Electrical Calculators
Select a tool below.
Free
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Residential Load Calc
NEC 220 Standard Method for Single Family Dwellings.
Free
📉
Voltage Drop
Calculate drop for any wire size (18 AWG - 2000 kcmil).
Free
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Conduit Fill
Calculate raceway fill for EMT, PVC, and Rigid conduits (NEC Ch.9).
Free
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Box Fill
Calculate box volume requirements (NEC 314.16).
🔒 PRO
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Load Calc: Optional Method
NEC 220.82 Calculation for existing dwelling upgrades.
🔒 PRO
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Commercial Load Calc
Multi-family and commercial occupancies with complex demand factors.