Calculate fish to plant ratios
Grow Bed Size
100
gal
Grow Bed Area
13.4
sq ft
Max Fish
33
(50 lbs)
Daily Feed
340g
26
leafy green plants (lettuce, herbs, etc.)
Fruiting plants (tomatoes, peppers) require 2-4x more space per plant.
Inputs
Result
Grow bed = 100 x 1.0 = 100 gal (13.4 sq ft). Max fish = 100 x 0.5 = 50.0 lbs, or 33 tilapia at 1.5 lbs each. Feed = 50 x 0.015 x 453.592 = 340 g/day. Plants = floor(13.4 x 2) = 26.
Inputs
Result
Grow bed = 200 x 1.5 = 300 gal (40.1 sq ft). Max fish = 200 x 0.25 = 50.0 lbs, or 500 goldfish at 0.1 lbs each. Feed = 50 x 0.015 x 453.592 = 340 g/day. Plants = floor(40.1 x 2) = 80.
For media bed systems, use a 1:1 ratio of fish tank volume to grow bed volume. NFT systems can use 1:0.5, while deep water culture (DWC) systems often use 1:1.5 or higher.
A common rule is 1 pound of fish per 5-10 gallons of fish tank. Tilapia can be stocked at 1 lb per 2-3 gallons with good filtration. Start conservative and increase slowly.
Feed 1-2% of total fish body weight per day. For example, 20 lbs of fish needs 0.2-0.4 lbs (90-180 grams) of feed daily. Split into 2-3 feedings.
Approximately 2 leafy green plants per square foot of grow bed. Fruiting plants like tomatoes need more space - about 2-4 square feet per plant.
Plan your growing systems
Last Updated: Feb 12, 2026
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