TrenchCalc

TrenchCalc is the go-to app for civil crews and site engineers who need fast, accurate trench volume calculations and material estimates — including cement-stabilised sand fill — directly on site.

Built for reliability, TrenchCalc handles both simple and complex trench configurations with support for:

Circular and box culverts

Benched, battered, or vertical wall types

Layered fill zones (bedding, haunch, overlay, etc.)

Cement content by zone (% of soil mass)

Computing spoil heap geometry

Custom fill densities and compaction factors

Imperial and metric units (instant toggle)

No more spreadsheets. No more guesswork. Enter trench dimensions and instantly get:

Net fill volume (compacted and loose)

Cement volume and mass

Per-zone material breakdowns

Truckload estimates

Soil testing frequency by lift (NDM, PSD/PI)

Access ramp excavation volume

Construction planner timelines

Engineered for site usability:

Large tap targets and swipeable inputs

Custom numeric keypad with clamping and units

Diagram preview updates live as you edit

Safety breach detection for trench depth, toe clearance, slope, spoil offset, and more

Contextual help dialogs with visual guides

Export ready: Save full breakdowns and test schedules. Tap to view fill volume by zone (bedding, haunch, overlay) or total stabilised mix — all matched to your selected trench profile.

Weather-based cement warnings: Get live alerts for extreme heat, cold, or rain within the next 24 hours to avoid poor cement placement conditions. (Pro feature)

Quick Save / Load: Save your trench settings mid-project and come back later. Restore all dimensions, wall types, culvert layout, fill materials, and more with a single tap.

Code compliance built-in: TrenchCalc checks your setup against safety thresholds (e.g. max vertical wall depth, solo worker limits, step height rules) and flags any breaches, including when depth changes after acknowledgement.

Designed by engineers, for engineers. Whether you're prepping culvert backfill, calculating spoil clearances, or setting up testing regimens, TrenchCalc helps you stay fast, accurate, and compliant.

Perfect for:

Supervisors needing quick field estimates

Site engineers checking trench profiles

Contractors pricing cement-stabilised backfill

QA staff planning test frequencies

Anyone needing confident material orders

Start calculating with confidence. TrenchCalc puts precision and clarity in your pocket — no internet required.

Try it free. Upgrade to Pro for cement weather alerts, testing exports, and planner tools.