Free powerhead and flow calculator. Enter tank size + livestock type, get target turnover (GPH) + recommended powerhead count and brand suggestions.
Tank turnover (total water moved per hour รท tank volume) is a key spec for reef + cichlid tanks. Most return pumps provide ~5x turnover; the rest comes from in-tank powerheads.
Wave-mode powerheads (EcoTech MP, Maxspect Gyre, Tunze Turbelle) produce the random/pulse flow patterns reef coral and fish evolved with - far healthier than steady-stream powerheads of equal GPH.
Browse the full calculator library for tank stocking, water change, dosing, PAR, electricity cost, heater sizing, CO2 BPS, salt mix, and more.