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Calcimator

Cannabis Grow Room Layout Calculator

Plant count from canopy area and training method.

Inputs

%

Results

Max plant count

112

Canopy area (sq ft)225
Total floor (sq ft)300
Walkway area (sq ft)75
Number of rows5
Plants per row14
Light fixtures needed15
Sq ft per plant2
How to Use This Calculator
  1. Enter room length and width in feet.
  2. Select training method (no training, LST/SCROG, SOG, or mainline) — this sets spacing per plant.
  3. Set walkway allowance (%) and row spacing (inches).
  4. Review Max Plant Count, Canopy Area (sq ft), Number of Rows, and Light Fixtures Needed.

How the result changes with Room length (ft)

Room length (ft)Max plant count
51286
176990
3251,828
4502,531

What each input means

Room length (ft)
Interior length of the grow room in feet.
Room width (ft)
Interior width of the grow room in feet.
Training method (0-3)
0 = No training (~2 sq ft/plant), 1 = LST/SCROG (~4), 2 = SOG (~1), 3 = Mainline (~6).
Walkway allowance (%)
Percentage of floor area reserved for aisles and equipment access.
Row spacing (in)
Center-to-center row spacing in inches.

What each result means

Max plant count
Maximum plants that fit the usable canopy area.
Canopy area (sq ft)
Usable growing area after walkway deduction.
Total floor (sq ft)
Total room floor area.
Walkway area (sq ft)
Area reserved for aisles.
Number of rows
Estimated rows based on spacing.
Plants per row
Plants fitting in each row.
Light fixtures needed
Estimated fixtures at 4×4 ft coverage each.
Sq ft per plant
Canopy footprint per plant for the chosen training method.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Room length (ft) = 20, Room width (ft) = 15, Training method (0-3) = 0, Walkway allowance (%) = 25 = 5 input(s) provided
  2. Calculate Max plant count
    Max plant count
    112 = 112
  3. Calculate Canopy area
    Canopy area = totalFloorSqFt - walkwaySqFt
    225 = 225
  4. Calculate Total floor
    Total floor = roomLengthFt * roomWidthFt
    300 = 300

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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