Canning Jar Size & Volume Conversion (US Pints, Quarts to ml, fl oz)
A guide to common US canning jar sizes and their approximate liquid volume capacities in milliliters (ml) and US fluid ounces (fl oz).
Common Jar Name/Size
US Liquid Volume
US Fluid Ounces (fl oz) (approx.)
Milliliters (ml) (approx.)
4 oz Jar (Quarter-Pint)
1/2 US Cup
4 fl oz
118-120 ml
8 oz Jar (Half-Pint)
1 US Cup
8 fl oz
237-240 ml
12 oz Jar (Jelly Jar)
1 1/2 US Cups
12 fl oz
355 ml
16 oz Jar (Pint)
2 US Cups (1 US Pint)
16 fl oz
473 ml (often rounded to 475-480 ml)
24 oz Jar (Pint and a Half)
3 US Cups
24 fl oz
710 ml
32 oz Jar (Quart)
4 US Cups (1 US Quart)
32 fl oz
946 ml (often rounded to 950 ml)
64 oz Jar (Half Gallon)
8 US Cups (1/2 US Gallon)
64 fl oz
1893 ml (often rounded to 1.9 L)
Important Considerations for Canning Jar Volumes:
The volumes listed are the approximate total liquid capacity of the jar.
**Headspace:** When canning, you must leave a specific amount of empty space (headspace) at the top of the jar. This varies by recipe (e.g., 1/4 inch for jams, 1/2 inch for fruits, 1 inch for low-acid foods). The fill volume will be less than the total jar capacity.
Jar manufacturers (e.g., Ball®, Kerr®, Mason) produce jars in these standard US customary sizes.
Metric equivalents for jar sizes in other countries may differ (e.g., 250ml, 500ml, 750ml, 1 Liter jars are common).
Always use jars specifically designed for canning and follow tested canning recipes and procedures for safety.