EngineerHub.orgHow to use this calculator
Choose the excavation type, enter bottom dimensions and depth, then add side slopes and a swell factor where applicable.
Inputs
Results
Background
Engineering basis, equations, assumptions, interpretation and practical limitations for this calculator.
Vertical boxes use length × width × depth. Trenches use the trapezoidal cross-section. Sloped pits use the truncated-pyramid formula.
This calculator does not determine a safe excavation slope, shoring system or access arrangement. Soil conditions, groundwater, nearby structures and local safety rules require competent assessment.
Frequently Asked Questions
Practical questions about assumptions, inputs, interpretation and limitations.
Excavated soil often occupies more volume after loosening because the original compact structure is disturbed and more void space develops. The swell factor converts in-situ volume to an estimated loose volume.
Do not select a side slope by guesswork for safety-critical excavation. Use geotechnical information, excavation depth, groundwater conditions and the applicable safety and design requirements.
Not always. Payload mass, legal road limits, material density, body geometry and safe fill level can reduce the usable volume below the nominal body capacity.
In-situ volume is the volume of material before excavation. Loose volume is the larger volume the same material may occupy after excavation and disturbance.
Only if those dimensions are reflected in the entered excavation geometry. Construction allowances, shoring clearances and overbreak should be added according to the actual excavation plan.