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Calcimator

Emergency Lighting Calculator

Calculate emergency lighting units, exit signs, and battery capacity per NFPA 101/IBC.

Inputs

Results

Emergency Light Units

28

Exit Signs Required

6

Total Power Draw (watts)310
Battery Capacity (Wh)558
Estimated Equipment Cost$2,370.00
Duration Compliant1
How to Use This Calculator
  1. Enter Total Floor Area (sq ft), Total Corridor Length (ft), and Stairwells.
  2. Set Number of Exits and Battery Duration (hours).
  3. Review Emergency Light Units and Exit Signs Required.
  4. Use Total Power Draw (watts) and Battery Capacity (Wh) to inform your decision.

How the result changes with Total Floor Area (sq ft)

Total Floor Area (sq ft)Emergency Light UnitsExit Signs Required
50,090956
175,0653036
325,0355536
450,0107626

What each input means

Total Floor Area (sq ft)
Total floor area requiring emergency illumination.
Total Corridor Length (ft)
Combined length of all egress corridors.
Stairwells
Number of stairwells requiring emergency lighting.
Number of Exits
Number of building exits.
Battery Duration (hours)
Required battery backup duration (code minimum 1.5 hrs).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Total Floor Area (sq ft) = 10000, Total Corridor Length (ft) = 200, Stairwells = 2, Number of Exits = 4 = 5 input(s) provided
  2. Calculate Emergency Light Units
    Emergency Light Units
    28 = 28
  3. Calculate Exit Signs Required
    Exit Signs Required
    6 = 6
  4. Calculate Total Power Draw
    Total Power Draw
    310 = 310
  5. Calculate Battery Capacity
    Battery Capacity
    558 = 558

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