Inputs

Job assumptions

Trench Length (ft)

Measure the planned centerline length; split the estimate into sections when depth, width, access, or conditions change.

Production (ft/hr)

Use completed-job feet per hour for similar depth, width, soil, utilities, access, and equipment.

Depth / Soil Factor

Use 1.0 for the documented baseline, then raise the factor only for deeper cuts, rock, wet soil, hand digging, shoring constraints, or restricted access.

Mobilization ($)

Enter the customer-facing equipment move and setup charge for this job; keep it separate from productive trenching time.

Backfill / Spoils Cost ($)

Add total cost for imported fill, bedding, compaction, spoils handling, export, and disposal.

Operating cost

Loaded Hourly Cost ($/hr)

Combine trencher or excavator ownership, operator, fuel, wear, maintenance, and overhead per working hour.

Profit & protection

Target Profit Margin (%)

Margin is profit divided by the final selling price, not a markup on cost.

Use the result as a cost checkpoint

Use this calculator for drainage, conduit, irrigation, water, electrical, and footing trenches where length, depth, soil, and backfill determine time.

This tool is best for quoting utility, drainage, footing, irrigation, and electrical trenches. Use the result to decide what a trench should cost after production speed, depth, soil difficulty, backfill, mobilization, and margin. Review utility conflicts, slow hand-digging, rocky soil, wet trench conditions, shoring concerns, and backfill expectations before relying on the result.

Worked example

A 220 ft trench at 55 ft/hour with a 1.25 factor needs about 5 machine hours before setup and backfill.

Call utility locates and add time for hand digging, rock, wet ground, shoring concerns, and backfill requirements. If excavated material leaves the site in repeated dump-truck loads, use the cycle hauling calculator to support that cost instead of hiding it in the trench production factor.

Input and quote review

Confirm trench depth, width, and whether bedding material is required.
Decide whether spoils stay on site or leave the property.
Charge for backfill and cleanup if the customer expects a finished surface.
Never ignore utility locate and hand-dig requirements.

Keep the final scope, assumptions, exclusions, allowances, change triggers, and post-job results with the estimate so future defaults are supported by evidence.

Common questions

Is this the final customer price?

No. It is a planning checkpoint. Walk the site, confirm scope and access, verify current costs, and apply contract, permit, tax, utility, safety, and professional requirements.

Where are saved inputs stored?

Only an explicit Save stores inputs in this browser's localStorage. Share places inputs in the URL hash. The calculator does not send them to Equipment Rate Calc.

Should I copy a competitor's rate?

Use market prices as a reasonableness check after calculating your own cost, scope, utilization, risk, and margin.

Support the linear production assumption

Use the production and unit-cost calculator when you can document capacity and full-cycle time; bring its bid-units-per-hour result back here only when the units and trench conditions match.

Important disclaimerPlanning estimate only. Verify current costs, measurements, production, scope, access, customer requirements, contracts, permits, insurance, taxes, and local rules before quoting or committing money. This tool does not determine utility clearance, shoring, slope, ground stability, legal payload, securement, machine capacity, licensing, traffic control, environmental compliance, or safe operating procedure. Follow applicable law, plans, manufacturer instructions, and qualified safety guidance.

Trenching Cost Calculator