Footcandle Calculator
Use this footcandle workflow to estimate average illuminance from entered lumens and area before checking a full lighting layout.
- Average illuminance
- fc
- Average illuminance
- lux
- Effective lumens
- lm
- CU x LLF factor
- x
Calculation details
- Calculation basis
- Design boundary
Recent results
Formulas
- Effective lumens = lumens x CU x LLF
- Footcandles = effective lumens / area
- Lux = footcandles x 10.76390625
Use this calculator
Estimate footcandles and lux from lumens, area, utilization, and light loss factor.
Read the result
Review the calculated values with their displayed units and assumptions. The result is a planning aid for the stated inputs, not a final equipment or installation decision.
Check before final work
This footcandle estimate is for early lighting planning. It does not replace fixture photometrics, spacing checks, glare review, energy-code review, or project lighting design.
FAQs
Is this an average footcandle estimate?
Yes. It estimates average illuminance from entered lumens and area. Real layouts depend on fixture distribution and placement.
Can I use lux instead?
The calculator returns both footcandles and lux from the same entered values.