Physics

Calculate LED strip amps, total watts, supply size, and amps per equal power feed for a low-voltage LED strip.

Estimate LED strip length, rolls, leftover strip, watts, amps, power supply size, and feed sections for a room or straight run.

Estimate LED lumens, candela, lux, and beam spot width from mcd, lumens, or a lux meter reading.

Find an LED resistor or LED current from voltage, LED count, and resistor value, with wattage and tolerance range checks.

Size a constant-current LED driver or LED resistor using voltage, current, series rows, parallel rows, and power reserve.

Size an LED strip or pixel power supply by watts, amps, voltage, extra capacity, and optional wire voltage drop.

Find LED watts from lumens and efficiency, including per-fixture watts, range mode, yearly cost, and optional savings.

Estimate LED lumens, watts, or room light count using lumens per watt, bulb lumens, and a usable light factor.

Calculate motor horsepower from volts, amps, efficiency, power factor, and DC, single-phase AC, or three-phase AC supply.

Calculate single-phase AC power, current, voltage, or power factor, plus VA, kVA, reactive power, and phase angle.