ReadyHome calculators and tools

Backup power

Generator size calculator

Estimate running and starting wattage for your must-power loads.

Always confirm with a licensed electrician for panel tie-ins.

Backup power

Fridge/freezer outage calculator

Use official food-safety baselines with practical adjustments.

Backup power

Portable power station runtime calculator

Estimate runtime from watt-hours, load, efficiency, and duty cycle.

Check inverter limits and surge ratings.

Water damage

Sump pump battery backup calculator

Estimate backup runtime for sump pump loads during a storm.

Battery backup is not flood-proofing.

Wildfire smoke

Air purifier size calculator

Estimate smoke CADR from room size and ceiling height.

Reduces exposure. Does not make a room smokeproof.

Backup power

CPAP battery backup guide

Careful device-backup planning with medical caveats.

Educational only. Confirm with manufacturer and medical provider.

Water damage

Water leak detector placement

Where to put sensors so they actually catch leaks early.

Backup power

Keep Wi-Fi on during an outage

Low-draw backup options for internet and small electronics.

Wildfire smoke

DIY box fan filter guide

Build a temporary particle filter when nothing else is available.

Water damage

Basement flooding prevention checklist

Exterior grading, gutters, sump checks, and backup planning.

Emergency kits

Emergency food and water storage

Shelf-stable food, water planning, rotation, and pet needs.