Every calculator FigureDesk has shipped so far, grouped by category.
Solve for voltage, current, resistance, or power from any two values.
Convert power to current for DC, single-phase, or three-phase AC.
Convert current to power for DC, single-phase, or three-phase AC.
Convert between apparent power (kVA) and real power (kW) using your equipment's actual power factor.
Size an inverter from your continuous load and largest single starting surge.
Estimate how long a battery will run a given load, from capacity, voltage, and depth of discharge.
Estimate the battery capacity needed to cover your daily energy use for a chosen number of autonomy days.
Estimate the solar array size and panel count needed to offset your daily energy use, from your own peak sun hours and system losses.