A Garbage Bag Size Calculator is an online tool that calculates the ideal bag size required based on the dimensions of your trash can. Whether you have a rectangular or a circular bin, the calculator will provide a measurement so you can purchase the right garbage bag without guesswork.
Using the correct size of garbage bag enhances cleanliness by preventing spills and rips, and it ensures the bag holds securely in the bin. It’s not only a matter of practicality but also of hygiene and aesthetics.
Formula of Garbage Bag Size Calculator
For a Rectangular Trash Can
Measure Your Trash Can
Start by measuring the internal dimensions of your trash can: its length (L), width (W), and height (H).
Calculate the Volume
Use the formula:
Volume = L x W x H
This will give you the volume of your trash can in cubic inches or centimeters, depending on your preference of units.
Add a Margin for Overhang
To ensure easy removal of the garbage bag, add a margin for overhang—typically 6 to 12 inches:
Overhang = 6 to 12 inches on each side
Calculate the Final Bag Size
Finally, add the volume and the overhang to get the total size of the bag needed:
Bag Size = Volume of Trash Can + Overhang
For a Circular Trash Can
Measure Your Trash Can
Measure the diameter (D) and the height (H) of your circular trash can.
Calculate the Volume
The volume for a cylinder (your circular trash can) is calculated as:
Volume = π x (D/2)^2 x H
Where π (pi) is approximately 3.14159.
Add a Margin for Overhang
Similarly, add an overhang of 6 to 12 inches around the circumference to facilitate easy bag removal.
Calculate the Final Bag Size
Combine the volume and overhang to determine the bag size required:
Bag Size = Volume of Trash Can + Overhang
Utility Table
Here is a quick reference table for common trash can sizes and the corresponding garbage bag dimensions:
| Trash Can Dimensions (inches) | Recommended Bag Size (gallons) |
|---|---|
| 12 x 12 x 24 | 10-13 gallons |
| 18 x 18 x 30 | 20-30 gallons |
| 24 x 24 x 36 | 30-40 gallons |
| Diameter 15 x 24 | 20-30 gallons |
| Diameter 20 x 30 | 30-45 gallons |
Additionally, use an online converter tool for automatic calculations based on your specific input.
Examples of Garbage Bag Size Calculator
Example for a Rectangular Trash Can
Suppose your trash can measures 20 inches long, 12 inches wide, and 30 inches high. Here’s how you calculate the required bag size:
Volume = 20 x 12 x 30 = 7200 cubic inches
Bag Size = 7200 cubic inches + 12 inch overhang (on each side) = approx. 40 gallons
Example for a Circular Trash Can
For a bin with a diameter of 15 inches and height of 25 inches:
Volume = 3.14159 x (7.5^2) x 25 ≈ 4420 cubic inches
Bag Size = 4420 cubic inches + 12 inch overhang = approx. 30 gallons
Most Common FAQs
A: Try to approximate its dimensions to the nearest rectangular or circular form and follow the guidelines above. If the shape is too irregular, choose a bag slightly larger than you calculate to accommodate variations.
A: Measure from the top edge of the trash can down to where you want the bag to extend. This typically ranges from 6 to 12 inches to allow enough material to grip when removing the full bag.
A: Opt for the next largest size available. It’s better to have a slightly larger bag than one that is too small, as this can prevent bag breakage and spills.