Office Lighting Design Calculator

Design compliant office lighting to EN 12464-1 and ASHRAE 90.1 standards. Calculate fixture count, spacing, LPD, and uniformity for any office zone — from open plan to surgical precision task areas.

Measurement units
Metric
Metres, m2
Imperial
Feet, sq ft
Office zone / task type
Corridor / circulation
100 lux
EN 12464-1
Reception / lobby
200 lux
EN 12464-1
Filing / storage
200 lux
EN 12464-1
Open plan office
500 lux
EN 12464-1
Meeting / boardroom
500 lux
EN 12464-1
Reception desk task
500 lux
EN 12464-1
CAD / drawing office
750 lux
EN 12464-1
Technical / precision
750 lux
EN 12464-1
Custom target
Enter below
Any standard
Room dimensions
Overrides zone selection above
Room surfaces (reflectance)
Luminaire specification
Total output per fixture

Please enter room dimensions and luminaire lumens.

Luminaires required
0 fixtures
0
Avg illuminance (lux)
0
LPD (W/m2)
0
Room index (K)
0
Spacing (m)
Standards compliance check
CriterionRequiredAchievedStatus
Suggested fixture layout
EN 12464-1 office zone reference
Zone / taskLuxUGR maxCRI minUniform
Room area
Room index (K)
Utilisation factor (UF)
Effective lumens per fixture
Fixtures required
Total installed watts
LPD vs ASHRAE 90.1 limit
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.