How Big Is a 20 Gallon Trash Can? | Real Dimensions

A 20-gallon trash can typically stands 20–30 inches tall, but its exact size depends on shape and design.

Wondering how big a 20 gallon trash can is usually comes down to one question: will it fit in your space? The honest answer is that capacity alone doesn’t determine physical size. A round galvanized utility bin and a slim kitchen step can both hold 20 gallons, yet they take up very different footprints. In U.S. listings, these cans cluster around 23–31 inches tall and roughly 16–22 inches wide, but the shape varies enough to matter.

Here’s what real product dimensions look like and how to measure your space before you buy.

Typical Dimensions by Can Shape

Round cans are usually described by diameter and height, while rectangular ones use width, depth, and height. That difference explains why two “20-gallon” cans can look so unlike each other.

• Round galvanized steel: The Behrens 20-gallon utility can measures 19.5 inches across the top and 25 inches tall. Another galvanized option at Home Depot runs 17.5 x 17.5 x 23 inches.
• Round commercial plastic: The Rubbermaid Commercial BRUTE 20-gallon vented outdoor can is 23.7 inches tall, 22.4 inches wide, and 19.4 inches deep.
• Rectangular slim kitchen: The Hefty 20-gallon step can stands 25.6 inches tall with a 15.4-inch width and 21-inch depth. The SONGMICS version is taller at 28.1 inches but narrower at 16.3 inches wide.
• Plastic utility: A Global Industrial 20-gallon yellow can at Walmart measures 22 x 19.3 x 22.8 inches.

As you can see, a 20-gallon can might fit neatly under a counter or dominate a garage corner. Always check the model’s exact dimensions rather than assuming a standard footprint.

How to Measure a Trash Can Properly

Retailer guidance suggests three quick measurements so you know exactly what fits your space. Start with height from base to rim, then measure the widest point for round cans or both width and depth for rectangular ones.

One detail people miss: manufacturers sometimes measure outside the can, sometimes inside. Behrens notes its 20-gallon dimensions come from outside the can, which means the usable interior is slightly smaller. The SONGMICS listing even provides both — a 19.5 x 16.3 x 28.1-inch product size with an inner bucket of 18.3 x 12.3 x 25.7 inches.

For tight spots, know that slim-profile cans still run tall. The Glad stainless step can is 29 inches high and only 16 inches deep, so it saves floor space but needs vertical clearance.

What Size Bag Fits a 20-Gallon Can?

Don’t buy liners by gallon number alone. Plasticplace’s bag-sizing guide maps 20-gallon wheeled cans to 40–45 gallon bags, while Tenaquip lists 20-gallon BRUTE bags at 30 x 38 inches. The shape, height, and how much liner you want overhanging the rim all change the bag size you need.

Measure the can’s opening and height, then compare those numbers to bag dimensions rather than trusting the label. A 20-gallon can often swallows a larger liner easily.

If you’re still comparing models and want to see tested options side by side, our roundup of the best 20-gallon garbage cans breaks down dimensions, materials, and real-world performance.

Finally, consider where the can will live. Outdoor and commercial models like the Rubbermaid BRUTE are vented and built for restaurants, warehouses, and patios. Steel options from Behrens’ 20-gallon galvanized steel can handle indoor or outdoor use. If you’re shopping for a tight under-counter spot, most 20-gallon models simply won’t fit — you’ll likely need a slimmer, shorter design or a smaller capacity.