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Generator Sizing Calculator

This calculator is designed to estimate the power consumption of a job site. The generator should be oversized to compensate for starting motor loads and other items which may have been forgotten. Always consult a sales person prior to purchase.


To use this calculator, select the wattage of the appliances you wish to use. Enter the quantity of each appliance. This will provide you with a sub-total, this number can be modified for your convenience. All of the sub-totals are then totaled at the bottom.

Download Generator Sizing Calculator

Appliance
Range
Wattage
Quantity
Sub-Total
Hand Drill
350-600
Qty:
Watts
Circular Saw
1400
Qty:
Watts
Air Compressor
2200
Qty:
Watts
Heavy Duty Motors
720-6800
Qty:
Watts
Refrigerator
300-800
Qty:
Watts
Freezer
300-600
Qty:
Watts
Electric Range w/ Oven
5000-18000
Qty:
Watts
Microwave Oven
800-1600
Qty:
Watts
Coffee Maker
800-1500
Qty:
Watts
Well Pump
500-2000
Qty:
Watts
Electric Water Heater
1500-5000
Qty:
Watts
Furnace Fan
5000-18000
Qty:
Watts
Sump Pump
500-1250
Qty:
Watts
Electric Heater
500-4000
Qty:
Watts
Radio
50-200
Qty:
Watts
Television
100-600
Qty:
Watts
Window Air Conditioner
500-1500
Qty:
Watts
Central Air Conditioner (4000Watts / ton)
1.5 - 5 ton
Qty:
Watts
Electric Fan
200-350
Qty:
Watts
Humidifier
100-250
Qty:
Watts
Dehumidifier
100-250
Qty:
Watts
Computer Equipment
500-800
Qty:
Watts
Copy Machine
1000-2000
Qty:
Watts
Fax Machine
150-300
Qty:
Watts
Security System
400-550
Qty:
Watts
Flood Lights
250
Qty:
Watts
Lighting
25-100
Qty:
Watts
Lighting
25-100
Qty:
Watts
Lighting
25-100
Qty:
Watts
Watts
Watts
Watts
Watts
Watts
Total:
Total horsepower needed: