Fraction Calculator – Add, Subtract, Multiply & Divide
Compute with fractions and mixed numbers, then simplify the answer.
- Free
- Instant result
- Private · on-device
- No sign-up
How to use: Enter two fractions (or mixed numbers), choose an operation, and get a simplified result plus a decimal.
How to use the Fraction Calculator
Enter two fractions as numerator and denominator pairs, then choose add, subtract, multiply, or divide. The calculator computes an exact fractional result, reduces it to lowest terms, and also shows a decimal approximation for quick checks.
Addition and subtraction use a common denominator. Multiplication multiplies numerators and denominators. Division multiplies by the reciprocal of the second fraction. Zero denominators are rejected, and improper fractions are allowed.
Use this for recipes, workshop measurements, or school homework when you need exact answers rather than rounded decimals. Cross-check with the percentage calculator when a problem asks for “what percent” of a quantity.
Keep signs consistent: negative numerators are supported for signed arithmetic. If you only have a mixed number such as 2½, convert it to an improper fraction (5/2) before entering.
Results are educational and exact for rational inputs. For very large integers, browser number limits can affect display; simplify inputs when possible.
Frequently asked questions
How do I add fractions?
Rewrite with a common denominator, add numerators, then simplify.
What is a mixed number?
A whole number plus a proper fraction, such as 2 1/3.
How do I simplify a fraction?
Divide top and bottom by their GCD.
Can I divide by a fraction?
Yes — multiply by its reciprocal (flip the second fraction).