Marine safety planning calculator

Bilge pump and emergency battery sizing

Estimate derated pumping flow, pump current and battery runtime for a defined emergency planning interval.

Pump rated flow (L/min)Flow derating for head (%)Number of pumpsCurrent per pump (A)Battery capacity (Ah)Usable battery dischargeBattery voltage (V)Emergency interval (hours)

Emergency estimate

Effective flow

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Total pump current

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Battery runtime

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Water moved in interval

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Safety and limitations

This tool provides an early planning estimate only; it is not a permit, certification, safety approval or final engineering design.
Use measured inputs and the exact manufacturer datasheets for the equipment, materials, installation method and operating environment.
Check local building, marine, electrical, gas, water, fire and environmental requirements before construction or installation.
Have a qualified professional verify the final design, protection devices, structure, ventilation, drainage, emergency systems and commissioning tests.
This result does not model every site condition, structural detail, weather event, emergency condition or code requirement.

If an input is unknown or the result is close to a limit, stop and obtain the missing documentation or professional verification.