Canning Calculator
Work out how many canning jars a recipe fills, in any size from 4 oz to half-gallon, with the spare jars and canner loads you should plan for.
Canning jar calculation helps you prepare the right number of jars for your recipe.
Formula:
Jars needed = Recipe yield (cups or liters) / Jar capacity
Standard jar sizes (US):
| Jar Size | Volume | Best For |
|---|---|---|
| 4 oz (quarter pint) | 118 mL | Jams, jellies, samples |
| 8 oz (half pint) | 237 mL | Jams, salsas, relishes |
| 12 oz (three-quarter pint) | 355 mL | Syrups, sauces |
| 16 oz (pint) | 473 mL | Fruits, pickles, sauces |
| 24 oz (pint and a half) | 710 mL | Fruits, juices |
| 32 oz (quart) | 946 mL | Vegetables, soups, stocks |
| 64 oz (half gallon) | 1893 mL | Juices (only for specific recipes) |
Half-gallon jars are the exception. The only home-canning processes approved for them are apple juice and grape juice. Everything else in that size is untested, and a jar that wide takes so long for heat to reach the middle that no published time covers it.
Common yields per batch:
- Jam or jelly: 6 to 8 half-pint jars
- Tomato sauce: 7 quarts per bushel of tomatoes
- Pickles: 7 to 9 pints per 4 lbs of cucumbers
- Salsa: 6 pints
Always prepare spare jars. Not because the arithmetic is wrong, but because a jar comes out of the box with a chip on the rim about as often as you would expect, and you find out mid-process when it will not seal. One or two extras, sterilized and warm alongside the others, costs you nothing.
The number this page gives assumes your jars fill level. In practice you leave headspace, so a “pint” of finished product is closer to 15 oz than 16, and a batch that works out to exactly 7 jars will usually give you 7 plus an awkward half. Sterilize a small jar for the remainder and put it in the fridge rather than the canner.
Headspace and processing times are a separate question, and they matter more than jar count. See the canning headspace and processing time calculator for those.
Safety: work from tested recipes, from the USDA Complete Guide, your national extension service, or Ball. Jar count is the harmless part of canning. Processing time is not.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
SuperGlobalCalculator is independently built and maintained. See how we build and verify our calculators.