Mason Jar Volume Converter
Convert any jar size between ounces, cups, milliliters, and pints in one tap. Know exactly how many jars you need before you start canning, prepping, or shopping.
Jar Size Converter
Common Mason Jar Sizes at a Glance
Every standard canning jar size mapped to the units you actually use in recipes and meal prep.
| Jar Name | Ounces | Cups | Milliliters | Pints |
|---|---|---|---|---|
| Quarter-pint (jelly) | 4 oz | 0.5 | 118 ml | 0.25 |
| Half-pint (standard jelly) | 8 oz | 1 | 237 ml | 0.5 |
| Quilted jelly | 12 oz | 1.5 | 355 ml | 0.75 |
| Pint (wide mouth) | 16 oz | 2 | 473 ml | 1 |
| Pint-and-a-half | 24 oz | 3 | 710 ml | 1.5 |
| Quart (large mouth) | 32 oz | 4 | 946 ml | 2 |
| Half-gallon | 64 oz | 8 | 1893 ml | 4 |
| Gallon | 128 oz | 16 | 3785 ml | 8 |
Heads-up: actual fill capacity is slightly below brim-full. Leave ½ inch headspace for canning.
How Many Jars for Your Batch?
Enter your total recipe volume and pick a jar size. We'll tell you exactly how many jars to grab — plus a spare for good luck.
Why Jar Math Matters
Canning Precision
Recipes often list yields in pints or quarts, but your cupboard holds 12 oz quilted jars. Convert once and never guess headspace again.
Meal Prep Made Easy
When you batch-cook soups, stocks, or overnight oats, knowing jar capacities lets you portion evenly without a measuring cup for every container.
Bulk Shopping Smarts
A gallon of pickles sounds great — but how many quart jars does that actually fill? Do the math before you haul home a flat of jars.