A freeze dryer batch calculator estimates the dry weight, water removed, batch time, shelf life, and electricity cost for a freeze dryer run. Whether you are just starting out or optimizing production, these estimates help you plan batches and calculate per-serving costs.
Batch Settings
US average ~$0.16/kWh. Check your utility bill for your rate.
Batch Estimate
All estimates are approximations. Actual results vary by food moisture content, slice thickness, and machine condition. Always use oxygen absorbers in final storage containers for maximum shelf life.
How to Use the Freeze Dryer Batch Calculator
Freeze drying is the gold standard for long-term food preservation, but each batch is a significant time and electricity investment. Our freeze dryer batch calculator helps you estimate yield, cycle time, and cost before loading the machine.
Step 1: Select your food type
Choose the food category that best matches what you are freeze drying. Each category has different water content percentages — fruits and vegetables are 80-95% water, raw meat is about 60-70%, cooked grains around 60%, and dairy varies. This determines how much weight is lost and how long the cycle takes.
Step 2: Enter fresh weight
Weigh your food before loading trays and enter the fresh (wet) weight. Toggle between lbs and kg. A medium Harvest Right machine can typically handle 7-10 lbs of fresh food per tray for dense items, less for porous or layered foods.
Step 3: Choose machine size
Select your freeze dryer model. The machine size affects electricity consumption (larger machines use more power) and the total capacity per batch. If you are processing more food than fits in one batch, the calculator assumes a single batch.
Step 4: Set your electricity rate
Enter your local electricity rate per kilowatt-hour (kWh). You can find this on your utility bill. The US average is around $0.16/kWh, but rates vary widely from $0.10/kWh (cheap hydro states) to $0.30/kWh (Hawaii, California). European rates are often $0.25-0.40/kWh.
Storage best practices
After the cycle completes, pack freeze dried food immediately into mylar bags or sealed cans with oxygen absorbers. Work quickly — freeze dried food reabsorbs moisture within minutes of exposure to air. One 300cc oxygen absorber per quart is standard; use multiple absorbers for larger containers. Label with date and food contents.
FAQ
Is this freeze dryer calculator really free?
Yes, completely free with no account required. All calculations happen in your browser — no data is sent to any server.
How long does freeze drying take?
A typical freeze drying cycle takes 24-40 hours depending on food type, water content, and batch size. High-moisture foods like fruits and raw meats take longer. Dry foods like cooked rice or crackers can finish in 20-24 hours. Dairy and eggs typically take 30-36 hours.
How much water is removed during freeze drying?
Freeze drying removes 95-99% of moisture content. Fresh fruits and vegetables lose the most weight (they are 80-95% water). Meats lose about 60-75% of their fresh weight. Cooked meals lose 60-80% depending on ingredients.
How long does freeze dried food last?
Properly freeze dried food stored in airtight containers (mylar bags with oxygen absorbers, or sealed cans) can last 25-30 years for many foods. Dairy and eggs last 15-20 years. This compares to dehydrated food at 1-5 years and canned food at 2-5 years.
What is the electricity cost to run a freeze dryer?
Freeze dryers are significant electricity users — a medium Harvest Right model uses about 10-15 kWh per batch. At the US average of $0.16/kWh, that's $1.60-$2.40 per batch. The actual cost depends on your local electricity rate and batch duration.
What foods cannot be freeze dried?
Foods high in fat, oil, or sugar do not freeze dry well. Pure honey, peanut butter, butter, and very high-fat meats (like bacon) freeze dry poorly or rancidify quickly. Alcohol-containing foods also do not freeze dry. Most other foods freeze dry excellently.
How many trays can I load per batch?
Small Harvest Right machines hold 4 trays, medium holds 5 trays, and large holds 6 trays. Commercial units vary. Each tray holds about 4-7 lbs of food fresh weight depending on food density. Do not overload trays — food should be in a single layer or thin pile.
Do I need oxygen absorbers with freeze dried food?
Yes. Oxygen absorbers are essential for long-term storage. Even with near-zero moisture, oxygen causes oxidation that degrades flavor and nutrition over time. Use 300cc oxygen absorbers per quart-sized mylar bag, or 2000cc for a gallon bag. Seal within minutes of opening.