# Ratio Calculator

> Simplify a ratio A : B by dividing both sides by their greatest common factor. Optional cross-multiplication check against a second ratio C : D.

**URL:** https://www.calculatoranswers.com/ratio-calculator
**Category:** Education

## Quick Answer

Simplify ratios to their lowest terms or solve for a missing value. Enter your ratio terms to reduce or equate them.

## Definition

A ratio calculator is an arithmetic utility designed to simplify, compare, and solve ratios. It simplifies a given ratio of two numbers (A : B) by dividing both terms by their greatest common divisor, reducing it to its simplest integer form. The calculator also compares two different ratios to check if they form an equivalent proportion, and solves for a missing value (X) using cross-multiplication. Chefs, designers, and students use this tool to scale recipes, adjust design dimensions, and solve math problems.

## How to Use

1. **Select calculator mode** — Choose between simplifying a single ratio or solving for a missing value in a proportion.
2. **Enter ratio terms** — Type the numbers representing your ratio in the input boxes.
3. **Read simplified ratio** — View the simplified ratio terms, the greatest common divisor used, and the equivalent decimal value.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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