Electrical Wiring Calculator

Estimate the amount of electrical wiring needed for your construction project.

Set up the basic parameters for your electrical wiring estimation

Building Type

Commercial buildings typically require conduit and THHN wire

Wiring Method

Romex is common in residential, conduit in commercial or exposed areas

Average Distance from Electrical Panel (feet)

The average distance from your electrical panel to the rooms

Contingency Factor (%)15%

Extra wire to account for waste, errors, and changes (recommended: 15-20%)

Include service entrance wire

Common wire types and their typical applications

14/2 Romex

For lighting circuits (15A)

$0.42/ft

12/2 Romex

For outlet circuits (20A)

$0.58/ft

10/2 Romex

For heavy appliances (30A)

$0.95/ft

10/3 Romex

For 240V appliances (30A)

$1.25/ft

1/2" EMT Conduit

For commercial/exposed runs

$0.85/ft

THHN Wire

For running in conduit

$0.35/ft