Real Power Calculation

This web page can be used to calculate the real power (kw) of a single phase or three phase load.  Use Table one for three phase calculations, and use Table two for single phase calculations. The three phase load calculations assume the load is balanced.

Table 1 - Calculation of Total Power Three Phase Loads

Known Variables: Load Voltage, Load Current, Load Power Factor Angle  




Input System Line-Line Voltage (kv)
Input line current (amps)
Input power factor angle of load (degrees)
Calculated Real Power (kva)

Known Variables: Total Power (kva), Reactive Power (kvar)  

Input Three Phase Total Power  (kva)
Input Three Phase Reactive Power (kvar)
Calculated Power (kw)

Table 2 - Calculation of Total Power Single Phase Loads 

Known Variables: Load Voltage, Load Current, and Power Factor Angle of Load


Input System Line to Neutral Voltage (kv)
Input Line Current (amps)
Input Power Factor Angle (degrees)
Calculated Total Power (kw)

Known Variables: Real Power, Reactive Power  

Input Single Phase Total Power  (kva)
Input Single Phase Reactive Power (kvar)
Calculated Power (kw)

Northeast Power Systems, Inc.
66 Carey Road
Queensbury, New York 12804
Phone: 518-792-4776
Fax: 518-792-5767

E-mail: sales@nepsi.com
Website: http://www.nepsi.com/