Ratio Calculator
Work with ratios two ways. In simplify mode, enter a ratio like 40 to 16 and the calculator reduces it to its lowest whole-number terms using the greatest common divisor, so 40:16 becomes 5:2. In proportion mode, enter three parts of an equation A:B = C:D and leave one blank, and it solves for the missing value, which is exactly what you need for scaling recipes, mixing ratios, resizing images or reading maps. Keeping ratios in their simplest form makes them far easier to compare and reason about. Both modes handle decimals and update the moment you change an input. Everything is worked out locally in your browser, with no data leaving your device at any point.
How to use Ratio Calculator
- Enter the terms of your ratio.
- To solve a proportion, leave the unknown blank.
- Read the simplified ratio or the missing value.
Frequently asked questions
How does it simplify a ratio?
It divides both terms by their greatest common divisor to reduce the ratio to its lowest whole-number terms.
Can it solve a proportion?
Yes. Enter three of the four values in two equivalent ratios and it finds the missing value that keeps them proportional.
Does it handle ratios with more than two parts?
It focuses on two-term ratios and proportions, simplifying and cross-solving A to B against C to D.
What is Ratio Calculator?
Work with ratios two ways. In simplify mode, enter a ratio like 40 to 16 and the calculator reduces it to its lowest whole-number terms using the greatest common divisor, so 40:16 becomes 5:2.
Is Ratio Calculator free to use?
Yes. Ratio Calculator is completely free, with no sign-up and no usage limits.
Does Ratio Calculator work in a web browser?
Yes. Ratio Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Ratio Calculator?
Yes. Ratio Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
Badge
Link this tool from a README, doc or site. The badge links back to this page.
[](https://yourhack.ai/ratio-calculator)