Trench Excavation Calculator
Estimate neat and waste-adjusted trench excavation volume from length, width, and depth. Use it for utility trenches, footings, and cut checks before calling trucks.
Enter your values, then press Calculate.
How to calculate
Enter trench length, excavated width, and depth. Width is the trench cut, not the pipe OD. Depth is from existing grade to trench bottom. Add waste for sloughing and over-dig.
Formula
Volume (ft³) = length (ft) × width (ft) × depth (ft). Cubic yards = ft³ ÷ 27. Waste multiplies the neat volume for over-excavation and irregular trench walls.
Common use cases
- Utility and storm trench takeoffs
- Footing excavation
- Checking truck counts against a cut
- Comparing 18 in vs 24 in trench widths
Worked example
Example: 100 ft of 24 in wide trench 4 ft deep
1. Neat volume in cubic feet
100 ft × 2 ft × 4 ft = 800 ft³
2. Convert to cubic yards
800 ft³ ÷ 27 = 29.6296 yd³
3. Apply waste
29.6296 × (1 + 0%) = 29.6296 yd³
Related calculators
- Trench Spoils CalculatorConvert bank trench yards to loose spoils and truckloads using a swell factor.
- Bedding CalculatorEstimate pipe bedding cubic yards from length, width, and depth.
- Backfill CalculatorEstimate trench backfill cubic yards after subtracting pipe displacement.
- Pipe Slope CalculatorConvert elevation drop and run into percent grade, ratio, and inches per foot.
FAQ
Is trench width the pipe diameter?
No. Use the excavated width, which is usually the pipe OD plus bedding clearance and worker room, not the nominal pipe size.
Does this include spoils swell?
No. This is in-place bank yards. Use the trench spoils calculator for loose yards and truckloads.
Disclaimer
These calculators are estimating tools for planning and field checks. They are not a substitute for approved plans, specifications, licensed professional engineering, or governing standards. Confirm densities, waste factors, and yields with your supplier and project documents.