Power Supply Sizing Calculator

Size the right power supply for any LED lighting system. Enter your loads, output voltage, and installation environment — get a recommended PSU wattage with safety margin, thermal derating, redundancy options, and heat dissipation for enclosure sizing.

Power supply specification
Temperature at PSU location (cabinet / room)
Connected LED loads
Load description Qty W each

Please add at least one load.

Recommended PSU rating
0 W
0W
Connected load
0A
Output current
0W
Heat dissipated
0%
Load factor
Load as % of recommended PSU rating
0% 100%
PSU configuration options
Thermal derating – output capacity vs temperature
Ambient temperature Derate % Max output Your load fits?
Power supply selection tips
Total connected load
Required PSU rating
Output current
Heat dissipated
Temp derating applied
Redundancy
IP / enclosure rating
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The calculators and tools on LightingCalc.lighting 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. LightingCalc.lighting 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.