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Calcimator

Carbon Filter Sizing Calculator

Size your activated carbon filter based on room volume, plant count, and odor intensity.

Inputs

cu ft

Results

Required Filter CFM

140 CFM

Filter Diameter

4 in

Estimated Filter Life15 months
Replacement Cost$50.00
How to Use This Calculator
  1. Calculate your grow room volume (Length × Width × Height in feet) and enter it in the Room Volume field.
  2. Enter the number of plants — more plants produce more odor, which increases the required CFM rating.
  3. Select your odor level: 1=Low (herbs), 2=Moderate, 3=High (strong-smelling flowering plants).
  4. Read the Required Filter CFM and recommended Filter Diameter to select the correct carbon filter size.
  5. Note the Estimated Filter Life (months) and Replacement Cost to budget for ongoing operating expenses.

How the result changes with Room Volume

Room VolumeRequired Filter CFMFilter Diameter
509657 CFM8 in
1,7572,217 CFM12 in
3,2544,088 CFM12 in
4,5015,647 CFM12 in

What each input means

Room Volume
Cubic footage of your grow space (L × W × H).
Number of Plants
More plants produce more odor requiring higher CFM.
Odor Level
Select the odor level

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Room Volume = 96, Number of Plants = 4, Odor Level = 2 = 3 input(s) provided
  2. Calculate Required Filter CFM
    Required Filter CFM
    140 = 140
  3. Calculate Filter Diameter
    Filter Diameter
    4 = 4
  4. Calculate Estimated Filter Life
    Estimated Filter Life
    15 = 15

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

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