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Calcimator

Space Programming Calculator

Net-to-gross area from programmatic requirements.

Inputs

Results

Gross area (GSF)

7,073

Grossing factor

1.22

Total net area (NSF)5,800
Usable area (USF)6,496
Loss area (sq ft)1,273
Efficiency (%)82
Est. corridors (sq ft)446
Est. restrooms (sq ft)191
Est. mechanical (sq ft)255
Est. occupants79
Gross SF/person89.5
Wall Thickness (sq ft)190.98
Elevator Lobby (sq ft)190.98
How to Use This Calculator
  1. Enter Private offices (NSF), Open office (NSF), and Conference rooms (NSF).
  2. Set Support spaces (NSF), Reception/lobby (NSF), and Building type (0-5).
  3. Review Gross area (GSF) and Grossing factor.
  4. Use Total net area (NSF) and Usable area (USF) to inform your decision.

How the result changes with Open office (NSF)

Open office (NSF)Gross area (GSF)Grossing factor
20,00027,8051.22
70,00088,7801.22
130,000161,9511.22
180,000222,9271.22

What each input means

Private offices (NSF)
Net square feet for private offices.
Open office (NSF)
Net square feet for open workstations.
Conference rooms (NSF)
Net square feet for conference and meeting rooms.
Support spaces (NSF)
Copy rooms, storage, server, mail, etc.
Reception/lobby (NSF)
Reception area and waiting space.
Building type (0-5)
0=Office A, 1=Office B, 2=Retail, 3=Healthcare, 4=Education, 5=Hospitality.

What each result means

Total net area (NSF)
Sum of all programmatic net areas.
Usable area (USF)
Net area plus internal circulation (BOMA usable).
Gross area (GSF)
Total building area needed including all common areas.
Loss area (sq ft)
Common area not assignable to program (corridors, mechanical, etc.).
Grossing factor
Multiplier from net to gross (e.g., 1.22 = 22% loss).
Efficiency (%)
Net-to-gross efficiency percentage.
Est. corridors (sq ft)
Estimated corridor and circulation area.
Est. restrooms (sq ft)
Estimated restroom area allocation.
Est. mechanical (sq ft)
Estimated mechanical/electrical room area.
Est. occupants
Estimated headcount based on space allocations.
Gross SF/person
Gross square feet per estimated occupant.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Private offices (NSF) = 1500, Open office (NSF) = 3000, Conference rooms (NSF) = 600, Support spaces (NSF) = 400 = 6 input(s) provided
  2. Calculate Gross area
    Gross area = totalNetSqFt * grossingFactor
    7073 = 7073
  3. Calculate Grossing factor
    Grossing factor = 1 / efficiency
    1.22 = 1.22
  4. Calculate Total net area
    Total net area = privateOfficesSqFt + openOfficeSqFt + conferenceSqFt + supportSqFt + receptio...
    5800 = 5800
  5. Calculate Usable area
    Usable area = totalNetSqFt * internalCirculationFactor
    6496 = 6496

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