4/3, and 5 becomes 1/5. of the second fraction.
Simplifying fractions
A fraction is simplified when the numerator and denominator have no common factor greater than 1. Divide both by the greatest common divisor.
Worked examples
1/2 + 1/3
Add with a common denominator
Result (simplified)
5/6
3/4 x 2/5
Multiply straight across
Result (simplified)
3/10
Simplify 42/56
Reduce to lowest terms
Result (simplified)
3/4
Compare 5/8 and 3/5
Use cross-products
Result (simplified)
1/40
0.375 as a fraction
Convert decimal to exact fraction
Result (simplified)
3/8
Frequently asked questions
Does this handle negative fractions?+
Yes. Enter the negative sign in the numerator. The calculator normalizes signs so the denominator stays positive.
What is a mixed number?+
A mixed number writes an improper fraction as a whole number plus a proper fraction. For example, 7/3 is 2 1/3.
How do I compare fractions?+
Cross-multiply. For a/b and c/d, compare a x d with c x b. The larger cross-product belongs to the larger fraction.
Why is my decimal-to-fraction result approximate?+
Some decimals repeat forever or need a large denominator. Increase the maximum denominator for a closer match.
About this calculator
- Written by
- mathcheck editorial team
- Last reviewed
- May 8, 2026
Method
- Uses the values entered by the user and stable formulas documented on the page.
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Last updated: May 8, 2026