Energy & Electrical
LED Wattage Calculator
Calculate total system wattage, lumen output, and efficacy for LED lighting projects. Add multiple circuit types to build a complete load summary.
Add Circuit / Fixture Type
Circuit Name
Watts per Fixture  12 W
Quantity  10
Lumens per Fixture  800 lm
Hours per Day  10 hrs
Project Circuits
Add circuits using the form on the left.
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W total
System wattage
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lm total
System lumens
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lm/W avg
System efficacy
0
kWh/day
Daily energy
Wattage Breakdown by Circuit
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.