We often hear from folks who have some bottles and jars, but need some new lids in order to re-use or re-purpose them. “How do I know what size lid will fit” is the question we get asked. Sometimes, it’s the opposite…a customer inherits a large number of lids, but doesn’t have the jars to go with them. So, whether you’re looking to cover some jars, or looking for jars to cover, we can help!
Measurements are almost always in millimeters (mm). Don’t have a metric ruler? You can use a standard ruler or tape measure and convert to metrics.
If you don’t have a tool designed for this purpose, you can place some masking tape or some card stock to serve as a straight edge to take out the guess work.
Here are some pictorial guidelines on the proper way to measure jar finishes.
CAUTION…while we like to encourage responsible re-use of jars, we cannot recommend that you use jars of an unknown standard in your canning process. Many jars are not designed to withstand the pressure canner process and you may end up with product loss or suffer personal injury. Some may not even be able to withstand water bath. Please remember to keep the limits of your jars and/or lids in mind as you use them and re-use them.