Free tools

Ratio Calculator

Simplify ratios, scale them up or down, and solve for a missing value in a proportion.

Simplify a ratio

Scale a ratio

Scale by

Solve for missing value

Fill in three values — leave one blank to solve for it.

: = :

Our free ratio calculator lets you simplify ratios to their lowest terms, scale a ratio up or down by any factor, and solve for a missing value in a proportion — all instantly in your browser.

How to simplify a ratio

To simplify a ratio A:B, divide both values by their greatest common divisor (GCD). For example, 16:12 simplifies to 4:3 because the GCD of 16 and 12 is 4.

How to scale a ratio

Multiply (or divide) both values by the same factor. For example, scaling 4:3 by 2 gives 8:6, which simplifies back to 4:3.

How to solve a proportion

In a proportion A:B = C:D, you can solve for any missing value using cross-multiplication. For example, if A=2, B=3, C=4, then D = (B × C) ÷ A = (3 × 4) ÷ 2 = 6.

Super tools

Welcome to Super Tools! We're here to provide you with a collection of easy-to-use tools and utilities to help make your day-to-day tasks a little bit easier.

About Super Tools

Whether you need to quickly count the number of characters in a block of text, convert measurements from pixels to inches, or generate a catchy business name, you'll find what you need right here.

Our goal is to create a one-stop-shop for all your basic productivity needs. We've carefully curated a set of practical, user-friendly tools that are accessible to everyone. No complicated setups or confusing interfaces - just simple solutions to common problems.

Feel free to explore our growing suite of free tools and let us know if there's anything else we can do to help streamline your workflow. We're always happy to hear your feedback and suggestions.

Is Super Tools free?

Our suite of productivity tools is 100% free for anyone to use. We believe everyone should have access to helpful utilities that can save time and make life easier. Whether you're a student, freelancer, small business owner, or just someone looking to simplify certain tasks, you can take advantage of our free character counters, unit converters, name generators, and more without paying a dime. Our commitment to providing valuable, cost-free resources is central to our mission. You'll never encounter paywalls, subscriptions, or hidden fees on our site - just high-quality tools that you can use at no charge. Explore our growing collection of free online utilities today and discover how they can streamline your workflows and boost your productivity.