What Are Bottle Cap Sizes? Complete Guide

The dimensions of a bottle cap refer to its size and shape, which can vary depending on the type of bottle and its intended purpose. The standard dimensions of bottle caps are typically defined by industry standards and specifications and are designed to fit specific types of bottles. Understanding the dimensions of a bottle cap is important for manufacturers, consumers, and packaging professionals alike, as it affects the compatibility and functionality of the bottle and its cap.

Bottle caps come in different sizes, but the most common one is about 30mm on the outside and 28mm on the inside, with a small space between them of 4mm. The height is also about 5.5mm. These measurements are important to make sure the cap fits the bottle correctly and protects what’s inside.

In this guide, we’re going to learn all about bottle cap sizes! You’ll find out the common dimensions, the different types of caps used on popular products, and lots of other interesting information.

Bottle Cap Sizes

There are lots of different sizes of bottle caps out there, and you can find them in many different places. One company called Midwest Bottles has 15 different sizes to choose from!

Common Bottle Cap Sizes

Bottle cap sizes are typically measured in millimeters (mm) and are denoted by a two-digit number that represents the inner diameter of the cap. Some of the common bottle cap sizes include:

  • 24mm
  • 28mm
  • 38mm
  • 48mm
  • 53mm
  • 63mm

These sizes are used for various types of bottles, including those used for carbonated beverages, water, juice, sauces, oils, and pharmaceuticals.

Basic Understanding of Bottle Cap Sizes

The fit of the bottle cap is all about the size of the bottleneck. If the cap fits snuggly around the neck, then you’re good to go. But if it doesn’t, then you’ll need to find a different cap that fits better. That’s why when we talk about bottle cap sizes, we always consider the finish of the bottleneck.

When it comes to bottle cap sizes, you might see numbers like 28-410. This is a common way to express the size of a bottle cap. The first number, 28, tells you the inside size of the cap or the outside size of the bottle’s neck. The second number, 410, tells you the way the threads are on the bottleneck according to GPI standards.

Related: Standard Water Bottle Sizes 

How To Measure Neck Finish?

Measuring the neck finish of a bottle involves determining the diameter and thread style of the bottleneck. There are 5 important factors to consider about the neck finish of the bottle. To ensure that you choose the perfect cap for your bottle, you’ll need to know all of these details. Here’s a rundown of the variables you need to keep in mind.

  • I-Dimension: This is the measurement of the diameter of the bottleneck’s opening.
  • T-Dimension: This refers to the outer diameter of the bottleneck’s threads.
  • S-Dimension: This is the distance from the top of the bottleneck to the topmost thread.
  • E-Dimension: This is the gap between the inside of the bottle cap and the outside of the neck’s threads.
  • H-Dimension: This is the height of the bottleneck.

A Variety of Bottle Caps

There are several types of bottle caps, each designed for specific needs and uses. Here are some of the most common types:

Screw Caps:

Screw caps are widely used for sealing various types of bottles, including water bottles, soda bottles, and many types of beverage containers. They consist of a threaded plastic or metal cap that can be twisted onto the bottle neck, creating a secure seal.

Crown Caps:

Crown caps, also known as bottle caps or bottle crowns, are typically used for sealing glass bottles, such as those used for beer and carbonated beverages. They have a distinct shape with a crimped edge and a central disk that is pressed onto the bottle neck to create an airtight seal. Crown caps often require a bottle opener to remove them.


Corks have been used for centuries as a traditional method of sealing wine bottles. They are made from the bark of cork oak trees and are compressed into the bottle neck, creating a tight seal. Corks are often associated with higher-quality wines and can provide an airtight barrier, allowing wines to age properly.

Plastic Snap Caps:

Plastic snap caps are commonly used for sealing bottles containing liquids like milk, juice, or sports drinks. They are made of plastic and have a tab or lip that can be pulled or pushed to open or close the bottle. These caps create a tight seal and are easily reusable.

Twist-off Caps:

Twist-off caps are commonly found on jars and bottles containing preserves, sauces, and other food products. They consist of a metal cap with threads that match the bottle’s neck. To open, you simply twist the cap counterclockwise until it comes off. Twist-off caps provide a secure seal and are often used for products that require long-term storage.

Flip-Top Caps:

Flip-top caps, also known as swing-top caps or bale wire caps, are commonly used for sealing glass bottles of beverages like beer, cider, and some carbonated drinks. They have a hinged metal or plastic closure that flips up to open the bottle and snaps back down to create a tight seal.

Press-on Caps:

Press-on caps are frequently used for sealing bottles of cosmetics, pharmaceuticals, and other liquid products. These caps are made of plastic and are pressed onto the bottle neck, creating a secure seal. Some press-on caps may have tamper-evident features, such as a breakable seal or a tear strip, to indicate if the bottle has been opened.

Related: What Are the Bottle Opener Dimensions?

Dropper Caps: 

These are similar to sprayer caps, but they feature a dropper tip instead of a spray nozzle. They’re often used for products like essential oils, tinctures, and other liquids that are meant to be dispensed in small drops.

Sports Bottle Cap

A sports bottle cap is a type of bottle cap that is designed specifically for sports bottles, also known as water bottles. This type of cap is usually made of plastic and has a flip-up spout or straw, making it easy to drink from while you’re on the go. This type of cap is popular among athletes and people who are active as it allows them to drink without having to take the bottle out of its holder or open the cap completely.

Lidded Bottle Cap

A lidded bottle cap is a type of cap that has a plastic plug and a metal clasp. To close the bottle, you push the plastic plug into the neck and then use the metal clasp to secure it. This type of cap is commonly used for glass water bottles.


How are bottle cap sizes measured?

Bottle cap sizes are typically measured using two numbers that represent the diameter and thread count of the cap. The diameter is measured in millimeters (mm) and refers to the distance across the inside of the cap. The thread count indicates the number of threads per inch on the cap.

Are there different size bottle caps?

Yes, there are different sizes of bottle caps available. The sizes can vary depending on the specific type of bottle or container being used. Common bottle cap sizes include 18mm, 20mm, 24mm, 28mm, and 38mm, among others.

What is the meaning of 24 410 caps?

In the format “24 410,” the number 24 refers to the diameter of the bottle cap in millimeters, and 410 indicates the thread count per inch. So a “24 410” cap has a 24mm diameter and 410 threads per inch.

What size is a 2-liter cap?

The size of a 2-liter bottle cap can vary, but it is commonly found in the larger cap sizes such as 28mm or 38mm. The specific size may depend on the brand or manufacturer of the bottle.

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