Light Bulb Brightness Calculator (Watts to Lumens)

Watts to Lumens Calculator

Convert old incandescent watts to LED lumens (and back) so you buy the right brightness bulb.

Lumens measure brightness; watts measure energy use. LEDs produce roughly 80-100 lumens per watt, so a 60W incandescent (800 lm) is matched by a ~8-10W LED. Always shop by lumens, not watts.
Upgrading bulbs? Shop LED light bulbs, smart bulbs and ceiling lights. Read the color temperature guide.
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Watts to lumens for LED bulbs

Shop by lumens, not watts. Classic equivalents: 40W ≈ 450 lm, 60W ≈ 800 lm, 75W ≈ 1100 lm, 100W ≈ 1600 lm. An LED hits those numbers using about 80–85% less energy. Also check the color temperature (Kelvin): 2700K is warm white, 5000K is daylight.

Incandescent Lumens LED watts
40W 450 5-6W
60W 800 8-10W
75W 1100 11-13W
100W 1600 15-18W