Free Prepper Tools: BOB Weight, Water, Solar & More

How These Tools Work

These are free worksheets. No signup. You enter this household's numbers and get a result you can print or shop from. I am a 22-year union power lineman. The math is the same math I use at home.

Use the result as a plan, then buy only what the number says you still need. Power Station Runtime is the calculator that adds a whole house load. Appliance Runtime Pages are one-appliance hours on signed stations. They are two different tools.

Water

Water Storage Calculator

Size emergency water for this household: people, days, climate, and pets. FEMA's floor is 1 gallon per person per day. The result is a shopping list, not a scare number.

Food

Food Storage Calculator

Plan calories by people and days. Use it for pantry depth at home. Apartment storage stays in the math.

Canning Altitude Chart

Type elevation in feet. Get pressure canner PSI for dial or weighted gauges, or extra water-bath minutes. USDA and NCHFP tables.

Power

Solar Power Calculator

Size panels and a power station from the loads you actually run. Location and sun hours change the result.

Power Station Runtime Calculator

Pick a station you already own, add devices, and see hours of runtime. Fridges and pumps also need nameplate start-up watts. Watt-hours on the box are not hours of fridge.

Appliance Runtime Pages

Signed-station hours for one appliance at a time: fridge, CPAP, freezer, well pump, and similar loads. The table is not a start-up clearance. The calculator that adds a whole house load is Power Station Runtime.

Power System Builder

Plan an off-grid or overland power stack and get an action list for the gaps.

Solar Compatibility Checker

See whether a panel and a station actually work together: voltage, connector, and charge time.

Continuity Twin

Run this household against grid-down, heat, and water-out packs. It pulls numbers you already entered in the other tools.

Comms

Family Comms Card

Answer a few questions and print a step-by-step radio and phone plan for your household. Your call signs stay on your device.

Radio License Path

No license, GMRS, or ham? Plain steps to get the license that fits, with the official FCC links.

Bug-Out

Bug Out Bag Weight Calculator

Build a pack from real gear and weigh it against 20 to 25 percent of body weight. Missing essentials show up as a list, not a lecture.

72-Hour Kit Builder

Answer region, climate, and household questions. Get a 72-hour checklist you can print. FEMA's 72 hours is the floor, not a plan.

Virtual Go-Bag Builder

Pick gear into a digital bag and watch the weight. Diagnostic badges open the field-failure tool for what you actually carry.

Ultralight Gear Finder

Compare backpacking gear by weight, price, and spec. Manufacturer numbers, not invented field weighs.

Tent Finder

Filter tents by weight, capacity, and setup. Specs come from the manufacturer.

Field Failure Diagnostic

Yes/no questions to isolate a failed filter, stove, solar, winch, or shelter. Standard fix first, then improvised.

Vehicle

Vehicle Profile

Payload, MPG penalties, and recovery scoring for this rig. Empty fields stay empty. PE does not invent MPG.

Fuel and Range Planner

Tank, jerry cans, and real MPG in. Range and fuel stops out. Gallons, not units.

Vehicle Load Balancer

Place gear by zone and see payload and center of gravity. Weigh what you put on the truck.

Evacuation Route Planner

Primary, secondary, and tertiary routes. Plan them before you need them.

RigSafe Rooftop Tent Check

Dynamic vs static roof load for this vehicle and rack. A rooftop tent that overloads the rack stays off the list.

RigRated Configurator

Rack, rooftop tent, awning, recovery, and power as a build list.

Rack and Rooftop Tent Fitment

Community fitment notes for racks and rooftop tents. Treat unmatched rows as NOT CHECKED.

Trail Intel

Route and terrain notes for an overland trip. Research, not a live GPS feed.

Household and more

Deadstock

Count the day this household runs out of water, food, medical, power, comms, or gear. Stored on your device.

SITREP

A household situation report for grid-down, bug-out, wildfire, pandemic, or winter storm.

SHTF Scenario Simulator

Choice-based scenarios. Your picks change the outcome. Not a prediction of a real event.

Skills Gap Analyzer

Mark skills you have. The gaps become a learning list.

Threat and Risk Dashboard

Local hazards by region so you rank water, power, and evac in the right order.

Barter Value Estimator

Relative trade value of gear and skills in a scarcity scenario. Historical cases, not a price list.

Community Gallery

Shared bags and builds from other households. Browse, don't copy a kit you cannot carry.

Prep Answers

Short answers to common preparedness questions, with links into the matching calculator.

Embed these tools

Free iframe embeds for the calculators. No API key.

Related runtime tools