A 3-month emergency food supply is the benchmark serious preppers aim for — and the level recommended by emergency management agencies for extended disruptions. Getting there requires real math, not guesswork. Here's how to calculate exactly what your family needs.
Step 1: Calculate Daily Calorie Needs
Use these baselines for planning. In an emergency, physical activity often increases, so err toward the higher end:
| Person | Sedentary | Active |
|---|---|---|
| Adult male | 2,000 | 2,500 |
| Adult female | 1,800 | 2,200 |
| Child (6–12) | 1,400 | 1,800 |
| Teen | 2,000 | 2,600 |
Step 2: Calculate Total Calories for 90 Days
Formula: Daily calories per person × number of people × 90 days = Total calories needed
Example — Family of 4 (2 adults + 2 children):
(2,200 + 2,200 + 1,600 + 1,600) × 90 = 682,200 total calories
Step 3: Build Your Supply by Category
Aim for this rough breakdown of your total calories:
- 40% Grains/Carbs (rice, oats, pasta, flour) — cheap, calorie-dense, very long shelf life
- 25% Protein (freeze-dried meat, canned protein, legumes)
- 15% Fats (butter powder, shortening, oil, nuts)
- 20% Fruits, Vegetables, Dairy, Meals
The Easiest Starting Point: Pre-Built 3-Month Kits
If you don't want to build from scratch, start with a complete kit and supplement from there:
👉 3-Month Emergency Food Supply – Complete Kit, Pre-Calculated Calories
👉 30-Day 1-Person Emergency Food Supply – 200 Servings (buy 3 to reach 90 days)
Building from Individual Components
For maximum value and customization, build with bulk components:
👉 Dried Pinto Beans – 311 Servings, Protein + Carbs + Fiber
👉 Dried Black Beans – 237 Servings per Pail
👉 Mountain House Freeze-Dried Beef – 25-Year Shelf Life Protein
👉 Butter Powder – 510 Servings, Critical Fat Source
Don't Forget Water
At 3 gallons per person per day, a family of 4 needs 1,080 gallons for 90 days. Most of this comes from stored and filtered sources rather than pre-packaged water.
👉 Big Berkey Water Filter – Filter Any Water Source for Your 90-Day Plan