Proportion Calculator
Solve rule-of-three problems quickly.
- Free
- No signup
- Private: runs in your browser
- Works on mobile
Proportion Calculator tool
Loading the tool…
Example
With the default values shown in the tool, the results look like this:
- is to D =
- 48
How to use Proportion Calculator
- Enter your values in the fields above.
- The result updates instantly as you type or change an option.
- Copy the result or note it down. Nothing is saved on our servers.
Why use DocConvertPRO?
- Free to use with no signup or watermark.
- Everything runs in your browser. Your input is not uploaded.
- Works on phones, tablets and computers.
- Made for Indian users: rupees, lakh/crore formats and local use cases.
About this tool
If A:B = C:D then D = B × C ÷ A.
Frequently asked questions
Where is it used?
Recipes, maps, currency and speed problems.
Can A be zero?
No.
Is it the same as the unitary method?
Yes, it is the same idea.