All calculators

Solar and electrical calculators with the formula on every page.

Electrical and wiring

Voltage drop calculator: volts and percent drop by wire size, length and current.
Watts to amps calculator: DC, single-phase and three-phase.
Amps to watts calculator: real power from current and voltage.
kW to amps calculator: kilowatts to running current.
kVA to kW calculator: real and reactive power from kVA.

More calculators for solar sizing, cost and payback, batteries and system design are being added every week.