A larger diameter hose is able to produce more water volume but it typically does so with reduced water pressure. Therefore it’s important to recognize how the hose will be predominantly used when selecting the diameter.”
If the garden hose will be mostly used for filling buckets, ponds, pools etc, then a larger diameter will typically be best. If the need is for the hose to carry a stronger water jet or will be hooked up to a sprinkler, hose nozzle etc. then a smaller diameter may be preferred in order to maintain higher water pressure.
Here's a breakdown of the most common sizes:
½ inch (1.3 cm): This is appropriate for small lawns and gardens. It's lightweight, easy to maneuver, and delivers sufficient flow for basic watering tasks. However, pressure loss can occur over longer distances.
⅝ inch (1.6 cm): This diameter offers a balance between maneuverability and increased water flow. It is the most common diameter and is ideal for medium-sized lawns and gardens, or when using pressure washers or sprinklers.
¾ inch (1.9 cm): This is the heavyweight champion, providing the highest flow rate. It’s perfect for large properties, fast filling tasks, or situations with low water pressure. However, ¾ inch hoses are also heavier and bulkier to handle. It is generally used by professionals.