Aquaponics System Designer

It's a fixed harvest-weight assumption built into this calculator's formulas, chosen as a reasonable approximation for grow-out tilapia and similar species commonly used in aquaponics — it isn't derived from your specific species or fish age, so if you're raising a notably larger or smaller species, or fish at an earlier growth stage, the grow bed area and feed estimates will be proportionally off from your actual biomass.

Media-based aquaponics systems are commonly designed around 1-2x tank turnover per hour through the grow beds — enough flow to keep media adequately flushed and oxygenated for the nitrifying bacteria that convert fish waste into plant-available nutrients, without moving water so aggressively that solids get pushed through before they break down. This calculator uses 1.5x as a middle-of-the-road figure, so larger tanks scale proportionally to larger recommended flow rates.

It compares your fish count to tank volume against a commonly cited hobby-scale aquaponics target of roughly 1 fish per 5-10 gallons of water — below that range there may not be enough fish waste to adequately feed the plants, while above it, fish are at greater risk of ammonia buildup and oxygen stress unless the system has extra filtration and aeration capacity beyond what this calculator assumes.

No — plant density in this calculator only affects how many total plants the grow bed area can support; it doesn't feed back into the pump flow rate or daily fish feed calculations, both of which are driven entirely by fish tank volume and fish count. In a real system, however, a much denser planting can pull nutrients and affect water chemistry in ways this simplified model doesn't capture.