How to Measure the Diameter of a Garden Hose?

measure the diameter of a garden hose.

A lush green garden is what everyone aspires to achieve. The hose you use to keep your plants and lawn fresh significantly influences the health of your garden. The garden hose diameter dictates the size of it, thereby playing a role in its efficiency and flow.

Are you trying to figure out the diameter of your garden hose? You need to be aware of the size of each of your hose! There is a suitable size of garden hose for you to use for different purposes.

Read on ahead to find out how to measure the diameter of a garden hose.

The Most Common Diameter of Garden Hoses

When selecting a garden hose for your lawn or yard, you need to know its exact diameter. While most hoses will come with a marked diameter, some might not. In such a situation, you will have to measure the diameter by yourself.

Sometimes, even the most experienced gardeners find it somewhat tricky to precisely measure the diameter. Do not let this daunt you, though, since most hoses are either 1/2 inches, 3/4 inches, or 5/8 inches in diameter. Keep in mind that the connectors and their width may not be the same in all cases.

The most commonly found inner diameter of garden hoses are as follows:

  • 3/8-inch hose: 10 mm
  • 1/2-inch hose: 12.5 mm
  • 5/8-inch hose: 15 mm
  • 3/4-inch hose: 19 mm

The inner diameter of a garden hose dictates the flow of water. The sizes in inches reflect the inner diameter. A hose with a smaller diameter will produce lesser gallons of water per minute.

How to Measure the Diameter?

The diameter of a garden hose is a crucial snippet of information you must have on you. The diameter affects the water volume, output, and the distance the water can travel when using the hose. Take a look below to find some of the most convenient ways to measure the diameter of a garden hose.

Look for Markings

Most of the time, garden hoses have markings on them that state the measurement of their diameter. Look at your hose closely and try to search for any such markings.

If you cannot find them, you can approach garden equipment professional. Such experts often have a lot of experience and will tell you the diameter just based on a mere look.

The Simplest Method: Using Dowels

The easiest way to measure the diameter of a garden hose is to use a dowel. Make sure you remove all fittings and accessories before trying this method.

If you have a 3/4-inch dowel, insert it into your hose. If it fits perfectly and sits snugly, then your hose has a diameter of 3/4 inches.

Does the same dowel does not fit into the hose or fits loosely? If yes, you should safely assume that it is either 1/2 inch or 5/8 inches in size. Garden hoses with a diameter or 1/2 inches are rather uncommon as compared to other sizes.

It is understandable if dowels of these sizes are not at your disposal. There are other and more accurate methods.

Using the Outer Diameter

You can also use a garden hose’s outer diameter to get an idea about the inner diameter. Most 5/8-inch garden hoses consist of an inner diameter with a measurement of somewhere between 0.77 inches and 1.00 inches.

When you measure the outer diameter and find it less than 0.77 inches, your hose is most likely a 1/2-inch garden hose. If its measurement turns out to be more than 1 inch, then your garden hose is probably a 3/4-inch hose.

Employing an Index Card

It is perhaps the most complicated way of finding out the diameter of a garden hose. You will have to start by removing any accessories and fittings from the hose. Then, use a rolled-up index card and put it inside the hose.

The index card you use should be in a proper tube shape. It should be at least half within the hose when you insert it. Follow up by taping the card so that it maintains the tube shape when you finally remove it.

Once you have taped the card, remove it from the hose without allowing it to open up. When you have the tube securely in your grasp, measure it with a tape measure or ruler. You must measure the side which you put into the hose.

Why Can’t You Use A Tape Measure?

There are so many different ways to measure the diameter of a garden hose! It must have left you wondering why you cannot just use a measuring tape to get the results you seek. There are various reasons for this: it is not the best way to find the diameter of a hose.

The diameter of the openings of a garden hose is often different than the rest of the hose. The connections on the ends of a garden hose are generally wider and sport a greater diameter than the rest of it. In addition to this, different brands have different sizes of connections, and there is no general uniformity.

You can measure the connection and then subtract its width from the measurement. It will, however, not yield accurate results.


The diameter of a garden hose dictates its suitability for your garden. A smaller diameter means that you will have a lesser flow of water. You need to be aware of the diameter of your garden hose.

You can measure a hose’s diameter using dowels, the outer diameter, or an index card. In this manner, you will be able to find the perfect use for the hoses you already have. It will also help you decide which type of hose to buy next.