UGR Calculator

Calculate Unified Glare Rating (UGR) for any room and luminaire combination. Check compliance against EN 12464-1 limits for offices, classrooms, healthcare, and industrial spaces — with anti-glare measure recommendations to bring UGR within spec.

Room dimensions and reflectances
Eye level assumed at 1.2m (seated office worker)
Luminaire specification
Avg luminance at 65° from vertical — from datasheet
Used to calculate background luminance Lb
Application

Please enter room dimensions, luminaire luminance, and illuminance.

Calculated UGR
0
✅
Compliant
UGR scale — your result on the comfort-to-glare spectrum
10 (imperceptible)161922252830+ (intolerable)
Your UGR
Limit for space type
0
Room index (K)
0
Background Lb (cd/m²)
0
Lum. solid angle (msr)
0
UGR limit
Calculation breakdown
EN 12464-1 UGR limits by application
Space typeEm (lux)UGR maxStatus
Anti-glare measures — how to reduce UGR
Room / space
Calculated UGR
UGR limit (EN 12464)
Background luminance Lb
Luminaire luminance at 65°
Room index K
Compliance margin
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The calculators and tools on LightingCalc.lighting 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. LightingCalc.lighting 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.