Fraction Calculator
Add, subtract, multiply, divide, and reduce fractions in your browser with clear input and result checks.
How to calculate with fractions
Enter the numerator and denominator values in the fraction form, choose the operation, and calculate. The page checks the denominator before evaluating and displays the result as a decimal or simplified fraction depending on the current tool interface. Keep the original inputs visible so you can check signs and units.
Fraction formulas
For addition and subtraction, use a common denominator. For multiplication, multiply the numerators and denominators. For division, multiply by the reciprocal of the second fraction. Reduce the result by dividing the numerator and denominator by their greatest common factor.
Worked example
For 3/4 + 1/2, convert 1/2 to 2/4, then add the numerators: 3/4 + 2/4 = 5/4 = 1.25. A zero denominator is invalid and should be corrected before calculation.
Frequently asked questions
Frequently Asked Questions About Online Calculators
Can the fraction calculator reduce a result?
Yes. It applies the reduction rule when the result can be represented by a simpler numerator and denominator.
Can I enter a negative fraction?
Yes, when the sign is part of a valid numerator or expression. Check the sign before calculating.
Does it require an account?
No. The calculator runs in the browser without signup.