Free Garbage Bag Size Calculator

The Garbage Bag Size Calculator helps you determine the ideal liner dimensions for any trash can, saving you from guesswork and ill‑fitting bags. Whether you need a trash can liner size for a circular kitchen bin or a rectangular office container, this tool calculates both bag width and height based on your can’s shape and measurements. It also serves as a trash bag size chart by providing a reference to standard garbage bag sizes so you can compare computed results with commercially available options.

How to Use the Calculator

Using the tool involves three simple choices:

1. Shape of your trash can – Select from Circle, Square, or Rectangle.
2. Overhang (tie length) – This is the extra bag material that folds over the rim. The recommended overhang is typically between 3 and 6 inches (7–15 cm). A default of 4 inches is preset.
3. Trash can dimensions – Enter the appropriate measurements:
   • For a circle: diameter and height.
   • For a rectangle: length, width, and height.
   • For a square: width (same as length) and height.

After entering the values, the calculator instantly displays the recommended bag width and bag height.

Example

Suppose you have a circular trash can with a diameter of 22 inches and a height of 30 inches, and you want a 4‑inch overhang. After selecting Circle and entering these values, the tool returns a bag width of approximately 35 inches and a bag height of 45 inches.

Manual Calculation Formulas

If you need to compute the size yourself, use the following formulas.

For Rectangular and Square Cans

Bag width:

$$G_{w} = T_{l} + T_{w}$$

Bag height:

$$G_{h} = T_{h} + G_{o} + \frac{G_{w}}{4}$$

Where:

• $G_{w}$ = bag width
• $G_{h}$ = bag height
• $T_{l}$ = trash can length
• $T_{w}$ = trash can width
• $T_{h}$ = trash can height
• $G_{o}$ = overhang (bag height above rim)

The term $\frac{G_{w}}{4}$ ensures the bag fully covers the bottom of the can.

For Circular Cans

Bag width:

$$G_{w} = T_{d} \times \frac{\pi}{2}$$

Bag height:

$$G_{h} = T_{h} + G_{o} + \frac{T_{d}}{2}$$

Where $T_{d}$ is the diameter of the trash can.

Worked Example

Repeat the earlier example with the formula: for a circular can with $T_{d}=22$ in, $T_{h}=30$ in, and $G_{o}=4$ in:

$$G_{w} = 22 \times \frac{\pi}{2} \approx 34.56 \text{ in} \rightarrow 35 \text{ in}$$ $$G_{h} = 30 + 4 + \frac{22}{2} = 45 \text{ in}$$

So a 35×45 inch bag is a perfect fit.

For a different scenario, consider a square kitchen can with both length and width of 20 inches and a height of 36 inches, using an overhang of 6 inches:

$$G_{w} = 20 + 20 = 40 \text{ in}$$ $$G_{h} = 36 + 6 + \frac{40}{4} = 52 \text{ in}$$

Thus, a 40×52 inch bag is appropriate.

Standard Garbage Bag Sizes

Commercially available bags are grouped by size category. The following table lists common garbage bag dimensions for reference.

Category	Common Sizes (Width × Height in inches)
Small	9×12, 13×16, 16×18, 17×20, 19×25
Medium	20×22, 22×20, 24×22, 24×24, 26×36, 28×40, 30×38, 35×47
Large	36×50, 40×46, 40×50, 42×48, 43×48, 50×48, 50×60, 61×68

These sizes cover most household, office, and industrial needs.

Choosing the Right Thickness

Besides dimensions, bag thickness (measured in mil) matters for durability. A mil equals 0.001 inches. For everyday kitchen waste, low‑density bags of 0.5–0.9 mil are economical and sufficient. For renovation debris, broken glass, or sharp objects, heavier bags of 2.0–3.0 mil provide the needed puncture resistance.

Most garbage bags are single‑use plastics, so choosing the correct size not only improves functionality but also reduces material waste. A well‑fitted bag minimizes overhang waste and prevents the need for double‑bagging.