Printable Generator Wattage Estimator
This generator sizing workbook is for anyone planning backup power for a home, cabin, or jobsite. It gives one Letter-size page with a generator sizing worksheet and rows for appliances that will run at the same time. The columns are Appliance, Qty, Running W, Starting W, Total running W, and Extra surge W. Example entries include Refrigerator, Sump pump, and LED lights with sample wattage values.
Free printable · PDF
- 1 page
- US Letter — choose “Fit to page” for A4
- PDF, 52 KB
Free for personal, family and classroom use.
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List each appliance you want to power, then fill in the quantity, running watts, and starting watts. Add the items together, then use the worksheet’s method, which adds the largest surge and a 20% margin, to estimate generator wattage needs.
Good for
- Estimate generator size for home backup power
- Compare appliance loads before buying a generator
- Check surge needs for motors and pumps
Tip: Print it and fill it in with pencil so you can adjust wattage numbers as needed.
6 files · XLSX, PDF, DOCX
Get every sheet: Generator Sizing Worksheet Pack
This sheet plus 5 more in one download, with the editable Excel and Word files. Excel generator sizing worksheet, 60+ appliance wattage chart, printable sizing and load priority sheets, safety checklist and fuel log.
$5.00 USD, one-time 6 files · about $0.83 each
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