How Long Will Your Backup Power Last?
Use this simple calculator to estimate how much power your essential devices may use during an outage and how long your battery or power station may last.
Power Planning Brings Peace.
You do not need to power everything. Start by identifying the few devices that matter most: phones, lights, medical needs, small fans, radios, or communication tools.
This calculator gives an estimate only. Always follow manufacturer safety instructions for batteries, generators, extension cords, and medical devices.Battery & Amp Power Calculator
Enter your battery size and the devices you want to run. Use watts if you know them, or amps and volts if that is what your device label shows.
Your Backup Power Estimate
Recommended Next Steps
Battery & Amp Power Calculator Report
Prepared by Healthy Souls International
Your battery estimate will appear here.
Your daily use estimate will appear here.
Your summary will appear here.
This calculator is only an estimate. Always follow product manuals, generator safety rules, battery safety instructions, and medical device guidance. Never run fuel-powered generators indoors.
What Should You Power First?
During an emergency, choose the most important items first. Keep your plan simple, safe, and realistic.
Communication
Phones, radios, and small chargers help your family stay connected and receive updates.
Build PlanLight & Safety
Small LED lights, flashlights, and safe lighting can reduce falls and fear during power outages.
Senior ChecklistMedical Needs
Medical equipment needs careful planning. Always follow doctor, manufacturer, and emergency guidance.
Family ScorePower Planning Helps Families Stay Calm.
Use this estimate, write down your most important devices, build a communication plan, and share preparedness tools with someone you love.