Ratio calculator
Simplify ratios, find missing values (e.g. 2:3 = 10:?), or scale proportions.
Mode
A
B
C
D
Result
2 : 3 = 10 : 15
How to use
1. Choose simplify, find missing, or scale mode.
2. Enter ratio values.
3. Read the result proportion.
Example
Ratio calculator
Simplify ratios, find missing values (e.g. 2:3 = 10:?), or scale proportions.
When to use
• When you need a quick estimate without spreadsheets.
• When you want privacy — calculations stay on your device.
Limitations
• When you need certified engineering or legal calculations.
• When site-specific conditions require a professional survey.
About this calculator
Simplify ratios, find missing values (e.g. 2:3 = 10:?), or scale proportions.
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Is my data uploaded?
No. All math runs locally in your browser.
Is this tool free?
Yes. No account or subscription required.