GUIDE
How many days will your food last?
Updated: July 2026 · All guides
“How long could we eat from home?” is the core of pantry runway planning. The answer is never exact — but a reasonable estimate beats guessing. You need three inputs: what you have, how many people you feed, and how intensely you would ration in a disruption.
The basic idea
Days of food ≈ total usable calories in the home ÷ daily calories needed.
Example: two adults at ~2,000 kcal/day need ~4,000 kcal/day together. If your counted pantry holds ~28,000 kcal of food you would actually eat, that is roughly 7 days — before considering water, vitamins, or variety.
What counts as “in stock”
Include:
- Dry goods, tins, jars, snacks in the cupboard
- Freezer meals (if power is reliable or you have backup)
- Long-life milk, oils, nut butters — easy to forget but calorie-dense
Exclude or discount:
- Condiments used by the teaspoon unless you are truly rationing
- Food others in the house cannot eat (allergies, diet)
- Items past safe use-by dates
Beyond calories
Days-of-food math is a model. Real life adds stress, picky eaters, and no coffee. Build buffer into your target — if you want 3 days of security, stock toward 4–5 days of calories. Pair food with a 3-day water plan and basic hygiene supplies.
Manual math vs. tracking apps
You can sum calories in a spreadsheet once. Keeping it current is harder. Apps like Stokl focus on reserve tracking: add items, quantities, and expiry; the app estimates how many days supplies might last based on your household settings. It is guidance, not a guarantee — same as any calculator — but it updates when you finish a tin of beans or add a bag of rice.
Improve your runway over time
- Complete a home inventory first.
- Set a target (e.g. 3 days, then 1 week).
- Shop to fill gaps, not duplicate what you already own.
- Re-check monthly; eat and replace oldest stock.