TL;DR
To calculate your food storage: list everyone in your household, assign daily calories by age and activity, multiply by storage duration in days, then divide by the caloric density of what you're storing. The math takes ten minutes. What people usually find when they do it: they have far less stored than they thought.
Step-by-Step Calculation
Step 1: List Household Members and Daily Calories
| Person | Age/Sex | Activity | Daily Calories | |--------|---------|----------|----------------| | Example: Adult male | 35, male | Physical labor | 3,200 | | Example: Adult female | 33, female | Moderate | 2,000 | | Example: Child | 8, boy | Moderate | 1,600 | | Total household daily | | | 6,800 |
Use the calorie requirements table article for specific values. In doubt, use 2,000 per adult, 1,400 per child under 12.
Step 2: Calculate Total Storage Duration
Multiply household daily calories × number of days.
| Duration | Formula | Example (6,800 cal/day) | |---------|---------|------------------------| | 72 hours | × 3 | 20,400 calories | | 2 weeks | × 14 | 95,200 calories | | 30 days | × 30 | 204,000 calories | | 90 days | × 90 | 612,000 calories | | 6 months | × 180 | 1,224,000 calories | | 1 year | × 365 | 2,482,000 calories |
Step 3: Convert to Food Quantities
Divide total calories needed by the caloric density of each food type.
Using the example household for 90 days (612,000 total calories):
Allocation suggestion: 50% grains, 25% legumes, 15% fats, 10% other
| Category | Calories Needed | Cal/lb | Pounds to Store | |----------|----------------|--------|----------------| | Grains (rice, oats, pasta) | 306,000 | 1,650 | ~185 lbs | | Legumes (beans, lentils) | 153,000 | 1,540 | ~99 lbs | | Fats/oils | 92,000 | 3,500 | ~26 lbs (~3 gallons) | | Other (canned goods, supplements, etc.) | 61,000 | varies | plan separately |
Pre-Calculated Household Packages
For households that want quick planning numbers.
Family of 2 Adults — 90 Days (2,000 cal/person/day)
- Total calories: 360,000
- White rice: 85 lbs
- Dried beans/lentils: 40 lbs
- Cooking oil: 1.5 gallons
- Oats or other grain: 30 lbs
- Canned goods (protein, vegetables): 80-100 cans
Family of 4 (2 adults + 2 children) — 90 Days
- Estimated daily: ~7,000 calories
- Total calories: 630,000
- White rice: 150 lbs
- Dried beans/lentils: 70 lbs
- Cooking oil: 2.5 gallons
- Oats or other grain: 50 lbs
- Canned goods: 150-200 cans
- Formula/special children's foods: per child's current needs
Single Adult — 30 Days
- Total calories: 60,000
- White rice: 15 lbs
- Dried beans/lentils: 12 lbs
- Cooking oil: 0.5 gallon
- Oats: 8 lbs
- Canned goods: 20-30 cans
What Gets Left Out
Most simple calorie calculations miss:
- Water for cooking (rice, beans, and oats all require water to prepare — factor into your water storage)
- Salt for cooking and preservation
- Vitamins/supplements — multivitamins for the duration
- Special dietary items — infant formula, prescription dietary foods
- Fuel/cooking capability — calories are useless if you can't cook them
- Psychological foods — coffee, tea, comfort snacks, condiments. These matter more than people expect in extended situations.
The 10-Minute Audit
If you want to check your current storage quickly:
- Pull everything out (or count jars and bags in place).
- Estimate calories for each item: cans of beans ~350 cal each; cans of soup ~250-350 cal; 10-lb bag of rice ~16,500 cal.
- Total the calories.
- Divide by your household's daily calorie need.
- The result is how many days of storage you have.
Most families doing this exercise for the first time discover they have 2-7 days of actual storage, not the weeks or months they believed. The audit alone is worth doing.
Sources
Frequently Asked Questions
How does FEMA recommend calculating emergency food supplies?
FEMA recommends a minimum 3-day emergency supply for basic preparedness and up to two weeks for extended emergencies, with 2,000 calories per adult per day as a planning baseline. For serious preparedness, 3-12 months of storage is recommended. FEMA's guidance focuses on ready-to-eat or minimal-preparation foods with a 5-10 year shelf life.
What is the quick rule of thumb for food storage quantities?
For adults: 1 lb of grain (rice, pasta, oats, flour) + 0.5 lb of legumes + 2 tbsp of fat per person per day as a bare minimum. This provides approximately 1,800-2,000 calories. For a family of four for 90 days: 360 lbs of grain, 180 lbs of legumes, and about 7 gallons of cooking oil. These are bare minimums — add protein sources, canned goods, and supplemental foods.
How do you calculate storage needs for special dietary requirements?
For gluten intolerance: replace wheat-based grains with rice, corn, and certified gluten-free oats. For diabetes: reduce refined grains and sugar; increase legumes and lower-glycemic whole grains. For food allergies (tree nuts, soy, dairy): audit every storage item for the allergen. Calculate based on what the person actually eats, not average population guidelines. Medical dietary needs are more critical under stress when medical care may be unavailable.