Quick Answer

Wondering what size trash bag do I need? The right size depends on your trash can’s dimensions and capacity. Most kitchen trash cans use 13-gallon trash bags (24″ × 33″), bathroom bins use 4–8 gallon bags, and outdoor containers typically require 30–39 gallon bags. To choose the correct size, measure your trash can’s height, width, and circumference, then compare them with a trash bag size chart.

At Hemcbags, we manufacture millions of trash bags annually for distributors and waste-management companies across North America and Europe. This guide is based on real-world specifications and industry sizing practices.

Standard Trash Bag Sizes Explained

Standard trash bag sizes are typically categorized by gallon capacity and bag dimensions. The most common sizes range from 4-gallon bathroom liners to 55-gallon industrial bags.

These are the most common standard trash bag sizes used in homes, offices, restaurants, and commercial facilities.

What Is the Standard Kitchen Trash Bag Size?

The standard kitchen trash bag size is 13 gallons. Most residential kitchen trash cans sold by brands such as Simplehuman, Rubbermaid, Sterilite, and Glad are designed for 13-gallon liners.

• Typical dimensions: 24 inches × 33 inches
• Capacity: 13 gallons (49 liters)
• Recommended thickness: 0.9–1.2 mil for everyday household waste.

Among all kitchen trash bag sizes, the 13-gallon bag remains the most widely used option in North America.

Garbage Bag Sizes vs Trash Bag Sizes

There is no difference between garbage bag sizes and trash bag sizes. In the United States, the terms are used interchangeably.

Common garbage bag sizes include:

• 4 gallon
• 8 gallon
• 13 gallon (most common for kitchens)
• 20 gallon
• 30 gallon
• 39 gallon
• 55 gallon

These garbage bag sizes cover most residential, commercial, and industrial applications.

Whether you search for garbage bag sizes or trash bag sizes, both refer to the same sizing system based on gallon capacity and bag dimensions.

Trash Bag Sizes by Trash Can Brand

Trash Bag Sizes by Bin Location

The most common household trash bag size is 13 gallons, which fits standard kitchen trash cans. So if you are wondering what size trash bag do you need for your kitchen, start with 13 gallons.

But here is a quick cheat sheet for the most common bins:

But wait — gallon size alone does not guarantee a perfect fit. The shape of your can matters just as much. A tall, slim kitchen can needs a different bag than a short, wide one, even if both hold 13 gallons.

Understanding Standard Trash Bag Sizes and Dimensions

Always check garbage bag dimensions, not just gallons. Standard trash bag size varies by brand. A “13-gallon” bag from one manufacturer may have different width and height than another.

Trash Bag Sizes Chart

Looking for a trash bag size chart? Here is a simple table to help you find the right bag fast.

How to Determine What Size Trash Bag Do I Need for Different Bins?

If you do not see your bin in the chart above, or if you have an unusually shaped can, measure your trash can using the methods below. This takes less than two minutes.

Step 1: Look for a Label First

Many modern trash cans have the gallon capacity printed on them. Check the bottom of the can or the inside rim. If you see a number followed by “gal” or “gallon” — that is your answer. Buy bags that match that number.

Step 2: Measure Your Can’s Dimensions

No label? No problem. Grab a tape measure.

You need two measurements:

• Height (H): Measure from the inside bottom of the can to the top rim.
• Width (W): For round cans, measure the diameter (straight across the opening). For square or rectangular cans, measure the length of one side.

Step 3: Use the Formula to Find Your Bag Size

For round cans:

First, calculate the bag width you need:

• Bag Width = (Diameter × 3.14) ÷ 2

Then, calculate the bag length:

• Bag Length = Can Height + 4 to 6 inches (for overhang to tie or secure the bag)

Example: A round can with a 16-inch diameter needs a bag width of (16 × 3.14) ÷ 2 = about 25 inches. If the can is 24 inches tall, you need a bag that is at least 28–30 inches long.

For rectangular or square cans:

• Bag Width = Length of one side + Width of the other side

Example: If your rectangular can opening is 14 inches long and 10 inches wide, calculate: 14″ + 10″ = 24 inches. Look for a bag with a width close to 24 inches.

Once you have your width and length numbers, compare them to the size chart above. The bag’s dimensions (not just its gallon rating) will tell you if it fits.

Why “13 Gallons” Does Not Always Mean the Same Size

Here is something that confuses almost everyone.

Two bags can both say “13 gallons” on the box but have completely different dimensions. That is because “13 gallons” refers to volume capacity, not physical size. Manufacturers adjust the height and width to create different fits for different can shapes.

If you own a Simplehuman or a Rubbermaid bin, you might find that generic 13-gallon bags either slide off or are impossible to stretch over the rim. For these specific models, always aim for a kitchen trash bag size that offers at least 2 inches of overhang.

Always check the width and height on the box, not just the gallon number. A “Tall Kitchen” bag is significantly different from a “Standard” bag, even though both are labeled “13-gallon”. This is exactly why you should always check the bag’s width and height, not just the gallon number, when deciding what size trash bag you need.

Bag Types and Seal Styles

Beyond size, trash bags come in different seal styles. Each has a different job.

If you deal with wet trash or food scraps, choose a starseal bag. If you want quick, easy cleanup without struggling to tie knots, drawstring bags are the way to go.

The Starseal is considered the gold standard for heavy-duty use. By folding the bottom of the bag into a star shape, manufacturers eliminate gaps where leaks usually start, allowing the bag to conform perfectly to any bin shape.

Trash Bag Thickness: How Strong Do You Need?

Thickness is measured in mils (1 mil = 0.001 inches) or microns. Here is a simple guide:

A standard kitchen trash bag is typically 0.9 to 1.1 mil thick. If you regularly throw away heavy or sharp items (cans, bones, broken glass), go thicker. A thicker bag costs more upfront but saves you from messy leaks and double-bagging.

Frequently Asked Questions

Final Thoughts

Choosing the right trash bag sizes comes down to two things: your bin’s gallon capacity and its physical dimensions.

• Bathroom wastebasket → 4–8 gallons
• Standard kitchen can → 13 gallons
• Large kitchen or utility bin → 20–30 gallons
• Garage or yard waste → 30–39 gallons

But here’s what most people miss: gallon size alone isn’t enough. A 13-gallon bag from one brand may fit your kitchen can perfectly, while another brand’s “13 gallon” bag doesn’t. Always check the width and height on the box against your bin’s measurements.

That’s the real standard trash bag size rule: fit over function.

Pro Tip for Bulk Buyers:
Sourcing wholesale 13 gallon trash bags directly from a manufacturer ensures consistent dimensions and cost savings. Use our garbage bag sizes chart to streamline your procurement.

Now you know exactly what size trash bag you need — and how to measure for a perfect fit every time.

About the Author

Chris
Founder of Hemcbags

Chris has over 10 years of experience manufacturing and exporting compostable and traditional trash bags to distributors, wholesalers, municipalities, and waste-management companies across North America and Europe.

Continue reading:

• Biodegradable vs Compostable – what’s the real difference?
• Best Compostable Trash Bags – expert-tested picks for 2026