Fraction Reducer Calculator to
Reduce Fractions to Simplest Form

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About the Calculator

This free online simplify fractions calculator will reduce fractions to simplest form in the blink of an eye, and even show its work.

Plus, in addition to simplifying fractions, the calculator will also convert a simplified improper fraction into a mixed number.

Also, be sure to check out my other online fraction calculators for adding and subtracting, multiplying, dividing, and comparing fractions.

Calculator Instructions

Enter the numerator (top) and the denominator (bottom) of the fraction you would like the calculator to attempt to reduce, and then click the "Reduce Fraction" button.

Mouse over the blue question marks for a further explanation of each entry field. More in-depth explanations can be found in the glossary of terms located beneath the Fraction Reducer Calculator.

What Does it Mean to "Reduce Fractions?"

One of the concepts that is central to working with fractions in math is that as long as you perform the same operation on both the numerator (top) and denominator (bottom), you won't change the underlying value of the fraction.

For example, if you begin the fraction 1/2, and multiply the top and bottom of the fraction by, say 5, you will not change the underlying value of the fraction no matter how many times you repeat the multiplication.

1 = 1 x 5 = 5 = 5 x 5 = 25 = 25 x 5 = 125
2 2 x 5 10 10 x 5 50 50 x 5 250

125 ÷ 250 = .50 = 1/2

Now, since 125/250 is the same as 1/2, 1/2 would be the simplified version of 125/250 (or 500/1000, 2500/5000, etc.). And since working with smaller numbers is easier that working with larger numbers, it always makes sense to reduce fractions to their simplest form before working with them.

How To Simply Fractions

The easiest way to simplify fractions is to use the fraction reducer calculator on this page. Otherwise, if you would like to simplify fractions manually, there are a couple of different ways:

The Trial and Error Method

To use the trial and error method of simplifying fractions you just start by attempting to divide the numerator and denominator by a small number that you believe to a common factor to both (usually 2) and then continue to work your way up. After each successful reduction, you then need to repeat the process until the numerator and denominator have no other factors in common.

8 = 8 ÷ 2 = 4 = 4 ÷ 2 = 2
12 12 ÷ 2 6 6 ÷ 2 3

The Greatest Common Factor Method

To use the greatest common factor method of simplifying fractions you first need to find the greatest common factor of the numerator and denominator. Next you simply divide the numerator and denominator by their greatest common factor.

Using the fraction 8/12 from above, we find that the greatest common factor of the numerator and denominator is 4.

8 = 8 ÷ 4 = 2
12 12 ÷ 4 3

Regardless of which manual method you choose, using them to reduce fractions can be extremely tedious and time consuming. Therefore I would suggest you bookmark the fraction reducer calculator and use it any time you are working with fractions.

The Final Step: Converting Improper Fractions

An improper fraction is a fraction that has a numerator that is greater than its denominator. Typically, when you are asked to simplify fractions, and a simplified fraction turns out to be an improper fraction, you would need one final step before the simplification was considered complete. And that would be to convert the improper fraction to a mixed number (a b/c).

To convert an improper fraction to a mixed number (the fraction reducer calculator does for you), you first divide the numerator by the denominator. The number of full times the denominator goes into the numerator becomes the whole number, the remainder becomes the numerator, and the denominator remains unchanged.

Here is how you would convert the improper fraction 5/3 into a mixed number.

5 >>> 5 ÷ 3 = 1 with remainder of 2 >>> 1 2
3 3

With that, let's use the Fraction Reducer to reduce a fraction to simplest form and/or to convert an improper fraction into a mixed number.

Fraction Reducer Calculator Glossary of Terms

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Simplifying fractions: The process of finding common factors for the numerator and denominator of a fraction, and then restating the fraction as quotients of their common factors. The process is repeated until there are no more factors common to the numerator and denominator. At that point the fraction is said to be "in simplest form."

Improper fraction: A fraction is said to be improper when the numerator (top number) is greater than the denominator (bottom number).

Convert mixed number: Optional: If you need help converting a mixed number to a fraction, enter it on this line and the calculator will convert it for you.

Numerator: Enter the top number of the fraction to be reduced and/or simplified.

Denominator: Enter the bottom number of the fraction to be reduced and/or simplified.

Greatest common factor: This is the greatest common factor for the numerator and denominator you entered. If the result is one, it means that your entries do not have any factors in common other than one -- meaning no reduction or simplification is possible. But in either case, the fraction reducer calculator will still report its conclusions and show its work below this line. Plus, if the fraction is an improper fraction it will convert it into a mixed number.

Fraction in simplest form: This is the entered fraction reduced to its simplest form.

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