Generator Size Wattage Ca

**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.