Excavation Swell Calculator
Convert in-place excavation volume into an estimated loose volume using a swell percentage for the material after excavation.
How to use this calculator
- Enter in-place volume and a non-negative swell percentage.
- Confirm that all inputs use the stated units and the same population, period or scope.
- Change one assumption at a time when comparing scenarios.
Formula used by the excavation swell calculator
Loose volume = bank volume × (1 + swell%/100)
- Loose volume = bank volume × (1 + swell%/100)
- Swell varies by soil, rock, water content and handling; use site-specific data for procurement or haulage.
- Inputs are validated against required ranges and outputs are rounded for readability.
Worked examples
Worked example
12 m³ in place with 25% swell.
Loose volume estimate is 15 m³.
Loose volume estimate is 15 m³.
Understanding the result
Convert in-place excavation volume into an estimated loose volume using a swell percentage for the material after excavation.
Swell varies by soil, rock, water content and handling; use site-specific data for procurement or haulage.
Important notes
Swell varies by soil, rock, water content and handling; use site-specific data for procurement or haulage.
Use the result as a calculation aid for the inputs supplied; confirm critical specifications independently.
Frequently asked questions
Is swell the same as compaction?
No; swell is the volume increase when material is loosened. Compaction generally reduces placed volume.
Can I use a generic percentage for contracts?
Use the contract specification or geotechnical guidance where quantities affect cost or compliance.
How do I use this calculator?
Enter in-place volume and a non-negative swell percentage.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.