Fraction Simplifier
Reduce any fraction to lowest terms and see it as a decimal and a mixed number, or convert a decimal like 0.75 back to a fraction — calculated 100% in your browser with no upload.
2/3
0.6666666667
2/3
🔒 Everything is calculated in your browser — nothing is uploaded.
What this fraction simplifier does
Enter a numerator and a denominator and the tool instantly reduces the fraction to its lowest terms by dividing both numbers by their greatest common divisor (GCD). At the same time it shows the exact decimal value and the equivalent mixed number, so you can read the same quantity three ways at once. For example, 8/12 reduces to 2/3, which equals about 0.6667, and an improper fraction like 7/3 becomes the mixed number 2 1/3. Switch to Decimal to fraction mode to go the other way — type 0.75 and get 3/4, or 0.125 and get 1/8.
How the math works
Simplifying keeps the fraction's value the same while using the smallest possible whole numbers. The sign always stays on the numerator and the denominator stays positive, so -8/12 and 8/-12 both display as -2/3. A denominator of zero has no defined value, so the tool asks you to enter a non-zero denominator instead of showing a result. Everything updates live as you type.
Frequently asked questions
How do you simplify a fraction like 8/12?
Find the greatest common divisor of 8 and 12, which is 4, then divide both by it to get 2/3. This tool does that automatically the moment you type the numbers.
How do I convert a decimal to a fraction?
Switch to "Decimal to fraction" mode and type the value — 0.75 becomes 3/4, 0.125 becomes 1/8, and 1.5 becomes 3/2. It converts terminating decimals exactly by reading the digits you typed (so 0.333 gives its literal value 333/1000, not 1/3).
What is a mixed number and when do I get one?
A mixed number combines a whole number with a proper fraction, such as 2 1/3. You get one whenever the numerator is larger than the denominator, for example 7/3 becomes 2 1/3.
Is anything I type uploaded to a server?
No. All calculations run entirely in your browser using JavaScript. Nothing you enter is sent, stored, or uploaded anywhere.