Space type
Office
0.98 W/ft² (90.1)
Conference
1.23 W/ft²
Retail
1.26 W/ft²
Classroom
1.07 W/ft²
Warehouse
0.58 W/ft²
Restaurant
0.89 W/ft²
Corridor
0.66 W/ft²
Restroom
0.89 W/ft²
Parking garage
0.15 W/ft²
Lobby
0.90 W/ft²
Gym
1.20 W/ft²
Custom
Enter limit below
Code reference
ASHRAE 90.1-2019
IECC 2021
Title 24-2022 (CA)
Custom limit
Space dimensions
Fixture schedule
Fixture type
Qty
W each
Subtotal
Lighting Power Density
—
W/ft²
Allowed LPD
—W/ft²
—
—
—
Total installed watts
—
Max allowed watts
—
Watts remaining / over
—
Total fixture count
Default code:
Area units:
ASHRAE 90.1-2019
IECC 2021
Title 24
Room name
Space type
Area
Watts
LPD
Limit
Status
Total floor area—
Total installed watts—
Total max allowed watts—
Project-wide LPD—
Overall status
—
⚠ Planning estimate only. This calculator provides general reference values based on ASHRAE 90.1-2019, IECC 2021, and California Title 24-2022 space-by-space LPD limits. Code allowances vary by jurisdiction, code year, project type, exemptions, and local amendments. Always verify compliance with the applicable adopted energy code and a qualified energy consultant or lighting designer before permit submission.
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