Physics

Find volts from watts using current or resistance, with DC, single-phase AC, three-phase AC, power factor, and unit options.

Convert volts and amps to watts for DC, single-phase AC, or three-phase AC, with power factor and VA shown.

Calculate amps from watts and voltage for DC, single-phase AC, and three-phase AC loads, with power factor for AC.

Convert amps and volts to watts for DC, single-phase AC, or three-phase AC, with power factor and VA shown for AC.

Estimate a grow light beam footprint, corner coverage, ideal average PPFD, and optional DLI for your plant canopy.

Estimate actual LED grow-light wattage from canopy size, target PPFD, fixture efficacy, and daily lighting hours.

Estimate recessed light count, centered rows and columns, center spacing, and wall offsets for a rectangular room.

Estimate LED strip feed-wire voltage drop, percent loss, max one-way wire length, and a wire size that meets your limit.

Size an LED strip power supply and optionally check lead-wire voltage drop using strip length, watts, voltage, wire length, and AWG.

Find the LED resistor value, standard rounded resistor, actual current, and resistor heat for one DC LED string.