Harvest to Canning Calculator

Raw pack fills jars with unheated produce, which is less dense and leaves more air pockets — so you typically get fewer jars per pound. Hot pack pre-cooks the produce, causing it to shrink and pack more tightly, which means you can fit more into each jar. This calculator applies a density factor of 0.85 for hot pack versus 1.0 for raw pack to account for this difference.

It depends on the produce type. As a general guideline, tomatoes (whole) need about 2.5–3 lbs per quart, green beans need about 1.5–2 lbs, corn kernels need about 1–1.5 lbs, and cucumbers need about 1.5–2 lbs per quart. These estimates vary with produce size, ripeness, and pack style.

Most water-bath and pressure-canned recipes call for roughly 1/2 to 1 cup of liquid per pint jar, and 1 to 2 cups per quart jar. Pickles use brine, tomatoes may use tomato juice or water, and green beans typically use salted water. Always leave the correct headspace (usually 1/4 to 1/2 inch) after adding liquid.

Headspace is the empty space left between the top of the food/liquid and the lid of the jar. It's critical because it allows food to expand during processing and helps form a proper vacuum seal. Too little headspace can cause food to bubble up and prevent sealing; too much can leave excess air that shortens shelf life. Most canning guides recommend 1/4 inch for jams/jellies and 1/2 inch for most vegetables and fruits.

It can be, especially when you grow your own produce or buy in bulk at harvest time. The savings depend on produce cost, jar and lid prices, energy costs, and your time. This calculator's cost-per-jar output helps you compare your home canning cost directly against store prices so you can make an informed decision.

Standard weights vary by crop. A bushel of tomatoes is about 53 lbs, green beans about 30 lbs, corn (in husks) about 35 lbs, and cucumbers about 48 lbs. A peck is one quarter of a bushel. This calculator automatically converts bushels and pecks to pounds using these standard weights before estimating jar counts.

Yes — the jar and produce estimates apply to both methods. The difference between pressure canning and water-bath canning is the processing method and safety requirements (low-acid foods like green beans must be pressure canned), not the amount of produce needed to fill a jar. Always follow USDA-approved recipes for safe processing times.

Enter your desired jar count in the 'Target Number of Jars' field. The calculator will show you exactly how many pounds of produce you need to reach that target based on your selected produce type, jar size, and pack style — useful for planning your garden planting quantities.