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 grow light coverage, lights needed, average PPFD, DLI, dimmer percent, and LED watts from tent size and light PPF.

Estimate true wall watts for an indoor grow light from area, DLI goal, hours, efficiency, and electricity cost.

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.