How to Measure Zipper Size

Before you order the FixnZip®, you should determine your zipper sizes. Watch the video below to see zipper sizing and where you can locate zipper sizes; in addition, you can check out our size chart below to determine how to measure zipper sizes.

Chances are that you have come to this page because you have a broken zipper that needs replacing. By now, you have probably also realized that zippers come in different sizes, and it is important to know what size you need to continue your replacement process. FixnZip is here to make it easy to not only order your zipper replacement parts but also to know exactly what size you need. We help you learn what zipper is best for every scenario, and you’ll be a zipper pro in no time. Allow us to help you learn how to measure zipper sizes, so you can understand how to tell what size zipper you need.

To determine the replacement zipper slider size you need, start by checking the back of your broken zipper slider. Most zippers have a size number (1-10) embossed on the back of the slider. Once you locate the number, our zipper sizing chart below will determine which FixnZip® replacement zipper slider size is right for you.

Small:  Sizes 1-4
Examples: pants, skirts, fine garments, cushions, clutch handbags

Medium: Sizes 5-7
Examples: jacketssleeping bagstents, purses, duffel bags, golf bags

Large: Sizes 8-10
Examples: wetsuitsboat covers, canvas tents, heavy duty clothing, jeep windows

How To Measure Zipper Size

If your zipper doesn’t have a number on the back, you can simply measure the width of the zipper teeth in millimeters or inches. Once you’ve determined your zipper sizing, you can decide which zipper slider within the small, medium, and large categories will best fit your needs.


Teeth/Coil Width
1 to 4.5 mm  |  0.04 to 0.18 in = Small
5 to 7.5 mm  |  0.19 to 0.30 in = Medium
8 to 10 mm  |  0.31 to 0.40 in = Large

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