Free construction calculator · Metric and imperial
Excavation Volume Calculator
Calculate pit or trench excavation volume with optional side slopes, bulking factor, and multiple identical sections.
Inputs
Enter measured dimensions
Formula and assumptions
Vertical-sided volume = length × width × depth; sloped pit volume uses the average end area of top and bottom dimensions
Use measured dimensions from the latest approved information. Check deductions, laps, allowances, material modules, supplier constraints, and rounding rules before ordering or certifying quantities.
The result is an estimate for planning and checking. It does not replace a coordinated quantity takeoff, temporary-works design, structural design, geotechnical assessment, or project-specific engineering review.
Questions
What is a bulking factor?
Excavated soil usually occupies more volume after it is disturbed. A bulking factor estimates the loose volume for haulage or temporary stockpiles.
Can this calculator determine a safe excavation slope?
No. Safe slopes and support systems depend on ground conditions, depth, water, adjacent loads, and local requirements. Use an approved excavation design.