---
title: "Fraction Calculator"
description: "Add, subtract, multiply and divide fractions with the steps shown. Simplifies to lowest terms and converts to mixed numbers. no signup required, no upload required."
url: https://findutils.com/calculate/fraction-calculator/
category: calculate
---

# Fraction Calculator

Add, subtract, multiply and divide fractions with the steps shown. Simplifies to lowest terms and converts to mixed numbers. no signup required, no upload required.

**Use this tool:** [Fraction Calculator](https://findutils.com/calculate/fraction-calculator/)

## Programmatic access

- REST id `fraction-calculator`: POST https://api.findutils.com/api/tools/fraction-calculator/execute (reference: https://findutils.com/api/fraction-calculator/)
- MCP tool `fraction_calculator` on https://mcp.findutils.com (reference: https://findutils.com/mcp/fraction-calculator/)

## Why use this fraction calculator?

Fraction arithmetic goes wrong in two places: finding a common denominator, and reducing at the end. This tool does both with exact integer arithmetic, so one third plus one sixth is exactly one half rather than a decimal that is almost right. It shows each step, which is the part that helps when you are checking homework rather than just needing the answer.

## Frequently Asked Questions

### What input formats are accepted?

Whole numbers (3), simple fractions (3/4), mixed numbers with a space (2 1/2), negative values (-2 1/2), and decimals (0.75), which are converted to an exact fraction.

### Why is the answer exact rather than a rounded decimal?

Everything is computed with whole-number numerators and denominators and only converted to a decimal at the end for display. A floating-point calculator gives 0.49999999999999994 for one third plus one sixth; this gives 1/2.

### How does it simplify a fraction?

It divides the numerator and denominator by their greatest common divisor, found with the Euclidean algorithm, and moves any negative sign onto the numerator.

### How do I convert an improper fraction to a mixed number?

Enter it and leave the second value empty. The result shows both forms: 7/2 also appears as 3 1/2.

### Why can I not divide by zero?

Dividing by zero is undefined, so the tool reports it rather than returning infinity. A zero denominator in an input is rejected for the same reason.

### Do I need an account?

No. This tool requires no signup, no usage limits, and no watermarks.

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