Concrete Trench Calculator
This concrete trench calculator sizes trench-fill foundations and utility duct banks: length × width × depth, with the waste allowance trench work demands. For duct banks, subtract conduit displacement with the encasement calculator.
Come usare questa calcolatrice
- Inserisci le tue dimensioni — piedi per le lunghezze, pollici per lo spessore.
- Regola le opzioni — percentuale di sfrido, dimensione del sacco e il prezzo locale del calcestruzzo.
- Leggi i risultati — volume, sacchi, peso e costo si aggiornano in tempo reale mentre digiti.
La formula
Trench volume = Length × Width × Depth Esempio svolto: A 30 ft trench, 18 in wide × 18 in deep: 30 × 1.5 × 1.5 = 67.5 ft³ ÷ 27 = 2.5 yd³ — order 2.75+ yd³; trenches over-break.
Trench-fill foundations pour the excavation full of concrete instead of building up blockwork from a footing — fast, and common in the UK. The volume math is a long, deep rectangle.
A concrete duct bank calculator starts the same way — trench length × width × depth — then subtracts the conduits. For a bank with significant conduit volume (4+ ducts of 4 inch), use our encasement calculator to net out the pipe displacement.
Real trenches are never neat: sides slough, bottoms undulate, and widths grow beyond the bucket size. Use 10% waste minimum, and 15% in loose soils.
Domande frequenti
Domande comuni sulla concrete trench calculator.
How much concrete to fill a trench?
Length × width × depth in feet ÷ 27 for cubic yards. A 50 ft × 2 ft × 2 ft trench needs 200 ft³ ≈ 7.4 yd³ — always round up for over-break.
What is a duct bank?
A concrete-encased group of electrical conduits in a trench. Compute the trench volume here, then subtract conduit displacement (a 4 in conduit displaces 0.087 ft³ per foot).
How much extra should I order for trench work?
10% minimum, 15% in sandy or loose soils. Trench sides collapse and bottoms are uneven — trenches consistently take more than the tape measure says.
Is trench fill cheaper than footings plus blockwork?
It uses more concrete but far less labor and time. For narrow deep foundations it's often the economical choice.
Calcolatrici correlate
Altri strumenti della famiglia di calcolatrici per calcestruzzo.