Ratio Calculator
Solve ratios and scale factors with step-by-step math.
100% In-Browser • Zero Uploads
No Login Required
Enter exactly 3 values to solve for the missing value (A : B = C : D).
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About Ratio Calculator
Find missing values in proportions and scale ratios. Helpful for maps, recipes, and model building.
100% Client-Side
Your files and data are processed locally in your browser memory. Never uploaded to remote servers.
Zero Login Required
Instant access with no account, no email sign-up, no passwords, and no subscription paywalls.
Instant Speed
Powered by modern WebAssembly and native web APIs for near-instant rendering and zero latency.
Privacy Guaranteed
Zero data retention, no user tracking cookies, and GDPR/HIPAA friendly. Your data remains strictly yours.
All Devices Ready
Fully responsive on desktop, tablet, and mobile devices without installing software or extensions.
How to Use
- Choose whether to simplify a ratio or solve a proportion.
- Enter your known numbers.
- Click Calculate to compute your Ratio Calculator results instantly.
- View the simplified ratio or missing value.