Electrical & Energy Calculators
Electrical and energy calculators that show their assumptions, units and code tables. They are planning aids: they do not replace the electrical code that applies where you are, the equipment manufacturer's instructions, or a licensed electrician.
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Wire Size Calculator
Find the minimum copper or aluminum conductor for a load, checking both ampacity (NEC Table 310.16) and voltage drop over your run length.
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Amp Calculator
Convert watts, kilowatts, kVA or motor horsepower to amps — or amps back to watts — for DC, single-phase and three-phase circuits.
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Energy Cost Calculator
How much does it cost to run? Enter the wattage, how long it runs and your rate per kWh to get the cost per hour, month and year.