What Size Generator Do I Need?
Select your appliances, get the exact wattage you need. Running watts, starting watts, and recommended generator sizes.
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Free Emergency Planning Tools
Calculate Exactly What Your Family Needs to Survive Any Emergency
When disaster strikes, the unprepared become the vulnerable. Our free calculators use official FEMA, CDC, and Red Cross guidelines to give you a precise, actionable supply list—calculated for your exact household needs.
60%
Of Americans Lack an Emergency Plan
72+hrs
Average FEMA Response Time
14 Days
New FEMA Supply Recommendation
$6
Saved for Every $1 Spent on Prep
FEMA's Updated Recommendation
Following lessons from recent disasters, FEMA now recommends households maintain 2 weeks of emergency supplies—up from the previous 72-hour standard. Are you prepared?
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Power & Generator Calculators
Our most popular tools. Answer the questions everyone asks during power outages.
How Long Will Generator Last?
Enter your fuel capacity and load to calculate runtime. Plan your fuel storage for 3, 7, or 14-day outages.
Calculate RuntimePower Station Runtime
How long will your Jackery, Bluetti, or EcoFlow last? Calculate battery backup runtime for any device combination.
Calculate Battery RuntimeAll Emergency Preparedness Calculators
Each calculator is based on official guidelines from FEMA, CDC, and the American Red Cross. Your data stays in your browser—we never store or share your information.
Water Storage Calculator
Calculate exactly how many gallons your household needs based on family size, pets, climate, and duration. Includes container recommendations and rotation schedule.
Calculate Water NeedsFood Storage Calculator
Determine calories and pounds of food your family needs for emergency stockpiling. Covers grains, proteins, dairy, and complete nutritional breakdown.
Calculate Food NeedsGenerator Sizing Calculator
Find the right generator wattage for your needs. Select your appliances and get running watts, starting watts, fuel consumption, and size recommendations.
Size Your GeneratorEmergency Kit Calculator
Build a complete emergency kit checklist customized for your household, location, and disaster risks. Prioritized by essential, important, and nice-to-have items.
Build Your Kit ListBug-Out Bag Weight Calculator
Ensure your go-bag isn't too heavy. Calculate total weight as a percentage of body weight, get ultralight recommendations, and optimize your loadout.
Optimize Your PackFirst Aid Kit Calculator
Build a comprehensive first aid kit scaled to your family size and needs. Includes trauma kit options, child-specific supplies, and expiration tracking.
Build First Aid KitWhy You Can't Afford Not to Prepare
Disasters don't send calendar invites. When the next hurricane, earthquake, or grid failure hits your area, stores will be empty within hours. The question isn't if you'll need emergency supplies—it's when.
The 72-Hour Myth
For decades, 72 hours was the standard. But Hurricane Katrina, the Texas freeze, and countless other disasters proved that help doesn't always arrive in 3 days. Some communities waited weeks. FEMA now officially recommends 2 weeks of supplies.
Supply Chain Reality
The COVID-19 pandemic exposed how quickly store shelves empty. Toilet paper, hand sanitizer, and basic supplies vanished overnight. During a regional disaster, resupply may be impossible for days or weeks. The time to stock up is before you need it.
The Cost of Waiting
FEMA estimates that every $1 invested in disaster preparedness saves $6 in response and recovery costs. Beyond money, proper preparation saves lives. The families who survive disasters aren't lucky—they're prepared.
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Based on Official Guidelines
All calculations use recommendations from FEMA, CDC, American Red Cross, and other trusted emergency management organizations.
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Emergency preparedness shouldn't be behind a paywall. All our calculators and guides are free to use without restrictions.
The best time to prepare was yesterday
The Second Best Time is Right Now
It takes less than 5 minutes to calculate your family's emergency water needs. Start there, then build from it. Every small step makes your household more resilient.
Calculate Your Water Storage Needs