Electrical & energy calculators
Wire size, voltage drop, conduit fill, Ohm's law, BTU sizing and electricity cost, with the NEC tables cited.
- Voltage Drop CalculatorVolts lost on a run, and the wire that keeps it under 3%.
- Conduit Fill CalculatorHow many THHN wires fit in EMT, PVC or rigid conduit.
- Ohm's Law CalculatorAny two of V, I, R, P gives the other two.
- BTU CalculatorAC size from ENERGY STAR's chart, or a room's heat loss.
- Wire Size CalculatorAWG from amps and distance, checked for ampacity and drop.
- Electricity Cost CalculatorkWh and dollars per day, month and year for any appliance.
More electrical & energy calculators are on the way. See every calculator.