Heat Sink Sizing Calculator - Rough Estimate  
 
   
Estimate the overall volume of the heat sink required to cool a heat source by using the following equation:  
V= (Q*Rv)/Delta T  
Heat sink volume in cm3 = (heat source power in watts x volumetric thermal resistance) / (Tjunction - maximum ambient temperature)
 
 
Inputs (in yellow)  
Heat Source Power (Q) Watt  
Tjunction (manuf supplied) Deg. C      
Max Ambient Temperature Deg. C      
Delta - T (Calculated) Deg. C  
Volumetric Thermal Resistance (Rv)    
(refer to table at right)      
Estimated Heat Sink Volume cm3  
       
Desired Heat Sink Volume      
Length cm      
Width  cm      
Height (base plus fin) cm      
Desired Heat Sink Volume cm3      
       
Your Desired Heat Sink Size is  
 
     
Reference                
https://www.electronics-cooling.com/1995/06/how-to-select-a-heat-sink/