Overview
Calculate generator size based on running and startup watts. Simple, transparent, and fully manual wattage input.
**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.
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Details
- Version1.0.0
- UpdatedJanuary 12, 2026
- Size67.44KiB
- LanguagesEnglish
- DeveloperWebsite
Email
canheting@gmail.com - Non-traderThis developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.
Privacy
Generator Size & Wattage Calculator has disclosed the following information regarding the collection and usage of your data. More detailed information can be found in the developer's privacy policy.
Generator Size & Wattage Calculator handles the following:
This developer declares that your data is
- Not being sold to third parties, outside of the approved use cases
- Not being used or transferred for purposes that are unrelated to the item's core functionality
- Not being used or transferred to determine creditworthiness or for lending purposes
Support
For help with questions, suggestions, or problems, visit the developer's support site