4 calculators
Lighting
Lumens, lux, candela, LED wattage, and lighting layout calculators.
Calculators
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LED Equivalent Wattage Calculator
Use this LED equivalent wattage calculator to jump from common 25 W to 200 W incandescent shortcut tiers into LED, CFL, incandescent.
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LED Resistor Calculator
Calculate the resistor needed for one or more LEDs in series from supply voltage, LED forward voltage, and target current.
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Lighting Energy Cost Calculator
Estimate lighting energy use and operating cost from lamp wattage, fixture count, daily runtime, tariff, and billing horizon.
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Lighting Unit Converter
Convert lumens, lux, foot-candles, candela, and watts with the required lighting context: area, distance, beam angle, and luminous efficacy.
Related categories
Basic Circuits
Ohm's law, voltage divider, series and parallel resistance calculators.
Power & Energy
Watts, kilowatts, kWh, energy cost, amps-to-kW, and power conversion calculators.
Wiring
Wire gauge (AWG), ampacity, voltage drop, and conduit fill calculators.
Electrical Converters
Electrical unit converters for charge, potential, resistance, capacitance, and more.