As an expert in culinary and kitchenware, I can tell you that the size of a jelly jar can vary significantly depending on the manufacturer and the specific use intended for the jar. However, there are some common sizes that are widely recognized in the United States:

1. **Half-pint (8 fluid ounces or 236.6 milliliters)**: This is a smaller size, often used for individual servings of jelly or jam.
2. **Pint (16 fluid ounces or 473.2 milliliters)**: A standard size for jelly jars, suitable for a family's use over several days.
3. **Quart (32 fluid ounces or 946.4 milliliters)**: Larger jars are less common for jelly but can be used for canning larger quantities.

It's important to note that these sizes are typically associated with canning jars, which are designed to create a vacuum seal for long-term storage. For decorative or non-canning purposes, you might find a wider variety of sizes and shapes.

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Regular MouthIdeal ForJelly Jars (4 oz)Jams, jellies, mustards, ketchups, dipping sauces, flavored vinegars and small portion sizesJelly Jars (8 oz)Jams, jellies, conserves and preservesJelly Jars (12 oz)Jams, jellies and marmaladesHalf Pint (8 oz)Fruit syrups, chutneys and pizza sauce2 more rowsread more >>