Lumen to Watt Converter

Convert between lumens and watts for different light sources. Calculate equivalent wattages, energy savings, and find incandescent replacements using ENERGY STAR standards.

ENERGY STARIES Handbook
Light Output Conversion
Enter your light output value and select a light source type to calculate equivalent wattages.
Lumens to WattsWatts to Lumens
lm

Total luminous flux (light output) - typically printed on bulb packaging

Different light sources have different luminous efficacy (lm/W)Typical efficacy: 100 lm/W