Lighting Calculator

Find lumens needed for a room.

Lumens needed (lm) 5,000

Step-by-step with your numbers:

1. Values used:

2. Room area = 250

3. Target lumens/ft² = 20

4. Lumens needed = Room area x Target lumens/ft² = 250 x 20 = 5,000lm

Did we solve your problem today?

Estimate total lumens to adequately light a room.

The math behind it

lumens = area × target lumens/ft². Living rooms ~10–20, kitchens ~30–40 lm/ft².

How many fixtures?

Divide total lumens by each fixture's lumen output.