Chiller Capacity Calculator Home » Chiller Capacity Calculator Chiller Capacity Calculator What liquid is being used to chill? Water Other Fluid Calculate Chiller Capacity Using WaterGPM = Water Flow Rate (gal/min)Water Temperature Inlet (°F)Water Temperature Outlet (°F)Q = Heat Load (BTU/hr)This indicates the size of the chiller you need.Calculate Chiller Capacity Using Non-Water FluidGPM = Fluid Flow Rate (gal/min)SG = Fluid Specific GravityC = Specific Heat of FluidWater Temperature Inlet (°F)Water Temperature Outlet (°F)Q = Heat Load (BTU/hr)This indicates the size of the chiller you need. Δ