Ratio Calculator

Calculate and simplify ratios, or find missing values in proportions. Useful for math, finance, and recipe scaling.

Enter Ratio or Proportion

Calculation Type

First Number

Second Number

Calculation Result

Enter values to calculate or simplify a ratio

Embed This Tool on Your Website

Want to provide a free Ratio Calculator to your visitors? Copy and paste the HTML code below into your website or blog. It's 100% free!

<iframe src="https://nextools.org/widgets/math-tools/ratio-calculator.php" width="100%" height="450" style="border:none; border-radius:12px; box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);" title="Nextools Ratio Calculator"></iframe>

What is a Ratio Calculator?

A Ratio Calculator is a mathematical utility that helps you compare two or more quantities. Ratios are fundamental in showing the relationship between numbers, such as mixing paint, scaling recipes, or determining aspect ratios for digital screens.

Our tool performs two primary functions: Simplifying Ratios (reducing them to their smallest whole number form) and Solving Proportions (finding a missing value when two ratios are equal).

The Power of Proportions

Why our ratio tool is a favorite:

Scale with Confidence: Perfect for architects or hobbyists who need to convert real-world dimensions to model scales accurately.
Cooking Precision: Easily double or triple a recipe by maintaining the exact ratio of ingredients.
Instant Simplification: No need to calculate the Greatest Common Divisor (GCD) manually; our tool does it for you.

How to Use the Calculator

Select "Simplify Ratio" or "Find Missing Value".
For simplification, enter the two numbers you want to compare.
For proportions, enter the three known values and use a "?" for the unknown.
Click "Calculate" to get the result.
The simplified ratio or the solved value will appear in the result panel.

Ratio & Proportion FAQ

How do I simplify 10:20?

Enter 10 and 20. The tool finds the GCD (10) and divides both sides to give you the simplified ratio of 1:2.

What is a proportion?

A proportion is an equation stating that two ratios are equal (e.g., 1:2 = 2:4). Our tool helps you solve these equations when one part is missing.

Can I use decimals in ratios?

Yes! Our calculator supports decimal inputs, which is particularly useful for precise scientific or financial calculations.

What is an aspect ratio?

An aspect ratio describes the proportional relationship between width and height (e.g., 16:9 for widescreen TV). You can use our tool to find equivalent dimensions.