How Big Is a #5 Nursery Pot? | Sizes Beyond the Label

A #5 nursery pot holds roughly 3.5 to 5.4 gallons, not an exact 5.00 gallons.

When you grab a #5 nursery pot, you might assume it holds exactly 5 gallons of soil. The reality is that this container size is a trade designation, not a precise measurement. Plant growers and garden centers use the “#5” label loosely, so actual capacity varies noticeably between brands and pot styles. For anything from repotting a shrub to planning container spacing, you need the specifics behind the label.

What The #5 Container Size Really Means

A #5 nursery pot is generally a trade-size 5 container, but it is not guaranteed to hold exactly 5 US gallons. Many vendors classify pots by their nominal trade size rather than their true liquid volume, which is why you will find the same “#5” label on pots with noticeably different specs.

Here is what the dimensions actually look like across common #5 styles:

• Heavy-duty nursery pot: 11.25 inches wide x 11.25 inches tall
• Trade No. 5 pot: 11.875 inches diameter x 10.125 inches height, listed at 3.58 gallons
• 5 gallon nursery pot: 12.22 inches diameter x 11.63 inches height, listed at 4.02 gallons

Nature Hills Nursery explains that container sizes are not standardized, and the same trade number can correspond to different shapes and volumes depending on the manufacturer.

How Much Soil Does A #5 Pot Actually Hold?

The measured volume range for a #5 pot is wider than most people expect. One nursery container chart from Texas Master Gardeners places the #5 size between 3.4 and 5.4 gallons, depending on the product style. Typical 5-gallon pots often measure 11 to 12 inches in top diameter and 12 to 14 inches in height, but those measurements do not translate into a consistent fill capacity because the pots taper toward the bottom.

When you buy a container labeled “5 gallon” at a garden center, the actual capacity can be closer to 3.5 or 4.0 gallons. This matters most when you are mixing potting soil. If a plant’s care instructions call for a certain volume of mix, base your estimate on the measured spec from the manufacturer rather than the name on the pot.

For a smoother buying experience, our roundup of the best 5 gallon nursery pot options gives you models with the exact specs you need before you order.

What Is The Difference Between Pot Diameter And Volume?

Nursery pots are tapered, which means the top diameter, bottom diameter, and height are not interchangeable measurements. The top opening tells you the surface area of the soil, while the height combined with the taper determines the actual volume. A pot with a wider top but a shallow depth can hold less soil than a taller, narrower pot of the same trade size.

For plant spacing and shelving, rely on the stated dimensions from the specific manufacturer. A #5 pot from one brand may sit noticeably different on a shelf than a #5 from another, even if both are described with the same trade number.

The Growers Goods spec sheet for the AP Polycan 5 Deep Round lists the pot at 11.875 inches in diameter and 10.125 inches in height, with a listed capacity of 3.58 gallons.

If you are transporting plants or planning how many containers fit on a cart, the Nature Hills guide to container sizes reinforces that the trade number alone is not enough for planning purposes.

So when someone asks how big a #5 nursery pot is, the honest answer is that it sits in the 3.5 to 5-gallon range depending on the specific product. Check the manufacturer’s stated dimensions and measured volume before you commit to a planter, a soil order, or a shelf layout.