Ratio Calculator
Use this free online Ratio Calculator to simplify ratios and solve proportions. It works instantly in your browser, and your data never leaves your device.
About the Ratio Calculator
Simplify ratios like 12:18 to 2:3 and solve A:B = C:D for the missing value.
How to use the Ratio Calculator
- Enter your values in the fields above.
- The Ratio Calculator updates the result instantly as you type.
- Copy the result or change any value to compare scenarios.
Features
- Free with no signup and no daily limits
- Private: runs entirely in your browser
- Works on mobile, tablet and desktop
- Instant results with no button to press
- Clean, fast interface with no popups
Frequently asked questions
Is the Ratio Calculator free to use?
Yes. The Ratio Calculator is completely free with no signup, no limits on normal use and no watermark.
How accurate is this calculator?
Calculations use standard formulas with full floating point precision. Results are rounded only for display. For financial or medical decisions, confirm with a professional.