What Size Generator Do I Need?
Select your appliances and get exact wattage requirements. Running watts, starting surge, and recommended generator sizes.
Calculate Generator SizeStop guessing and start calculating. Get precise, actionable numbers based on official FEMA, CDC, and Red Cross guidelines. Your data stays in your browser.
Our most popular tools. Answer the questions everyone asks during power outages.
Select your appliances and get exact wattage requirements. Running watts, starting surge, and recommended generator sizes.
Calculate Generator SizeEnter fuel capacity and load to calculate runtime. Plan fuel storage for 3, 7, or 14-day power outages.
Calculate Generator RuntimeHow long will your Jackery, Bluetti, or EcoFlow last? Calculate battery backup runtime for any device combination.
Calculate Battery RuntimeHow long will a 20lb propane tank last? Calculate runtime for generators, heaters, stoves, and grills.
Calculate Propane RuntimeHow long to charge your power station with solar? Calculate realistic charging times based on panel size and conditions.
Calculate Solar Charge TimeWhat size UPS do you need for your computer? Calculate VA rating and runtime for home office and network equipment.
Size Your UPSHow long will your battery backup run your appliances? Calculate runtime with multiple devices and solar input.
Calculate Power RuntimeHow much fuel to store for emergencies? Calculate gasoline, diesel, or propane needs with safety guidelines.
Calculate Fuel StorageThe foundation of emergency preparedness. Calculate exactly what your household needs to survive.
Calculate gallons needed based on family size, climate, and duration. Water is your #1 survival priority.
Calculate Water NeedsDetermine calories and pounds of food by category. Complete nutritional requirements for long-term storage.
Calculate Food NeedsBuild a complete, prioritized supply checklist customized for your household and local disaster risks.
Build Kit ChecklistBuild a comprehensive medical kit scaled to your family. Includes trauma options and expiration tracking.
Build First Aid KitCalculate purification supplies needed: bleach, tablets, or filter capacity for treating water sources.
Calculate PurificationCalculate exact caloric needs during emergencies based on body composition, activity, and climate.
Calculate CaloriesWhen you need to move fast, know your limits and optimize your gear.
Ensure your go-bag isn't too heavy. Calculate weight as percentage of body weight with optimization tips.
Optimize Pack WeightHow long will it take your family to evacuate? Calculate realistic timelines based on preparedness level.
Calculate Evacuation TimeWhat radio do you need? Calculate range requirements based on terrain and distance to family members.
Calculate Radio RangeAddress specific needs for your household's unique requirements.
Don't forget your furry family members. Calculate food, water, and supplies for dogs, cats, and more.
Calculate Pet SuppliesPlan OTC and prescription medication supplies. Includes storage tips and expiration tracking.
Plan Medication SupplyPlan your preparedness spending. See cost breakdowns and prioritize purchases by importance.
Plan Your BudgetDetermine how many people can shelter in your space and supplies needed for extended stays.
Calculate CapacityStart with the basics: water is your most critical survival resource, and power keeps your essentials running. Pick one and begin.