Fraction Calculator
Add and simplify fractions.
Add and simplify fractions.
How to use Fraction Calculator
- Enter a numerator and denominator for each of the two fractions
- Pick add, subtract, multiply, or divide
- Read the reduced answer as an improper fraction, mixed number, and decimal
About Fraction Calculator
The fraction calculator adds, subtracts, multiplies, or divides two fractions and gives you the answer in every form you might need. Type a numerator and denominator for each fraction, choose an operation, and it works out the result instantly, then reduces it to lowest terms using the greatest common divisor. Every answer appears three ways at once — as an improper fraction, as a mixed number, and as a decimal — so you can copy whichever your homework, recipe, or measurement calls for.
Because it always simplifies, the tool doubles as a quick way to turn a decimal into a fraction: write the decimal over a power of ten (0.75 becomes 75/100), enter it, and read off the reduced fraction, 3/4. It handles negative numerators and denominators correctly, keeping the sign on the numerator and the denominator positive, and it catches a denominator of zero or division by a zero fraction, flagging them clearly instead of returning a broken result. Whether you call it fraction math or fraction maths, the mixed-number output means you never have to turn 7/4 into 1 3/4 by hand.
It is completely free, with no sign-up and no limits on how many calculations you run. Everything happens in your browser on your own device — nothing you type is uploaded, saved, or shared, so your numbers stay private.
Frequently asked questions
- Is the fraction calculator free to use?
- Yes, it is completely free with no sign-up, account, or limits. You can add, subtract, multiply, and divide as many fractions as you like at no cost.
- How do I add or subtract two fractions?
- Enter the numerator and denominator of the first fraction, pick add or subtract, then enter the second fraction and read the result. The calculator finds a common denominator for you and reduces the answer to lowest terms, so 1/2 + 1/3 comes back as 5/6 with no manual steps.
- Can it multiply and divide fractions too?
- Yes. Choose multiply or divide instead of add or subtract and it handles both. For division it multiplies by the reciprocal of the second fraction and then simplifies, and it blocks dividing by a fraction that equals zero.
- How do I convert a decimal to a fraction with this calculator?
- Write the decimal as a fraction over a power of ten, then let the tool simplify it. For 0.75, enter 75/100 and multiply it by 1/1 — the result reduces to 3/4. For 0.6, use 6/10 to get 3/5. Any terminating decimal converts this way.
- Can I use it as a mixed number calculator?
- Yes, in both directions. Every answer is shown as a mixed number as well as an improper fraction, so 7/4 also appears as 1 3/4. To enter a mixed number, first turn it into an improper fraction — 2 1/3 becomes 7/3 — then type 7 as the numerator and 3 as the denominator.
- How does it reduce a fraction to lowest terms?
- After computing the result, the tool finds the greatest common divisor (GCD) of the numerator and denominator and divides both by it, giving the fully simplified fraction. It also normalizes the sign so the denominator stays positive.
- What is the difference between the improper fraction and mixed number shown?
- An improper fraction like 7/4 keeps the value as a single fraction where the numerator can exceed the denominator. A mixed number like 1 3/4 splits it into a whole part plus a proper fraction. The tool shows both, plus a decimal.
- Does it also show the decimal value of the answer?
- Yes. Alongside the improper fraction and mixed number, each result is shown as a decimal, so 3/8 also appears as 0.375. That makes it easy to compare fractions or drop the value straight into a spreadsheet or a measurement.
- What happens if I enter a denominator of zero?
- A denominator of zero is mathematically undefined, so the tool displays a clear error message instead of a result. It also blocks dividing by a fraction that equals zero.
- Can it handle negative fractions?
- Yes. You can enter negative numerators or denominators, and the calculator handles the signs correctly, always presenting the reduced result with a positive denominator.
- Is my data uploaded anywhere?
- No. All calculations run entirely in your browser on your own device. Nothing you enter is sent to a server, saved, or shared, so your inputs stay private.