Fraction Calculator – Ultimate Tool to Add Fractions

Add, subtract, multiply, or divide two fractions by entering them below. Use a space to separate whole numbers from the fraction.

Result as a Fraction:

23+34=1512

Result as a Decimal:

23+34=1.4166666666667

Steps to Solve

Find the least common denominator so that all of the denominators match
The least common denominator of 3 and 4 is 12
Find the multiple for each fraction that can be multiplied by the denominator to get the least common denominator
Find the multiple by dividing the least common denominator by each fraction's denominator
Fraction 1 Multiple: 12 ÷ 3 = 4
Fraction 2 Multiple: 12 ÷ 4 = 3
Multiply each fraction's numerator and denominator by the multiple
2 × 43 × 4+3 × 34 × 3=812+912
Now that the denominators match, add the numerators
8 + 912=1712
Reduce the fraction by finding the greatest common factor. The greatest common factor of 17 and 12 is 1
Divide the numerator and denominator by the greatest common factor (1)
17 ÷ 112 ÷ 1=1712
Convert to a mixed fraction by finding the whole number and remainder
17÷12=1R5
1712=1512
Find the decimal by dividing the numerator by the denominator
1712=17÷12=1.4166666666667
Find the decimal by dividing the numerator by the denominator
1712=17÷12=1.4166666666667


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How to Calculate Fractions

The calculator above makes it easy to add, subtract, multiply, or divide fractions and even shows all of the work.

But how do you calculate fractions without a calculator? See the guides below to learn how to add and subtract, multiply, or divide them.

How to Add & Subtract Fractions

Adding and subtracting fractions is a little different from adding regular whole numbers. There are three easy steps to add or subtract fractions.

Follow along to see an example showing how to add 13 and 14.

one pie graph with three total slices and one slice highlighted and a second pie graph with four total slices and one slice highlighted

Step One: Convert to Fractions with a Common Denominator

step 1 to add a fraction is to make the denominators match

When adding or subtracting fractions, the first step is to convert them to equivalent fractions with the same denominator.

To do this, start by finding the lowest common denominator for the denominators of both fractions. The lowest common denominator is the smallest number that both denominators can be divided into evenly.

Next, find the multiple for each denominator that, when be multiplied, equals the common denominator. Find the multiple by dividing the common denominator by each denominator.

Then, multiply both the numerator and denominator by the multiple to find the equivalent fractions with matching denominators.

For example, let’s convert the fractions 13 and 14 to fractions with the same denominator.


Find the least common denominator. The least common denominator of 3 and 4 is 12.


Find the multiple for 13
multiple = lcd ÷ denominator
multiple = 12 ÷ 3 = 4

Find the equivalent fraction of 13 using the multiple 4
13 = (1 × 4)(3 × 4)
13 = 412


Find the multiple for 14
multiple = lcd ÷ denominator
multiple = 12 ÷ 4 = 3

Find the equivalent fraction of 14using the multiple 3
14 = (1 × 3)(4 × 3)
14 = 312


Thus, the equivalent fractions of 13 and 14 are 412 and 312

one pie graph with twelve total slices and four slices highlighted and a second pie graph with twelve total slices and three slices highlighted

Step Two: Add or Subtract the Numerators

step 2 to add fractions is to add the numerators

Once the denominators are all the same, adding and subtracting fractions is as simple as adding or subtracting the numerators.

To add the fractions, add the numerators together and put them over the common denominator.

To subtract, find the difference between the numerators and put the difference over the common denominator.

For example, let’s continue the previous example and add 412 & 312.

412 + 312 = (4 + 3)12
412 + 312 = 712

After both fraction denominators are the same, add numerators together to solve

Step Three: Simplify the Fraction

step 3 to add fractions is to reduce and simplify

The final step to adding or subtracting fractions is to simplify the result fraction. Start by finding the greatest common factor of both the numerator and the denominator. Learn more about finding the greatest common factor for more details.

Then, divide both the numerator and denominator by the greatest common factor to reduce. Or, just use our fraction simplifier to simplify and see all the work needed to do so.

Illustration showing how to add two fractions in three easy steps

How to Multiply Fractions

Multiplying two fractions is quite a bit simpler than adding or subtracting by following two easy steps.

Step One: Multiply the Numerators and Denominators

step one to multiply a fraction is to multiply the numerators and the denominators

The first step is to multiply the numerators together and multiply the denominators together. The result might be an improper fraction, but we’ll reduce it in the next step.

For example, let’s multiply 23 × 34.

23 × 34 = (2 × 3)(3 × 4)
23 × 34 = 612

Step Two: Simplify the Fraction

Like adding and subtracting, the final step of multiplying fractions is to simplify. To simplify, find the numerator and denominator’s greatest common factor, then divide both of them by the common factor.

To simplify 612, find the greatest common factor.

The greatest common factor of 6 and 12 is 6.


Next, divide both the numerator and denominator by the greatest common factor.

612 = (6 ÷ 6)(12 ÷ 6)
612 = 12

Illustration showing the three steps to multiply two fractions

How to Divide Fractions

There are two steps to divide one fraction by another.

Step One: Multiply Each Numerator by the Opposite Denominator

To divide one fraction by another, start by multiplying the first numerator by the second denominator. Then multiply the second numerator by the first denominator.

For example, let’s divide 23 by 34.

23 ÷ 34= (2 × 4)(3 × 3)
23 ÷ 34= 89

Step Two: Simplify the Fraction

Just like when multiplying fractions, the final step of dividing them is to simplify the fraction. See the instructions to simplify a fraction above.

How to Calculate Mixed Fractions

Mixed fractions might seem intimidating, but the process of calculating them is nearly the same as a normal fraction with one extra step.

The first thing to do when calculating a mixed fraction is to remove the whole number and increase the numerator.

Start by multiplying the whole number by the denominator.

Then, add the result to the numerator in the remaining fraction.

Continue following the steps above to calculate fractions after moving the result to the numerator.

For example, let’s convert the mixed fraction 2 25 to a whole number.

Multiply the whole number by the denominator.

2 × 5 = 10

Add the result to the numerator.

10 + 2 = 12

Rewrite the fraction.

2 25 = 125

Illustration showing how to divide two fractions step-by-step

Check out our complete suite of fraction math tools.