Fraction calculator.
Use this free fraction calculator to get fast estimates, compare scenarios, and understand the numbers with clear step-by-step context.
Use the Fraction Calculator.
Results update automatically as you type. No account is required.
Enter your values
About the Fraction Calculator
A fraction calculator adds, subtracts, multiplies, or divides two fractions and reduces the answer to lowest terms. It also shows the decimal equivalent and the result as a mixed number.
How it works
Addition and subtraction use a common denominator (d₁ × d₂); multiplication multiplies across; division multiplies by the reciprocal. The result is then divided by the greatest common factor to simplify.
Reading the result
The headline is the simplified fraction, with the decimal value, the unsimplified form, and the mixed-number version shown alongside.
Note: Calculations run instantly in your browser and use exact mathematical formulas. For very large numbers, results are shown to standard floating-point precision.
FAQ
What does "lowest terms" mean?
A fraction where the numerator and denominator share no common factor other than 1 — like 1/2 rather than 2/4. The calculator reduces automatically.
How do you divide fractions?
Multiply the first fraction by the reciprocal (flipped version) of the second. The calculator handles this for you.
What is a mixed number?
A whole number plus a proper fraction, like 1 1/2. Improper fractions (where the top exceeds the bottom) convert to mixed numbers.