How much water do dehydrated meals need?

Most dehydrated camping meals need 300-500ml of boiling water per serving. The typical ratio is 1:2 (1 part dry food to 2 parts water by weight). Always check the packet instructions as ratios vary. Under-hydrating leaves crunchy, unpleasant food. Over-hydrating gives soup.

How much weight do dehydrated meals save?

Dehydrated food weighs 60-70% less than its fresh equivalent. A meal that rehydrates to 400g weighs only 120-150g dry. Over a week-long trip, this can save 3-5kg of pack weight compared to carrying fresh or tinned food.

Are dehydrated meals nutritious?

Freeze-dried meals retain most nutrients from the original food — typically 90-95% of vitamins and minerals. Standard dehydrated meals (not freeze-dried) retain slightly less but are still nutritious. They are a good source of carbohydrates and protein. Supplement with fresh fruit, nuts, and vitamins on longer trips.

How long do dehydrated meals take to prepare?

Most dehydrated camping meals need 8-12 minutes of soaking time after adding boiling water. Boiling water takes 3-5 minutes on a typical stove. Total preparation time is roughly 15 minutes. Cold soaking (without cooking) takes 30-60 minutes and saves fuel.

CampCalcs

Dehydrated Food Calculator

Calculate water needed to rehydrate meals and total food weight savings.

Dry Weight per Packet

Weight measurement

Servings per Packet

Number of servings

Water Ratio

Parts water per part dry food

Trip Days

Number of days

Dehydrated Meals per Day

Rate value for this calculation

How We Calculate This

Rehydration Calculation

Water needed = Dry weight x Water ratio

Rehydrated weight = Dry weight + Water needed

Trip Planning

Total dry weight = Packets needed x Dry weight per packet

Calories estimated at ~4.5 kcal/g of dry weight.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify conditions and use proper safety equipment outdoors.