Generator Size & Wattage Calculator

by https://portablegenguide.com · portablegenguide.com · Tools

Manifest V3 Free

View in Chrome Web Store Data as of 17 Oct 2026

Calculate generator size based on running and startup watts. Simple, transparent, and fully manual wattage input.

Users

+1 in 30 days

Rating

0.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#332K

#261K among extensions

Version

1.0.0

updated 12 Jan 2026

Users

monthly, 9 months

Latest, 17 Oct 2026: 3 usersMove the mouse over the chart for any month

Ratings count

monthly, 9 months

Latest, 17 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Generator Size & Wattage Calculator

**Generator Size & Wattage Calculator** helps you estimate the generator capacity you need based on the wattage values you enter. You can add your own appliances, input running watts and optional startup watts, and instantly see: - Total running load - Peak startup surge - Recommended generator size with a safety margin This calculator does **not guess or auto-fill wattage values**. All results are calculated solely from the numbers you provide, ensuring full transparency and control. Designed for: - RV and camper generator sizing - Home backup power planning - Portable generator comparison - Learning how generator wattage requirements work All calculations run locally in your browser. No data is collected, stored, or transmitted.