Third Rack vs Tall Tub: Which Adds More Usable Capacity?

What each feature does

A third rack is a slim, flat rack positioned at the top of the tub, above the upper rack. It is designed for long utensils, spatulas, measuring cups, and small bowls that would otherwise take up space in the upper or lower rack. By moving those items into their own tier, the third rack frees the main racks for plates, bowls, and cookware. See how it works in detail in our explainer on the third rack.

A tall tub refers to a dishwasher body that is taller than a standard or low-profile interior, often by a few inches. The extra height increases the vertical clearance inside the tub, which affects the usable space in the lower rack. A lower rack in a tall tub can accommodate taller items such as stockpots, tall stemware, and large mixing bowls without tilting or blocking the spray arm. The concept is explained further in our article on tall tub dishwashers.

How a third rack adds usable capacity

The third rack adds capacity by creating a new loading plane in a part of the tub that otherwise goes unused. In most designs, the space above the upper rack is too shallow for plates or bowls but deep enough for flat utensils, lids, and small items. Without the third rack, those items must go in the silverware basket in the lower rack, which consumes a significant footprint. A silverware basket with a removable lid, for instance, occupies part of the lower rack that could otherwise hold plates or bowls.

When a dishwasher has a third rack, loading patterns change. Long utensils and spatulas lay flat, which also improves cleaning because water and detergent reach every surface without nesting. Small lids, baby bottle parts, and measuring spoons can be spread out on the third rack instead of being stacked together in a basket. This reduces the chance of water or detergent being blocked, and it frees the silverware basket to be removed entirely for tall items in the lower rack.

The trade-off is that the third rack takes up some vertical space from the upper rack in some designs, though most modern models compensate by keeping the upper rack adjustable or by designing the third rack with a low profile. For households that load the dishwasher once a day with plates, bowls, and flatware, the third rack typically adds more usable capacity than a tall tub alone, because it addresses the most common loading bottleneck: where to put the utensils.

How a tall tub adds usable capacity

A tall tub increases the interior height of the dishwasher, which directly affects what fits in the lower rack. In a standard-height tub, the lower rack may limit tall items because the upper rack, when in its lowest position, reduces clearance. A tall tub often adds several inches of vertical space, allowing the lower rack to hold a stockpot upright, a tall pitcher, or a large mixing bowl. This matters most for households that cook in bulk, host gatherings, or use large bakeware.

The added height can also improve how the upper rack is used. With a tall tub, the upper rack might be positioned higher, which then gives more room below for tall cups or stemware. Some tall tub models also combine with an adjustable upper rack, so you can raise the upper rack to create extra clearance in the lower rack, or lower it to fit taller items above. The combination of a tall tub and rack height adjustment creates the most versatile loading interior.

For a standard household with typical dinnerware, a tall tub may not be necessary. Its benefit is situational. For a household that regularly loads large skillets, Dutch ovens, or tall glasses, the tall tub is the feature that prevents those items from having to be washed by hand or placed at an angle that blocks water from reaching other dishes. The extra vertical space is most valuable when you load the lower rack with items that exceed the height of a standard tub.

Spatial comparison: what each adds to the tub

The table below summarizes how a third rack and a tall tub change the usable interior of a dishwasher, highlighting where the space is added and what types of items benefit most.

Which adds more usable capacity for most homes?

For most households, the third rack adds more usable capacity in everyday terms. The reason is that the typical load includes a high proportion of flat items: plates, bowls, glasses, and utensils. The third rack takes the utensils out of the lower rack, which means the entire footprint of the silverware basket becomes available for plates or cookware. That shift can add several place settings of capacity without changing the tub height.

A tall tub adds capacity mainly for tall items. If your household rarely loads tall items, that extra vertical clearance goes unused on most cycles. If you do load large pots or tall cups, the tall tub is the difference between fitting them upright and having to hand wash them. In that case, the tall tub adds more usable capacity for your specific loads.

The best answer for most buyers is to look for a dishwasher that offers both. Many full-size built-in models include a third rack and a tall tub design. With both, you get the flat tier for utensils and the vertical clearance for large cookware, and the two features complement each other. See our picks for 24-inch built-in dishwashers and models with 9 or more place settings.

Place settings versus real-world capacity

Manufacturers rate dishwasher capacity in place settings, but the standard definition does not capture the flexibility that a third rack or tall tub adds. The ENERGY STAR program defines standard-capacity models as holding more than eight place settings and six serving pieces, and compact models as holding fewer. That measure is based on a standardized load of plates, bowls, glasses, and flatware, not on the variety of real cookware that people actually load.

Two dishwashers with the same rated place settings can feel very different in daily use. One with a third rack and adjustable upper rack will handle a family's mixed load more easily than a model with the same rating but a fixed upper rack and no third rack. One with a tall tub will handle bulky cookware that the other cannot. When comparing capacity, it is more useful to think about how the interior is laid out than to rely on the place setting number alone. Our guide to place settings and usable capacity explains this in more depth.

For compact and 18-inch models, the trade-off is different. A compact tub is shorter and narrower, so a third rack may not fit, and a tall tub may not add as much benefit because the width is the limiting factor. In those models, the priority is usually a well-designed lower rack with adjustable elements. See our selection of 18-inch built-ins and compact dishwashers.

How to evaluate which feature to prioritize

Start by looking at what you wash most often. If most of your loads are everyday plates, bowls, and flatware, the third rack is the higher-value feature. It removes the cutlery basket from the lower rack, which is the single biggest footprint that competes with plates and cookware. Compare models with and without a third rack in our third rack versus no third rack comparison.

If your loads frequently include large cookware, tall drinkware, or baking sheets, measure the height of those items and compare it to the interior height of models you are considering. A tall tub matters when an item barely does not fit in a standard tub. Look for the tub height in the spec sheet, and see how the lower rack sits relative to the spray arm and the upper rack in its lowest position. Our guide on standard dishwasher dimensions can help.

Finally, consider whether the model lets you adjust the upper rack. An adjustable upper rack combined with either feature gives you more control over the interior space than a fixed rack. If you are choosing between two models and one has a third rack plus an adjustable upper rack, and the other has only a tall tub, the first is usually the more flexible choice for everyday use. See how adjustable racks affect capacity for more.

What to pick for your loading needs

Questions

Does a third rack reduce the space in the upper rack?

In some designs, the third rack occupies vertical space above the upper rack, which can reduce how tall the upper rack can be. Many modern models compensate by making the upper rack adjustable or by designing the third rack with a very low profile. For most users, the added flatware space in the third rack is worth more than the small reduction in upper rack height.

Can a tall tub hold more place settings than a standard tub?

Not necessarily. Place settings are based on a standardized loading pattern of plates, bowls, glasses, and flatware. A tall tub adds vertical clearance, but it does not increase the footprint of the racks. The main benefit is fitting taller items, not fitting more standard dinnerware.

Which is better for a household of two people?

For a household of two, the third rack is usually the better choice. It lets you load utensils and small items in the top tier, so you can run smaller loads without filling the lower rack with a cutlery basket. A tall tub is still useful if you cook with large pots, but the third rack addresses the more common everyday load.

Are there dishwashers that have both a third rack and a tall tub?

Yes. Many full-size built-in dishwashers combine a third rack with a taller interior. This combination gives you the flat tier for utensils and the vertical clearance for large cookware. When comparing models, check whether the third rack is removable or whether the upper rack is adjustable, since that affects the overall flexibility.

Does the third rack or tall tub affect energy or water use?

Neither feature directly changes the water or energy consumption of a cycle. The ENERGY STAR criteria for dishwashers are based on energy and water use per cycle, not on interior layout. Loading the dishwasher efficiently, scraping rather than rinsing, and running full loads are the main factors that affect resource use. See the ENERGY STAR guidance on loading and scraping for more.