Free Fraction Calculator — Add, Subtract, Multiply & Divide Fractions

A fraction calculator performs addition, subtraction, multiplication, and division on fractions and mixed numbers, showing every step from finding the LCD to simplifying the final answer to lowest terms. Instead of wrestling with common denominators on paper, you enter two fractions, pick an operation, and get a fully worked solution in seconds.

Fractions show up everywhere — cooking recipes, construction measurements, financial splits, and math homework. This calculator handles the tedious parts automatically while showing you the work, so you can learn the process or simply verify your own calculations.

• Add and subtract fractions - Find the LCD, convert both fractions, combine numerators, and simplify in one step
• Multiply fractions - Multiply straight across (numerator × numerator, denominator × denominator) with automatic simplification
• Divide fractions - Flip the second fraction and multiply, with the reciprocal step shown clearly
• Auto-simplify results - Every answer is reduced to lowest terms using the GCD of numerator and denominator
• LCD calculation - See how the least common denominator is found and how each fraction is converted
• Decimal equivalent - Get the decimal form of your fraction result alongside the simplified fraction

• Finding common denominators - Addition and subtraction require matching denominators, which means finding the LCD and converting both fractions before you can combine them
• Forgetting to simplify - It's easy to stop at a correct but unsimplified answer like 6/8 instead of reducing to 3/4
• Division confusion - Dividing fractions requires flipping the second fraction (taking its reciprocal) before multiplying, a step that trips up many students
• Negative sign tracking - When one or both fractions are negative, keeping track of where the negative sign belongs through multiple steps often leads to errors

Enter two fractions using the numerator and denominator fields, then select your operation (add, subtract, multiply, or divide). For addition and subtraction, the calculator finds the least common denominator, converts both fractions, combines the numerators, and simplifies. For multiplication and division, it multiplies across (flipping the divisor for division) and simplifies.

Every step is displayed in order — LCD calculation, fraction conversion, the operation itself, GCD determination, and final simplification — so you can follow the logic from start to finish.

Example

To add 3/4 + 2/3, the calculator finds the LCD of 4 and 3, which is 12. It converts to 9/12 + 8/12, adds the numerators to get 17/12, checks for simplification (17 and 12 share no common factors), and returns 17/12 (or 1 5/12 as a mixed number). The decimal equivalent 1.4167 is also shown.

• Cooking adjustments - Scale a recipe calling for 3/4 cup by multiplying by 2/3 to get a smaller batch
• Construction math - Add lumber measurements like 5/8 inch + 3/16 inch for precise cuts
• Homework verification - Check your fraction arithmetic step by step before turning in assignments
• Financial calculations - Split costs into fractional shares among partners or roommates
• Test preparation - Practice fraction operations and learn the LCD method for upcoming exams

• All four operations - Add, subtract, multiply, and divide fractions in a single tool
• Step-by-step solutions - See every intermediate step from LCD to final simplification
• Always simplified - Results are automatically reduced to lowest terms so you never submit an unsimplified answer
• Handles negatives - Negative fractions are tracked correctly through every operation
• Free and instant - No sign-up, no software — just enter your fractions and get the answer

What operations are supported?

The calculator supports addition, subtraction, multiplication, and division of proper fractions, improper fractions, and whole numbers expressed as fractions. It covers every standard fraction operation you'd encounter in school or daily life.

Does it show the work?

Yes. Every calculation displays the full step-by-step process — finding the LCD, converting fractions, performing the operation, determining the GCD, and simplifying to lowest terms. This makes it a great learning tool as well as a quick-answer tool.

Can I enter negative fractions?

Absolutely. Enter a negative sign with either the numerator or the whole number portion. The calculator tracks negative signs through every step and places them correctly in the final answer.

What is an LCD and why does it matter?

The Least Common Denominator is the smallest number that both denominators divide into evenly. You need it for addition and subtraction because you can only combine fractions that share the same denominator. The calculator finds the LCD automatically.

Does it show decimal equivalents?

Yes. Alongside the simplified fraction result, the calculator displays the decimal equivalent so you can see both representations of the answer.

Is this calculator free?

Yes, the fraction calculator is completely free to use with no limits on the number of calculations you can perform.