Lighting Calculator — Free Online Calculator
Calculate how many lumens and fixtures you need for any room based on size and use.
How to Use This Calculator
Enter room dimensions, select room type, and bulb brightness to find how many bulbs you need.
The Formula Explained
Total lumens = Room area × Lumens per square foot (varies by room type: 10-70 lm/sqft). Number of bulbs = Total lumens / Lumens per bulb.