Lighting Calculator
Find out how many lumens your room needs and how many lamps or fixtures to install. The calculator uses typical illuminance levels by room type and adds a reserve for ceiling height.
Lighting Calculator
Calculate how many lumens you need and how many lamps to install based on room area and type.
Typical LED bulb: 800–1200 lm. Spotlights: 300–600 lm each.
10–15% for height and reflection loss.
Instructions
- Enter room length and width in meters.
- Select room type — the calculator uses standard lux norms (living 150, kitchen 250, office 300, etc.).
- Enter lumen per lamp (see packaging; typical LED bulb 800–1200 lm).
- Get total lumens and recommended number of lamps. Add 10–15% reserve for ceiling height.
Next step after lighting
Once the light level is set, the next practical step is usually palette work or the full room budget.
Area
Area = length × width in meters. Measure the room floor wall to wall.
Lux
Typical values: living room and bedroom 150 lux, kitchen 250, office 300, hallway 100.
Lumens per lamp
Check the packaging. A common LED bulb often delivers around 800–1000 lumens.