Swell Factor Calculator
Converts between bank and loose volumes using material swell and bulking factors.
Enter Values
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Enter the in-situ (bank) density and the loose density.
- Press Calculate.
- Read the swell factor and swell percentage.
How it works
Swell factor = bank density ÷ loose density = loose volume ÷ bank volume. It tells you how much 1 BCM bulks up once dug.
Worked example
Bank 2.6, loose 1.8 t/m³. Swell factor 1.44 (44% swell).
Frequently asked questions
What's swell used for?
Converting in-situ (bank) volumes to loose (truck/stockpile) volumes for haulage and stockpile planning.
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Cite this tool
Zerdly. (2026). Swell Factor Calculator. Retrieved from https://www.zerdly.com/tools/swell-factor-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.