The Right Way to Measure Jar Lids

The Right Way to Measure Jar Lids

Measuring jar lids might seem simple, but anyone who has tried to replace a missing or broken lid knows it can quickly become tricky. With different types of closures, varying depths, and inconsistent sizing standards, finding the right lid isn’t always straightforward.

In this guide, we’ll walk you step by step on how to identify the lid type and measure it accurately, so you can always order the correct lid. Whether you’re making homemade preserves, running a small artisan production, or preparing jars for sale, these practical tips will help you choose the right lid without any stress.

Types of Jar Lids

Before measuring, it’s important to know which type of lid your jar uses. The two main options are Twist-Off Lids (Lug) and Pre-Threaded Lids (continuous thread). They are not interchangeable, so identifying them correctly is essential.

Pre-Threaded Lids

Have a smooth, continuous spiral.
Screw fully onto the jar.
Commonly used for honey, sauces, and general preserves.

Twist-Off Lids (Lug)

Feature short “lugs” that catch onto the jar’s corresponding bumps.
Open and close with just a few turns.
Often used for jams, chutneys, and baby food.
Available in three depths: Standard, Deep, Extra Deep.

If You Already Have the Lid

If you already have the lid, measuring it is simple. Turn it upside down and check the widest internal diameter in millimeters. This measurement allows you to quickly identify the correct size by comparing it to common standards. Using this method, you can find the right lid for most Pre-Threaded and Twist-Off lids without guessing.

If the Lid is Missing

Even if the lid is missing, you can still figure out which one you need. Start by measuring the outer diameter of the jar opening, from edge to edge. Add 1–2 millimeters to account for the thickness of the lid. For Twist-Off lids, also measure the depth of the shoulder to decide whether you need a Standard, Deep, or Extra Deep lid. This approach ensures you pick the correct closure even when the original lid is lost.

Tips to Avoid Measurement Mistakes

Always measure in millimeters, not centimeters.
Use a rigid ruler or caliper; flexible tape measures can be inaccurate.
If the lid feels “almost right,” the depth is probably incorrect.
Jars of the same volume (e.g., 200 ml) may use different lids: never assume.
When in doubt, compare with an existing lid that fits another jar.

Additional Tips

For precise measurements of Twist-Off Lids, a digital caliper is ideal.
Record all measurements to easily compare replacements.
When choosing a new lid, consider color and material, especially if the product will be displayed or sold.

Get the Right Lid in One Click

Measuring jar lids correctly helps you avoid errors and ensures a secure seal for your preserves or artisan products. Now that you know how to measure, visit our website to explore the full range of jar lids and find the perfect lid for your jars with just a few clicks—quick, easy, and stress-free.