Estimate how much material to remove from a dig site, the swell factor for hauling, and the cost to excavate. Use the Fill Calculator if you are bringing material in rather than removing it.
How this calculator works
Volume is length × width × depth, with wastage and a compaction factor stacked on top.
cubic_feet = length × width × depth × (1 + wastage%) × (1 + compaction%)cubic_yards = cubic_feet ÷ 27
- Excavated material expands (“swell”) — typically +20–30% over in-place volume — so a positive compaction factor accounts for haul tonnage.
- Some authorities require a soil-management plan above a certain cubic-yard threshold; check before mobilizing.
Common questions
How much does excavated soil expand?
Most soils swell 20–30% when excavated — clay is on the higher end, sand on the lower. Use a positive compaction factor (e.g., +25%) so your haul tonnage matches the loose volume coming out of the hole.
Do I need a permit to excavate?
It depends on volume, location, and what you’re digging near. Most municipalities have soil-management or fill-control bylaws above a certain cubic-yard threshold. Always call locates before any dig.
Should I include over-dig in my volume?
Yes — set the wastage allowance (typically 5–10%) to cover the over-dig that always happens at the perimeter when an excavator scoops outside the design line.
About This Excavation Calculator
This excavation calculator is designed to turn measurements into practical planning numbers you can use immediately. After entering cut dimensions, trench or pit profiles, depth changes, swell assumptions, and optional hauling costs, the calculator processes those values into excavation volume forecasts, crew planning clarity, and stronger pre-bid scope alignment. The goal is to replace rough guesswork with a repeatable method that works for homeowner projects, contractor estimates, and field-level decision support. Instead of manually converting units and checking formulas in multiple places, you can complete the process in one workflow.
In day-to-day use, this excavation calculator works best when measurements are taken carefully and entered in one unit system from start to finish. That makes results easier to compare and easier to share with suppliers or team members. It is especially useful for foundation digs, utility trenches, site cut-and-fill planning, and retaining wall prep where quick quantity checks can prevent under-ordering, over-ordering, and schedule changes. Using consistent inputs each time also helps standardize estimating habits across repeat jobs.
The most reliable outcomes come from combining calculator output with practical project checks. For this excavation calculator, that means factoring swell and haul strategy so disposal and trucking assumptions are realistic. Treat the result as a planning baseline, then adjust for site conditions, product availability, and project standards before final purchase or scheduling commitments. This approach gives you a safer buffer against costly surprises and keeps conversations with clients, vendors, and crews focused on clear numbers.
Use this excavation calculator as an early planning assistant, not a replacement for final site validation. It helps you test scenarios quickly, compare alternatives, and move from idea to workable estimate with fewer delays. When paired with accurate measurement habits and a final field review, the calculator can improve confidence at every stage: draft budgeting, quote preparation, procurement planning, and pre-install coordination. Revisit it whenever dimensions, material assumptions, or scope details change.