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💡 Lighting Fixtures Calculator

Work out how much light your room needs and how many fixtures to use — calculate your personal Brightness Blueprint.

How to Use This Calculator

  1. Enter your room's length and width in meters.
  2. Select your room type — different rooms need different brightness levels (a workshop needs far more light than a bedroom).
  3. Adjust the wall brightness slider — darker walls absorb more light, so they need a higher utilization factor to compensate.
  4. Set your fixture's lumen output — check the packaging of the bulb or fixture you plan to use (standard LED bulbs are usually 800–1,100 lumens).
  5. Read your results instantly — total lumens required and the recommended number of fixtures.

Calculate Your Brightness Blueprint

Enter your room size, pick the room type, and we'll tell you exactly how many fixtures you need for perfect lighting.

📐 Room Dimensions

🏠 Room Type

💡 Fixture Output

🎨 Utilization Factor (Wall Brightness)

0.60
0.50 (dark walls) 0.70 (bright walls)

Your Brightness Blueprint

Updates instantly as you adjust settings.

Room Area
12.0 m²
Required Lux Level
150 lux
Total Lumens Required
3,000 lm
Recommended Fixtures
4 fixtures
at 800 lm each
💡 For even coverage, space fixtures evenly across the ceiling rather than clustering them in the center of the room.

Ready to Light Up Your Space?

Use your calculated fixture count when shopping for lighting. Save or share your results below.