Generator Sizing Calculator
Calculate the right generator wattage for your power needs.
Essential Appliances
High-Power Appliances
Other Appliances
Lights & Electronics
Recommended Generator Size
3,500W
portable generator
Power Requirements
Running Watts850W
Starting Watts1,200W
Recommended (w/ 20%)1,440W
Load Breakdown
Major Appliances1 items
Lighting Load300W
Electronics Load400W
Fuel Estimates (50% Load)
Gas per Hour~0.72 gal
Runtime (5 gal tank)~6.9 hrs
Runtime (8 gal tank)~11.1 hrs
Safety Tips:
- Never run generators indoors or in enclosed spaces
- Keep at least 20 feet from windows and doors
- Use proper extension cords rated for outdoor use
- Consider a transfer switch for safe home connection
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.