How are fractions simplified?
The calculator divides the numerator and denominator by their greatest common divisor (GCD), giving the lowest-terms answer every time.
Math calculators
Fraction Calculator
Add, subtract, multiply, or divide fractions - simplified instantly.
Complete guide
How to use Fraction Calculator
Enter the numerator and denominator of each fraction, choose an operation (+, −, ×, ÷), and the calculator returns the answer as a simplified fraction, a mixed number, and a decimal.
It automatically finds a common denominator for addition and subtraction and reduces every result to lowest terms using the greatest common divisor.
Mixed numbers and decimals
Every result is shown three ways: as an improper fraction, as a mixed number (e.g. 1½), and as a decimal - so you can use whichever you need.
Negative fractions
Enter a negative numerator such as −3 and the sign is carried correctly through addition, subtraction, multiplication, and division.
Answers
Fraction Calculator FAQs
How do I add fractions?
Enter both fractions, select Add (+), and the tool finds a common denominator and simplifies the result automatically.
Can it handle negative fractions?
Yes. Enter a negative numerator (e.g. -3) and the sign is handled correctly through every operation.
What is a mixed number?
A mixed number combines a whole number and a proper fraction, e.g. 1½. The tool shows both the improper fraction and the mixed number.
Is the result always simplified?
Yes - numerator and denominator are divided by their GCD to give the lowest-terms fraction.
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Methodology and examples
Fraction Calculator - Add, Subtract, Multiply & Divide Fractions: formula, example, and use cases
Maintained by FormatNest. Verify assumptions and sources before using results.
Formula or method
Fraction Calculator - Add, Subtract, Multiply & Divide Fractions uses the values entered in its dedicated fields, validates the inputs, and applies the calculation described in the result panel.
Best use cases
Use Fraction Calculator - Add, Subtract, Multiply & Divide Fractions when you need a fast browser-based estimate, comparison, or planning result without creating an account.
Important: Check the assumptions and inputs before relying on this estimate for an important decision.
Editorial note: Review the input definitions, units and assumptions before relying on results. For corrections, contact FormatNest with your inputs and expected result.