There is no single correct number. How much fuel you need depends on how many people you are feeding, how long you expect the outage to last, and which cooking method you plan to use first. Instead of guessing, this guide walks you through a simple four-step planning process, shows you what to compare between fuel types, and gives you a testing checklist so you find out your real usage before an emergency forces you to find out the hard way.
This article assumes you already know which device you plan to use. If you have not chosen yet, read our full breakdown of rocket stoves, solar ovens, camp stoves, charcoal and wood fires first, then come back here to plan the fuel supply behind whichever method you pick.
The Rule That Comes Before Any Fuel Plan
No fuel-storage plan matters if the cooking itself makes someone sick. Every fuel-burning cooking device — charcoal grills, camp stoves, rocket stoves, and open fires — produces carbon monoxide, a colorless, odorless gas. The Consumer Product Safety Commission is direct about this: these devices must be used outdoors only, and generators specifically should run at least 20 feet from the home with the exhaust pointed away. This applies even with doors and windows open, and even in a garage with the door up.
Battery-backed carbon monoxide alarms on every level of your home are part of a fuel plan, not an optional extra. For a full walkthrough of CO symptoms, ventilation, and which appliances are actually safe indoors, see our companion guide on cooking during a power outage and carbon monoxide safety.
Step 1: Set a Duration Goal
Before you buy or store anything, decide what you are planning for. A three-day outage after a storm and a multi-week grid failure call for very different fuel quantities. Most household emergency plans start with a 72-hour target and then scale up in stages. Write your target down — it is the number every other decision in this worksheet depends on.
Step 2: Pick a Primary Method and a Backup
A layered cooking capability means you are not stuck if one fuel source runs out or one method fails in bad weather. A common pairing is a fuel-efficient primary method for daily cooking plus a simple backup that needs little skill. Examples of layering:
- Solar oven as primary, propane camp stove as backup — solar works free and is safe near a window or on a balcony with sun exposure, but it does nothing on cloudy days or at night, which is what the backup covers.
- Rocket stove as primary, charcoal as backup — both need outdoor space and ventilation, but a rocket stove burns small scrap wood efficiently while charcoal gives you a familiar backup if wood is wet or unavailable.
- Propane camp stove as primary, open wood fire as backup — propane is fast and simple, but a wood fire is the fallback if you run out of canisters and have access to a woodlot or scrap lumber.
Whatever pairing you choose, both methods still fall under the outdoor-only rule above. There is no combination of fuel-burning devices that becomes safe to use indoors.
Step 3: Run a Test Before You Need It
The most reliable way to know how much fuel you actually need is to test it under real conditions, not estimate from a chart. Fuel use varies with weather, altitude, pot size, food type, and how experienced you are with the equipment.
- Pick a calm daylight weekend and cook one full meal outdoors with your primary method, exactly as you would in an outage.
- Note how much fuel that meal used — canisters consumed, wood gathered, or charcoal burned.
- Multiply that per-meal usage by the number of meals in your duration goal from Step 1, and add a margin for cold or windy conditions, which increase fuel use.
- Repeat the test with your backup method so you have real numbers for both, not just your primary.
- Log the results somewhere your household can find them, along with the date, so you can retest as equipment or household size changes.
This is the single best way to avoid both under-buying fuel and overspending on more than you will use.
Step 4: Store the Fuel Safely and Rotate What Needs Rotating
Once you know roughly how much fuel you need, storage becomes a safety question as much as a planning one. Fuel storage carries its own fire and code risks that are separate from cooking risks. For container types, safe quantities, and where fuel can and cannot legally be kept at home, see our dedicated guide to emergency fuel storage safety for gasoline, propane and kerosene. General storage differences worth planning around:
- Propane canisters — do not spoil or go bad in the way food does, but the canisters themselves need dry, temperature-stable storage away from heat sources. Check canisters periodically for rust or damage.
- Charcoal — stays usable indefinitely if kept fully dry; the main enemy is moisture, so store it in a sealed container, not the original paper bag, in a garage or shed.
- Firewood or scrap wood — needs airflow and cover from rain, not an airtight seal, or it will hold moisture and burn poorly. Rotate older wood to the front so it gets used first.
- Kerosene or liquid fuels — have the shortest practical shelf life of the group and the strictest storage rules. Treat these as a rotate-and-replace item, and confirm your local fire code limits before storing large quantities.
Match your storage location to your household’s space: an apartment or condo plan looks very different from a rural property with a shed and a woodlot. If you are still building out your broader off-grid setup, our off-grid living beginner’s guide covers how cooking fuel fits into a wider power and water plan.
Your Grid-Down Cooking Fuel Worksheet
Use this as a simple checklist to turn the steps above into an actual plan:
- Duration goal set (number of days): ___
- Household size to feed: ___
- Primary cooking method chosen: ___
- Backup cooking method chosen: ___
- Test cook completed for primary method, fuel used logged: yes / no
- Test cook completed for backup method, fuel used logged: yes / no
- Fuel quantity on hand vs. target for duration goal: ___
- Storage location confirmed safe and outdoors or code-compliant: yes / no
- CO alarms installed and battery-checked: yes / no
- Rotation date set for wood, kerosene, or other perishable fuel: ___
Keeping Food Safe While You Are Managing Fuel
Fuel planning solves how you cook, not whether the food you are cooking is still safe to eat. According to FoodSafety.gov, a full refrigerator keeps food safely cold for about 4 hours once the power goes out if the door stays closed, and a full freezer holds safe temperatures for about 48 hours (24 hours if half full). Food exposed to 40°F or above for more than 2 hours should be discarded, and taste or smell should never be used to judge safety. When you are unsure, the standard guidance is simple: when in doubt, throw it out. Our refrigerator and freezer food safety during a power outage guide covers this in full, including what to do with each category of food after the power returns.
Who Needs Extra Caution
Carbon monoxide poisoning is more dangerous for infants, older adults, and anyone with a heart or breathing condition, so these households should lean harder on no-cook, no-fuel meal options during an outage rather than pushing fuel-burning equipment closer to livable space to save time. On the food-safety side, FoodSafety.gov also flags that pregnant people, young children, older adults, and people with weakened immune systems face higher risk from foodborne illness, which makes the “when in doubt, throw it out” rule even more important for those households.
What This Guide Does Not Cover
This worksheet gives you a planning process, not fixed fuel-quantity numbers, because actual usage varies by household, climate, equipment, and cooking habits — which is why the test-cook step matters more than any chart. It also does not cover generator sizing or electrical backup power; for that, see our emergency generator comparison. This is general preparedness education, not fire code, insurance, or engineering advice — check your local fire code and any homeowner or renter restrictions before storing fuel in larger quantities.
Frequently Asked Questions
Do I need to store fuel for every cooking method I own?
No. Storing fuel for a primary method and one backup method is generally enough for most households. Storing fuel for every method you own adds cost and storage risk without adding much real redundancy.
How do I know if I am storing too much fuel?
If your stored quantity is well beyond your duration goal from Step 1, or beyond what your local fire code allows for home storage, you are likely storing more than you need. Check container limits in our fuel storage safety guide linked above.
Can I skip the test cook and just estimate from an online chart?
You can, but a chart cannot account for your specific stove, pot size, altitude, or typical weather. A short real-world test gives you numbers you can actually trust for your household.
What should I do first if I have not started a fuel plan at all?
Start with Step 1: pick a duration goal. Everything else in this worksheet — method choice, testing, storage, and rotation — builds from that one number.
This article is for general educational purposes and does not replace guidance from FoodSafety.gov, the Consumer Product Safety Commission, your local fire department, or a qualified professional. Always follow current local fire codes and manufacturer instructions for any fuel or cooking equipment.