Ratio Calculator
Calculate equivalent ratios. Find missing values in proportion problems (A:B = C:D).
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How It Works
Ratio Calculator
Enter three values to find the fourth in the proportion A:B = C:D. Leave one field empty.
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Quick Examples
How It Works
In a proportion A:B = C:D, the product of means equals the product of extremes:
A × D = B × C
To find a missing value, rearrange the formula:
- A = (B × C) / D
- B = (A × D) / C
- C = (A × D) / B
- D = (B × C) / A
Equivalent ratios can be found by multiplying or dividing both terms by the same number.
All calculations happen locally in your browser.
How to Use
- Select or drag and drop your file(s) into the upload area
- Adjust settings if available (quality, dimensions, etc.)
- Click the process/convert button
- Download the result
Features
- Completely free - no registration required
- Processed locally in your browser - files never uploaded
- Works offline once loaded
- Supports multiple file formats
- Fast processing with no server delays
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Frequently Asked Questions
What format should ratios be in?
Enter as A:B or A/B format. The tool finds equivalent ratios.