Generator Wattage Calculator

Generator sizing calculator, calculate required running & starting watts and recommends the best generators based on selected items.

Easily calculate the exact size generator you need for your home, RV, or professional worksite with the ultimate Generator Wattage Calculator by Generator Fixer! Finding the right portable or standby generator can be confusing. If you buy one that's too small, it won't power your essential appliances. If you buy one that's too big, you waste money on fuel and the generator itself. This tool solves that problem in seconds. ⭐ KEY FEATURES: • 100+ Pre-Loaded Appliances: Choose from a huge list of Home, Recreational (RV/Camping), and Professional (Jobsite) appliances. • Accurate Wattage Calculation: Automatically calculates both Total Running Watts and Peak Starting Watts. • Altitude Adjustment: Generator power drops at higher altitudes. Our built-in altitude calculator adjusts your required wattage automatically based on your location above sea level! • Custom Appliance Tool: Have a specific device not on the list? Easily add custom running and starting watts. • Live Generator Recommendations: Get instant suggestions for the best generator brands (Honda, Generac, Champion, Westinghouse, etc.) that match your exact power needs. • Compare Prices: Direct links to check the latest prices and offers. Whether you are preparing for a power outage, planning a camping trip, or running heavy power tools, the Generator Wattage Calculator ensures you get the perfect fit. Powered by Generator Fixer - Your trusted source for generator reviews, guides, and tips.