To calculate the approximate electrical load of a building or a given area, follow these steps: Identify the end-use loads: Determine the electrical loads from different equipment, appliances, and lighting fixtures in the building or area. Determine the power consumption: Find the power consumption rating of each electrical load in kilowatts . Calculate the total load: Sum up the power consumption of all the electrical loads to determine the total load in kW.Consider demand factors: Adjust the total load to account for the maximum demand of the electrical system during peak hours.Size the electrical service: Based on the total load, determine the required size of the electrical service, including the main breaker, service wires, and service entrance equipment.Note: This is a general approach and the exact calculation may vary based on local codes and regulations, building usage, and other factors. It is recommended to consult a licensed electrician or engineer for a more accurate assessment of electrical load.