Food Preservation Timeline Calculator
Plan your harvest preservation schedule. Estimate canning days, freezing batches, and dehydrating sessions based on garden size and equipment.
About this calculator
This calculator turns your garden size and preservation equipment into a rough day-count for putting up a harvest. It assumes a garden yields about 0.6 pounds of produce per square foot, then splits the preservation workload across three methods based on the equipment you have on hand — not on how much of the harvest actually needs each method. Canning capacity comes from your jar count: at roughly 7 quart jars per canner batch and about 3 batches per full working day, the calculator estimates canning days directly from jars available. Freezing assumes about 35 pounds of capacity per cubic foot of freezer space and about 20 pounds processed per blanch-and-bag session to get a batch count.
Dehydrating assumes a fixed 15% of your total harvest gets dried, at roughly 1 pound of fresh produce per tray per 8-hour cycle, to estimate both drying days and batches. Total processing days simply adds canning days, a quarter-scaled contribution from freezing batches, and dehydrating days together — it's a rough scheduling estimate, not a precise labor calendar. One limitation worth knowing: the Family Size input is collected but doesn't factor into any of the underlying math, so changing it won't shift your canning, freezing, or dehydrating estimates; it's there for your own planning reference only, along with the fixed 12-month average shelf life the calculator reports regardless of preservation method, even though canned goods typically outlast frozen or dried ones.
Inputs
Results
Canning Days
6 days
Total Processing Days
33 days
How to Use This Calculator
- Enter Garden Sq Ft to estimate total harvest volume and the corresponding preservation workload.
- Input Canning Jars Available and Freezer Cu Ft to match preservation methods to available equipment.
- Enter Dehydrator Trays and Family Size — larger families consume more and benefit from larger batches.
- Review Canning Days to plan water-bath and pressure canning sessions around peak harvest weeks.
- Check Freezing Batches and Dehydrating Batches to schedule processing across the fall preservation season.
- Use Total Processing Days and Average Shelf Life to build a preservation calendar and pantry inventory plan.
How the result changes with Canning Jars Available
| Canning Jars Available | Canning Days | Total Processing Days |
|---|---|---|
| 60 | 3 days | 30 days |
| 90 | 5 days | 32 days |
| 180 | 9 days | 36 days |
| 300 | 15 days | 42 days |
What each input means
- Garden Size
- Total productive garden area.
- Canning Jars Available
- Number of quart-size canning jars you have.
- Freezer Capacity
- Chest or upright freezer cubic feet available for produce.
- Dehydrator Trays
- Number of trays in your food dehydrator.
- Family Size
- Number of people to feed from preserved stores.
What each result means
- Canning Days
- Full days needed for water bath and pressure canning.
- Freezing Batches
- Number of blanching and freezing sessions.
- Dehydrating Batches
- Number of dehydrator loads to run.
- Total Processing Days
- Total working days for all preservation.
- Average Shelf Life
- Typical shelf life of properly preserved food.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersGarden Size = 2000, Canning Jars Available = 120, Freezer Capacity = 15, Dehydrator Trays = 9 = 5 input(s) provided
- Calculate Canning DaysCanning Days6 = 6
- Calculate Total Processing DaysTotal Processing Days33 = 33
- Calculate Freezing BatchesFreezing Batches27 = 27
- Calculate Dehydrating BatchesDehydrating Batches = max(020 = 20
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why does raising my Family Size input not change any of the results?
Family Size is collected on the form but isn't wired into the canning, freezing, or dehydrating formulas — every processing estimate is driven purely by your garden size and the equipment inputs (jars, freezer cubic feet, dehydrator trays). It's included for your own reference when planning how much preserved food you'll need, not as a multiplier in the math.
Why does only 15% of my harvest get counted toward dehydrating?
The calculator assumes that most home preservers rely on canning and freezing as their primary methods and use dehydrating for a smaller supplemental portion of the harvest — herbs, fruit leather, jerky-style vegetables, and similar items. That fixed 15% share, divided by your tray count, is what produces the Dehydrating Days and Dehydrating Batches figures.
How is Total Processing Days actually built from the three methods?
It adds Canning Days directly, plus Freezing Batches scaled down by a factor of 4 (since freezing sessions are quicker than canning batches), plus Dehydrating Days. Because canning and dehydrating both use jars or trays that limit how many sessions fit in a day, while freezing batches get compressed into a smaller day-equivalent, the three methods don't contribute to the total in the same proportion as their raw batch counts.
Why is Average Shelf Life always shown as 12 months no matter what I enter?
The calculator returns a fixed 12-month figure regardless of which preservation methods you're actually using, even though real shelf lives vary — canned goods commonly last 12-24 months, frozen produce 6-12 months, and dried produce 6-12 months. Treat the displayed number as a rough single-value placeholder rather than a method-specific estimate.
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