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Cooling System Calculator

Calculate engine cooling requirements and component sizes

Quick Samples
Try these common configurations to get started

150HP Diesel Inboard

Common mid-size diesel

300HP Gasoline Inboard

V8 gas engine

50HP Sailboat Diesel

Auxiliary sailboat engine

Hull Dimensions
Enter your boat's principal dimensions
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About This Tool
This calculator helps determine the basic requirements for a marine engine's cooling system. It estimates the total heat the system must dissipate and the necessary raw water flow rate to maintain proper engine temperature.

Key Concepts:

Heat Rejection: The waste heat an engine produces (BTU/hr).
Delta-T: The temperature difference between water and the engine.
Flow Rate: The volume of water (GPM) needed to remove heat.
Heat Exchanger: Transfers heat from engine coolant to raw water.
Frequently Asked Questions

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