Fraction Calculator

How It Works

1. Pick a mode. Choose Calculate, Mixed Numbers, Simplify, Decimal ↔ Fraction, or Big Numbers.
2. Enter fractions. Use whole (optional), numerator, and denominator fields — or type text like 2 1/3.
3. Select operation. Add, subtract, multiply, or divide; the tool finds LCD and simplifies automatically.
4. Review steps. The right panel shows the result, decimal equivalent, mixed form, and full work.
5. Switch modes anytime. Each tab is independent — results update live as you type.

All Fraction Tools in One Place

Whether you are checking homework, simplifying an answer, or converting a measurement, this free Fraction Calculator covers every common task with clear step-by-step work. It lives in our Math Calculators category alongside tools like the Percentage Calculator and Factor Calculator — all free on CalculatorAuxo with no account required.

Students often pair this page with our Simplify Calculator for reducing expressions, or the Average Calculator when working with grade lists. For written walkthroughs, see how to put a fraction in a calculator and how to convert fraction to decimal without a calculator on our blog.

Calculator Modes

Calculate — add, subtract, multiply, or divide two fractions. The tool finds the LCD, converts, computes, and simplifies automatically.
Mixed Numbers — enter a whole number plus a fraction (e.g. 2¾) for addition, subtraction, multiplication, or division.
Simplify — reduce any fraction to lowest terms using the greatest common divisor.
Decimal → Fraction — turn decimals like 1.375 into exact fractions such as 11/8.
Fraction → Decimal — divide numerator by denominator for a precise decimal result.
Big Numbers — arithmetic with very large integer numerators and denominators using precision math.

When to Use Each Mode

Use Calculate for standard two-fraction homework. Choose Mixed Numbers when problems include whole parts. Pick Simplify when you already have an answer and only need lowest terms. Switch to Decimal ↔ Fraction modes for recipes, science labs, or unit conversions. Use Big Numbers when normal calculators overflow on huge integers.

Quick Tips

Always enter denominators as non-zero integers. For right triangles after fraction work, try the Pythagorean Theorem Calculator. Browse the full Calculator Directory, visit the FAQ, or contact us if you spot an error.