The Room Lighting Calculator.
Most lighting plans go wrong because they're built around fixtures instead of around the room. This calculator works the other way. Enter the dimensions, the ceiling height, and the natural light level. The output is a target for ambient, task, and accent lighting in that specific room, plus how many fixtures it takes to hit it.
The framework comes from Guide 01. The calculator is free. Use it as many times as you need.
Length ft
in
Width ft
in
Ceiling ft
in
Room dimensions must be at least 2 feet.
4" casts a tighter beam. Same brightness target, more fixtures, cleaner ceiling.
Enter your room details
to see the plan.
Your Lighting Plan
Next Step
These are your targets. The Residential Lighting Reference Guide covers the exact mounting heights, spacing formulas, and specifications behind every number above.
See Guide 01 · $37The calculator handles the math.
Guide 01 covers the rest. Fixture types, color temperature, three-layer composition, and the room-by-room application specs the calculator doesn't have space for.
See Guide 01