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Calcimator

NFT Channel Design

Design a Nutrient Film Technique (NFT) hydroponic system by calculating channel count, pump capacity, plant spacing, and flow velocity from your plant count and layout.

Inputs

ft
GPH

Results

Channels Needed

6

Total Pump Capacity

180 GPH

Pump Capacity (GPM)3 GPM
Plant Spacing9.6 inches
Total Channel Length48 ft
Flow per Plant3 GPH
Min Reservoir Size60 gal
Recommended Reservoir120 gal
Flow Velocity2.41 ft/min
Flow AssessmentHigh — monitor root health
How to Use This Calculator
  1. Enter your total plant count, desired plants per channel, and channel length in feet.
  2. Enter the flow rate per channel in GPH — NFT channels typically run 0.5–2 GPH per channel for a thin nutrient film.
  3. Review Channels Needed, Total Pump Capacity (GPH/GPM), and Plant Spacing (inches).
  4. Use Min Reservoir Size (gal) and Recommended Reservoir to select a reservoir that prevents the solution from recirculating too quickly.
  5. Check Flow Assessment and Flow per Plant (GPH) to confirm adequate nutrient delivery without flooding the channels.

How the result changes with Total Plants

Total PlantsChannels NeededTotal Pump Capacity
501511,530 GPH
1,7511765,280 GPH
3,2503259,750 GPH
4,50045013,500 GPH

What each input means

Total Plants
Total number of plant sites in the NFT system. Plan for the maximum number you want to grow simultaneously.
Plants per Channel
Number of plant sites per channel. Lettuce: 8-12 per 4 ft channel. Strawberries: 6-10. Keep channels under 40 ft for even nutrient distribution.
Channel Length
Length of each NFT channel in feet. Longer channels (>15 ft) may have nutrient depletion at the end. Most home systems use 4-10 ft channels.
Flow Rate per Channel
Gallons per hour flowing through each channel. NFT standard is 15-60 GPH (0.25-1 GPM) per channel for a thin nutrient film.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Total Plants = 60, Plants per Channel = 10, Channel Length = 8, Flow Rate per Channel = 30 = 4 input(s) provided
  2. Calculate Channels Needed
    Channels Needed
    6 = 6
  3. Calculate Total Pump Capacity
    Total Pump Capacity
    180 = 180
  4. Calculate Pump Capacity
    Pump Capacity
    3 = 3
  5. Calculate Plant Spacing
    Plant Spacing
    9.6 = 9.6

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