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Calcimator

Nutrient Schedule Calculator

Feed concentration by growth stage and medium.

Inputs

%

Results

Target PPM

1,000

PPM to add950
Target EC (mS/cm)2
Concentrate (mL/gal)4.8
Total concentrate (mL)95
Reservoir life (days)4
Daily water use (gal)5
N ratio (%)43
P ratio (%)14
K ratio (%)43
How to Use This Calculator
  1. Select the current growth stage (seedling through flush).
  2. Enter reservoir size in gallons, nutrient strength (%), tap water PPM baseline, and plant count.
  3. Review Target PPM, Target EC (mS/cm), Concentrate (mL/gal), and Reservoir Life (days).
  4. Check N, P, and K ratio outputs to confirm they match stage-appropriate emphasis.

How the result changes with Nutrient strength (%)

Nutrient strength (%)Target PPM
38380
69690
1061,060
1381,380

What each input means

Growth stage (0-5)
0 = Seedling, 1 = Early veg, 2 = Late veg, 3 = Early flower, 4 = Mid flower, 5 = Flush.
Reservoir size (gal)
Reservoir or feed tank capacity in US gallons.
Nutrient strength (%)
Percentage of recommended nutrient concentration (reduce for sensitive strains).
Tap water PPM
Dissolved solids in your water before adding nutrients (TDS reading).
Number of plants
Plants feeding from this reservoir.

What each result means

Target PPM
Final target PPM for the nutrient solution.
PPM to add
PPM of nutrients to add above baseline water.
Target EC (mS/cm)
Equivalent electrical conductivity.
Concentrate (mL/gal)
Milliliters of concentrate per gallon of water.
Total concentrate (mL)
Total mL of concentrate for the full reservoir.
Reservoir life (days)
Days before the reservoir is depleted.
Daily water use (gal)
Estimated daily water consumption by plants.
N ratio (%)
Relative nitrogen emphasis for this stage.
P ratio (%)
Relative phosphorus emphasis for this stage.
K ratio (%)
Relative potassium emphasis for this stage.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Growth stage (0-5) = 2, Reservoir size (gal) = 20, Nutrient strength (%) = 100, Tap water PPM = 50 = 5 input(s) provided
  2. Calculate Target PPM
    Target PPM = round(basePpmTarget * (nutrientStrengthPct / 100))
    1000 = 1000
  3. Calculate PPM to add
    PPM to add
    950 = 950
  4. Calculate Target EC
    Target EC
    2 = 2

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