Electrical Calculators
NEC-based tools for wire sizing, voltage drop and ampacity. Fast, accurate results for residential and commercial electrical work.
Wire Gauge & Ampacity
Look up NEC wire gauge ampacity for copper and aluminum conductors and find the right AWG for your circuit.
Voltage Drop Calculator
Calculate voltage drop and percentage for any wire run. NEC recommends keeping drop under 3% for branch circuits.
Our electrical calculators are built on NEC 310.15 ampacity tables and standard voltage-drop formulas used by licensed electricians every day. Whether you are sizing a new circuit, checking an existing run or preparing a load calculation, these tools give you a verified starting point. Always confirm results with the current NEC edition and your local AHJ requirements.