Chiller GPM Calculator

Water Side
Pressure Drop Method
Estimate chiller water flow from design pressure drop and current pressure readings.

EVAP Evaporator Flow

Click unit button to toggle ft H₂O / PSI
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Calculated GPM: —

COND Condenser Flow

Click unit button to toggle ft H₂O / PSI
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Calculated GPM: —

Formula used:

GPM2 = GPM1 × √(PD2 / PD1)

Explanation: This formula lets you turn a pressure drop into an estimated water flow rate. If you know what the chiller was designed for, you can use the pressure you're seeing now to figure out about where the flow is. The formula is easy but long, that's why we made this tool.

Want to compare this result to last month, document changes, or hand this to a customer? That requires a structured log.