Freeze Dry Math

Meals and starches

How to freeze-dry soup

Broth-based soups and stews freeze-dry into just-add-water meals. Cut pieces small, skim fat, and freeze the trays solid before loading.

Creamy pumpkin soup with parsley and bread
Soups and stews. Photo: Elena Leya on Unsplash
Batch card · Soups and stewsGood
VerdictWorks with the right prep.
PrepBroth-based, small pieces, pre-freeze
Typical cycle26–36 h
Water contentabout 88%
1 lb fresh becomes2.0 oz dried
Eat straight from the bag?No: cook or rehydrate

Soup is mostly water, which makes it a long cycle and a light bag. It is also one of the most rewarding meals to have dried: a few ounces of chunks and powder become a bowl of homemade soup in ten minutes.

Broth-based soups with small pieces of vegetables, beans, pasta or chicken work best. Cream soups are higher in fat and keep less long.

Prep and loading

  1. Make soup with pieces no larger than ½ inch.
  2. Chill and skim fat.
  3. Ladle ½ inch deep into lined trays and freeze them solid before loading. Liquid soup will spill.
  4. Weigh portions before drying and write the fresh weight on each bag.

How to tell it’s done

  • The sheet is dry and crumbly; vegetable and meat pieces are hard.

Not sure? The weight check compares two weighings and the expected dry weight for soup.

Problems and fixes

Soup spilled into the chamber

It was not frozen solid. Always pre-freeze liquid trays.

Noodles turned mushy

Cook noodles separately al dente and add them dried.

Rehydrating and storing

Rehydrate: Boiling water to the original weight, cover 10 minutes. By weight, 100 g of dried soup takes back about 708 g of water to return to fresh weight; the rehydration calculator does any amount.

Store: Mylar with oxygen absorbers, one or two servings per bag.

Ways to use it

  • Quick lunches
  • Backpacking and hunting trips
  • Sick-day meals

How much fits per batch

At a normal single layer, soup load at roughly 2.6 lb of fresh food per square foot of tray. That works out to:

MachineFresh per batchDried per batch
Harvest Right Countertop 3606.5 lb12.8 oz
Harvest Right Small7.8 lb15.5 oz
Harvest Right Medium12.2 lb1.51 lb
Harvest Right Large20.0 lb2.47 lb
Harvest Right X-Large40.6 lb5.03 lb

Sources

  1. USDA FoodData Central: soup, vegetable beef, prepared with equal volume water (water content)
  2. Utah State University Extension: Can I Freeze-Dry That? (2026)
  3. Penn State Extension: Let’s Preserve: Freeze-Drying
  4. Iowa State University Extension AnswerLine: Preserving by home freeze drying

Water content rounded from USDA FoodData Central (soup, vegetable beef, prepared with equal volume water). Cycle times are typical ranges at default settings; thickness, load and your room change them. How we put these together.