How Many Ounces Are Mason Jars? A Complete Size Guide

Mason jars hold 4, 8, 12, 16, 24, 32, or 64 fluid ounces in standard sizes, with the pint and quart being the most common.

Whether you’re canning salsa, storing dry goods, or making overnight oats, the ounce capacity of your mason jar determines how much it actually holds. The size you need depends entirely on what you plan to put inside. Here’s the full breakdown of standard mason jar sizes and the best use for each.

Standard Mason Jar Sizes: From Jelly to Juice

Mason jars come in a reliable range of capacities, and the names match the US customary measurement system. The sizes below cover what you’ll find on most store shelves.

• 4 oz — quarter pint or jelly jar, ideal for small samples, spices, or single servings of jam.
• 8 oz — half pint, the classic jar for jams, jellies, conserves, chutneys, and pizza sauce.
• 12 oz — three-quarter pint, commonly used for jams, jellies, and marmalades.
• 16 oz — pint, the go-to size for salsas, sauces, relishes, and pie fillings.
• 24 oz — pint and a half, suited for asparagus, pickles, sauces, soups, and stews.
• 32 oz — quart, a favorite for fruit and vegetable slices, pickles, tomatoes, and whole or halved produce.
• 64 oz — half gallon, primarily used for apple and grape juices.

A 128 oz gallon jar occasionally appears in size charts, but it’s far less common in everyday canning and storage. Stick with the range from 4 oz to 64 oz and you’ll cover nearly every practical need.

Mason Jar Dimensions and Mouth Styles

Capacity isn’t the only difference between jars. Height and opening size vary too, which matters when you’re checking shelf clearance or choosing lids.

Approximate heights by capacity (varies slightly by brand): 4 oz jars run about 2.25–2.5 inches tall; 8 oz jars about 3.75–4 inches; 12 oz jars about 4.5–5.25 inches; 16 oz jars about 4.8–5.2 inches; 24 oz jars about 6–6.8 inches; 32 oz jars about 6.75–7 inches; and 64 oz jars about 9.1–10 inches tall.

Mouth style is the other key distinction. Regular-mouth jars have an opening around 2⅜–2.5 inches, while wide-mouth jars open to roughly 3 inches. Wide-mouth jars make filling and cleaning easier, and they accept larger canning accessories. Regular-mouth jars take up less shelf space and use standard lids that cost a bit less.

Ounces Versus Cups: What a Jar Really Holds

The ounce number stamped on a mason jar means fluid ounces of capacity — it has nothing to do with the jar’s weight. If your recipe calls for cups, the conversion is straightforward.

Whether you’re portioning leftovers or scaling a canning recipe, these equivalents mean you never have to guess. Ball’s official jar-selection guidance recommends the 8 oz through 64 oz range for canning and matches each size to specific foods.

Freezer Safety and Choosing the Right Size

Not every mason jar is safe for every job. Ball’s jar-selection guide labels some jars as freezer safe, but that only holds if you leave proper headspace and follow the product instructions. Fill a jar to the rim and freeze it, and the contents will expand and crack the glass.

Likewise, canning safety depends on matching the jar to the method. A 64 oz jar works beautifully for juice, but it’s not the right vessel for every preserve. Smaller jars process more evenly in a water bath, which is why jams and jellies typically go into 8 oz or 12 oz jars while pickles and whole fruits fill pints and quarts.

If you’re stocking up for canning season, the classic approach is to keep a mix: 8 oz jars for jams and sauces, 16 oz jars for salsas and relishes, and 32 oz jars for pickles and tomatoes. That covers most home canning projects without wasting shelf space. If you’re looking to buy 12 oz jars specifically, our tested roundup of the best 12 oz mason jars breaks down the top options.