Excavation Calculator
Calculate excavation volume and truck loads. Enter values for instant results with step-by-step formulas.
Formula
Volume = Length × Width × Depth
Calculate bank (in-place) volume, then apply bulking factor for loose volume to determine truck loads needed.
Worked Examples
Example 1: Foundation Excavation
Problem:Dig foundation pit 30×20×4 ft. Calculate removal volume.
Solution:Bank volume:\n30 × 20 × 4 = 2,400 cu ft\n2,400 ÷ 27 = 88.9 cubic yards\n\nLoose volume (25% bulking):\n88.9 × 1.25 = 111 loose yards\n\nTruck loads (10-yard trucks):\n111 ÷ 10 = 11.1\nNeed 12 truckloads
Result:89 bank yards = 111 loose yards (12 trucks)
Example 2: Trench Excavation
Problem:Utility trench 100 ft long, 2 ft wide, 3 ft deep.
Solution:Bank volume:\n100 × 2 × 3 = 600 cu ft\n600 ÷ 27 = 22.2 cubic yards\n\nLoose (30% bulking for clay):\n22.2 × 1.30 = 28.9 loose yards\n\nTrucks: 28.9 ÷ 10 = 3 loads
Result:22 bank yards = 29 loose (3 trucks)
Example 3: Pool Excavation
Problem:Pool 15×30 ft, varying depth 4-8 ft (average 6 ft).
Solution:Using average depth:\n15 × 30 × 6 = 2,700 cu ft\n2,700 ÷ 27 = 100 cubic yards\n\nLoose (25% bulking):\n100 × 1.25 = 125 yards\n\nTrucks: 13 loads
Result:100 bank yards = 125 loose (13 trucks)
Frequently Asked Questions
How do I calculate sloped excavation?
For safety, excavations need sloped sides. Slope ratios like 1:1 or 1.5:1 (horizontal:vertical). This expands top dimensions. Calculate using average width: (top width + bottom width) / 2, or use trapezoidal formulas. Slope requirements depend on soil type and depth.
Do I need permits for excavation?
Permits often required for: excavation over 4-5 feet deep, near property lines, in flood zones, or disturbing more than 1 acre. Call 811 (USA) for utility location before any digging. Violations can cause utility strikes, fines, or project shutdown.
What does excavation cost?
Excavation: $50-200 per cubic yard depending on soil, access, disposal. Machine rental: $200-1,000/day based on size. Operator: $50-100/hr if not included. Disposal: $30-100/yard at landfill. Total project varies widely - get multiple quotes for significant work.