Fraction Calculator & Simplifier

Fraction calculator to add, subtract, multiply, divide, simplify fractions, convert to mixed numbers, decimals and percent. Supports inputs like 3/4, 2 1/2, 0.75. Includes fraction rules and FAQ.

Full original guide (expanded)

Fractions

Fraction Calculator & Simplifier

Add, subtract, multiply, and divide fractions with simplified results.

Calculator

Results

Result (simplest fraction)

Mixed number

Decimal

Percent

Steps

What is a fraction?

A fraction represents a part of a whole and is written as \( \frac{a}{b} \), where \(a\) is the numerator and \(b\) is the denominator. In Italian, “fraction” in the mathematical sense is “frazione”.

In English, fraction can also mean “a very small part” (Italian: “una piccola parte”, “minima parte”). This page focuses on the mathematical tool.

Basic fraction operations

Add/Subtract: \( \frac{a}{b} \pm \frac{c}{d} = \frac{ad \pm bc}{bd} \)

Multiply: \( \frac{a}{b} \times \frac{c}{d} = \frac{ac}{bd} \)

Divide: \( \frac{a}{b} \div \frac{c}{d} = \frac{a}{b} \times \frac{d}{c} = \frac{ad}{bc} \)

How to simplify a fraction

  1. Find the greatest common divisor (GCD) of numerator and denominator.
  2. Divide both by the GCD.
  3. Ensure denominator is positive.

FAQ

Can it parse “2 1/2”?

Yes. It’s converted to \(\frac{5}{2}\) internally.

What about decimals?

Decimals are converted to fractions by counting decimal places. For example 0.125 → 125/1000 → 1/8.


Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\\]
','\
Formula (extracted text)
Add/Subtract: \( \frac{a}{b} \pm \frac{c}{d} = \frac{ad \pm bc}{bd} \) Multiply: \( \frac{a}{b} \times \frac{c}{d} = \frac{ac}{bd} \) Divide: \( \frac{a}{b} \div \frac{c}{d} = \frac{a}{b} \times \frac{d}{c} = \frac{ad}{bc} \)
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn
Formulas

(Formulas preserved from original page content, if present.)

Version 0.1.0-draft
Citations

Add authoritative sources relevant to this calculator (standards bodies, manuals, official docs).

Changelog
  • 0.1.0-draft — 2026-01-19: Initial draft (review required).