Bilge Pump Size & Flow

An undersized bilge pump can sink your boat. Oversized pumps blow fuses and flatten batteries. This app matches pump capacity to your hull size, head loss, and ABYC standards. PUMP SIZING CALCULATOR - Enter boat length, beam, hull type, hose length, and thru-hull count. Calculates minimum GPH, head loss adjustment, effective pump capacity, and recommends the right pump with power draw. PUMP CHART - Compare 500 to 3500 GPH pumps with typical head loss curves, boat length ranges, and amp draw at 12V. HOSE GUIDE - Match hose diameter to pump capacity. Shows max flow rate, head loss per foot, and recommended pump pairing for 3/4 to 2 inch hose. ABYC COMPLIANCE - H-22 standard checklist with minimum pump capacity by boat length, required number of pumps, float switch requirements, and wire gauge reference. Built for marine surveyors, boat builders, and yacht owners. Works offline. No account or login required.