// FREE CALCULATORS
Duct Bank Sizing Calculator
Calculate overall duct bank envelope dimensions, concrete encasement volume, and a minimum burial depth reference from conduit layout, for underground duct bank design and quantity takeoff.
// INPUTS
// Results update automatically as you type
// CONDUIT LAYOUT
inches (NEC): 2" trade size PVC or RMC ≈ 2.375" (EMT is about 2.197")
inches (NEC): 3" typical minimum
// ENVELOPE & BURIAL
inches (NEC): 3" typical minimum
Number of Conduits
-
Conduit Group Width
-in
Conduit Group Height
-in
Overall Envelope (W × H)
-
Concrete Volume
-ft³ per linear ft
Minimum Burial Depth (reference)
-in
Disclaimer: Burial depth shown is a general reference only. NEC Table 300.5 (1,000 V and below) and Table 300.50 (above 1,000 V) set minimum cover that varies with wiring method, voltage, circuit type and location (under buildings, driveways, roadways) in more detail than this tool models, and cover is measured from the top of the conduit or concrete to finished grade. IEC 60364-5-52 does not give one universal depth, so national rules and utility practice govern; frost depth and traffic loading may also control. Always verify the exact minimum for your circuit and location before finalizing trench depth. Found an error or an outdated reference? Let us know at [email protected].
Please check inputs, all values must be positive.