Chiller Sizing Calculator

Size chiller systems based on water flow rate, temperature differential, diversity factor, and efficiency metrics.

Chilled Water Flow

GPM

Rule of thumb: 2.4 GPM/ton at 10°F ΔT; 3.0 GPM/ton at 8°F ΔT per ASHRAE

Entering Water Temp

°F

Standard CHWR: 54°F (high ΔT systems use 58–60°F for energy savings)

Leaving Water Temp

°F

Standard CHWS: 44°F; high-efficiency: 46–48°F; humidity control requires ≤45°F

Diversity Factor

Safety Factor

Tab to move between fields

Required Cooling Capacity

194.79 tons

Estimated Chiller Power

155.83 kW

Cooling Capacity2,337,500 BTU/hr

Power per Ton0.8 kW/ton

How to Use This Calculator

Enter Chilled Water Flow, Entering Water Temp, and Leaving Water Temp.
Set Diversity Factor and Safety Factor.
Review Required Cooling Capacity (tons) and Estimated Chiller Power (kW).
Use Cooling Capacity (BTU/hr) and Power per Ton (kW/ton) to inform your decision.

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