ToolSink

Fraction Calculator

Add, subtract, multiply or divide two fractions. Automatic simplification with decimal and mixed-number outputs.

=
5
6
Decimal
0.833333

What is the Fraction Calculator?

The Fraction Calculator adds, subtracts, multiplies and divides two fractions and returns the simplified result along with a decimal equivalent and a mixed-number version when it makes sense. Type the numerators and denominators, pick an operator and read the answer instantly.

Fractions come up in cooking, carpentry, tailoring, exam prep and technical drawings. Working them by hand means remembering LCMs and cross-multiplication. This calculator handles the arithmetic and simplification for you, and shows every equivalent form of the answer.

Everything runs in your browser — no numbers are sent anywhere, which makes the tool safe for kids using shared devices.

How to use the Fraction Calculator

  1. 1Enter the first fraction — numerator on top, denominator on the bottom.
  2. 2Pick an operator from the dropdown: +, −, × or ÷.
  3. 3Enter the second fraction.
  4. 4Read the simplified result to the right of the equals sign.
  5. 5Scroll down to see the decimal value and mixed-number form if applicable.

Key features

  • All four basic operations
  • Automatic simplification via GCD
  • Decimal and mixed-number equivalents
  • Handles negative fractions and zero numerators
  • Warns clearly when the denominator is zero
  • Runs offline

Examples

Addition

Input
1/2 + 1/3
Output
5/6 (≈ 0.833)

Multiplication

Input
2/5 × 3/4
Output
6/20 → simplified 3/10

Division

Input
7/8 ÷ 2/3
Output
21/16 → mixed 1 5/16

Why use this tool

  • No manual LCM or GCD needed
  • Multiple equivalent forms shown at once
  • Great teaching aid for maths students
  • Handles improper fractions correctly
  • Free forever

Common use cases

  • Cooking-recipe rescaling
  • Carpentry and tailoring measurements
  • Maths homework
  • Music theory (note-length arithmetic)
  • Comparing gear ratios
  • Financial ratios in probability problems

Frequently asked questions

What happens if I enter 0 as denominator?

The tool marks the result as "—" because dividing by zero is undefined.

Are results always simplified?

Yes — every answer is reduced to its lowest terms using the greatest common divisor.

Can I enter negative fractions?

Yes. Put the minus sign in either the numerator or the denominator.

Does it handle mixed numbers as input?

Not directly. Convert 1 1/2 into 3/2 first, then enter that improper fraction.

Is my data uploaded?

No — the calculator runs entirely in your browser.