Extreme close-up of a wire stripper pulling black insulation off a stranded copper conductor

Tools · Drawings E-501 to E-505

Commercial electrical calculators

Three-phase kVA and amps, service headroom, EV parkade capacity, generator sizing and LED retrofit payback. Each shows its formula and assumptions, and the arithmetic runs in your browser: nothing is sent anywhere.

E-501 Three-phase kVA & amps Convert between kW, kVA and amps at 120/208 V and 347/600 V, and pick the next standard transformer size.
E-502 Service capacity & headroom Compare a service’s capacity with its recorded peak demand and the loads you plan to add, in kVA and amps.
E-503 EV parkade capacity How many chargers spare capacity supports at full power, and how many share it under load management.
E-504 Generator sizing Add up the loads a generator must carry, allow for power factor and motor starting, and see the kVA to plan around.
E-505 LED retrofit payback Energy and demand saved when fixtures are replaced, and simple payback at the energy price and project cost you enter.