Mason Jar Sizes and Uses: A Practical Guide to the Eight Common Formats

Walk into any kitchen store and you face a wall of Ball and Kerr mason jars in eight common sizes, two mouth diameters, multiple lid types, and dozens of style variants. Most home canners and storage users only need three or four formats, but choosing the right ones depends on what you preserve, whether you freeze, and how much shelf real estate you have. This guide walks through the eight sizes that cover 95 percent of home use, when wide mouth beats regular mouth, headspace rules by content type, and a short list of formats worth keeping versus the ones that mostly sit empty.

The eight common sizes

Ball and Kerr (both made by Newell Brands since 1996) sell jars in these sizes:

4 oz (quarter pint): the jelly and condiment jar. Used for jam, hot sauce, mustard, herb butters, spice blends. Wide mouth and regular mouth both available. Wide mouth is preferred for jam because it spreads easier from a wide opening.

8 oz (half pint): the most versatile small jar. Used for jam, jelly, salsa, chutney, sauces, vinaigrettes, individual servings of yogurt or overnight oats, single-portion freezer meals. Both mouth types common.

12 oz (regular mouth only, often sold as “jelly jar”): the in-between size for gifting preserves. Less common in shelf-stable canning recipes because processing times are calculated for standard sizes.

16 oz (pint): the workhorse for pickles, relishes, salsas, pasta sauce, half-cup servings of soup, dried beans, granola, nuts, coffee beans, dry pantry storage. Both mouth types common. Wide mouth is the better default.

24 oz (pint and a half, only in select shapes): less common, often used for asparagus and tall vegetables that do not fit comfortably in a pint.

32 oz (quart): the canning standard for whole tomatoes, peaches, pears, applesauce, dill pickles, pickled okra, soups, broths, juice. Both mouth types. Wide mouth is dominant in pickle aisles.

64 oz (half gallon): wide mouth only. Used for juice (apple, grape, tomato), iced tea, dry storage of flour or sugar, fermenting (with airlock lids), pickle barrels. Too large for most pressure-canned foods because of heat penetration concerns; the USDA approves half gallon only for grape and apple juice.

Gallon (128 oz): not technically a mason jar in most ranges; sold as a wide-mouth glass storage jar without canning approval. Used for dry pantry storage, fermenting big batches of sauerkraut or kombucha, and bulk liquid storage in the fridge.

Wide mouth vs regular mouth, the practical difference

The opening diameter:

• Regular mouth: 2.375 inches (about 6 cm)
• Wide mouth: 3 inches (about 7.6 cm)

The wide mouth advantages:

• Easier to fill without a funnel
• Easier to clean by hand or with a bottle brush
• Easier to fit whole pickles, peach halves, chicken thighs, large garlic cloves
• Required for half gallon jars (only made in wide mouth)
• Better for freezing because straight-sided variants exist

The regular mouth advantages:

• Lids are slightly cheaper (about 20 percent less per dozen)
• Available in more decorative variants for gift jars
• The shoulder shape works better for shaking dressings without spilling
• Some recipes specifically call for regular mouth pint jars (mostly older recipes)

For a new household: buy wide mouth as the default. Buy regular mouth only for specific recipes or for freezing liquids in pint or half pint jars (which need straight-sided shapes).

Headspace, the rule that prevents most canning failures

Headspace is the empty space between the top of the food and the bottom of the jar lid. Wrong headspace is the single most common cause of canning failure.

Headspace by food type:

Jams, jellies, fruit syrups, marmalades: 1/4 inch Fruits in syrup or juice, applesauce, pickles, salsas, tomato products: 1/2 inch Beans, peas, corn, mixed vegetables (pressure canned): 1 inch Meats, poultry, fish, soups, stews: 1 inch Pumpkin, squash, sweet potato cubes: 1 inch Anything going in the freezer (liquids): 1 to 1.5 inches

Why it matters: too little headspace means food expands during processing, pushes out under the lid, breaks the seal, or leaves residue that prevents sealing. Too much headspace means insufficient vacuum forms, the seal fails or weakens, and the jar may unseal during storage.

A headspace tool (a plastic stick with notched gauges) costs $5 and removes the guesswork. The two-piece lid plus headspace tool plus jar lifter plus magnetic wand is the four-piece accessory set worth buying as a starter pack.

The freezer rule

Most mason jars have a shoulder where the straight wall curves inward at the top. Liquid expanding upward during freezing hits the shoulder, has nowhere to go, and cracks the glass at the stress point.

Straight-sided jars (no shoulder, walls go straight up to the rim) are safe for freezing liquids. Ball labels these explicitly with a “freezer safe” mark.

Available straight-sided sizes:

• 4 oz wide mouth (jelly format)
• 8 oz wide mouth (half pint)
• 16 oz wide mouth (pint)
• 24 oz wide mouth (in select shapes)

Not freezer safe (have shoulders):

• Quart and half gallon jars in any mouth type
• Regular mouth pints and half pints

The workaround for freezing soup or stock: use wide mouth pint jars, leave 1 to 1.5 inches headspace, freeze the jar upright with the lid loose for 24 hours, then tighten the lid once frozen.

Lid types, the four common variants

Two-piece canning lid: the flat sealing disc plus the threaded rim band. Single use for canning (the disc), reusable for storage. The default for home canning.

One-piece storage lid (plastic): screw-on plastic cap for dry storage and refrigerator items. Reusable indefinitely. Not for canning.

Plastic storage cap with pour spout: useful for dressings, oils, kombucha.

Fermentation lid: a one-piece lid with an airlock for lacto-fermentation. Used for sauerkraut, kimchi, pickles. Allows CO2 out without letting oxygen in.

Sourdough starter lid: a plastic cap with a small pinhole, allows gas exchange without exposing the starter to dust.

For a starter inventory, two-piece canning lids cover canning needs, plastic storage lids cover everyday refrigerator use, and a fermentation lid set ($15 for a pack of 4) covers any fermenting projects.

A starter inventory that covers most homes

For a household preserving 6 to 12 batches a year:

• 12 wide mouth pint jars (16 oz)
• 12 wide mouth half pint jars (8 oz)
• 12 wide mouth quart jars (32 oz)
• 6 regular mouth half pint jars (for gifts or recipes that specify)
• 1 box of replacement canning lids (24 wide mouth, 12 regular mouth)
• 4 plastic storage lids in each mouth size

Total cost in 2026: roughly $80 to $100 at retail (Walmart, Target, Tractor Supply tend to undercut Amazon for jars). Buy from Costco in spring for the cheapest case pricing if a membership is available.

The half gallon jars and 4 oz jelly jars are nice to have but rarely essential. Buy them only when a specific recipe needs them.

For more on the canning process itself, see our methodology page on how we evaluate kitchen and preservation gear.

Frequently asked questions