Garbage Bag Size Calculator
Stop guessing which trash bags fit. Enter can dimensions and overhang preferences to get precise bag width and length.
Extra length to fold over the rim for a secure fit.
Recommended bag width: 14 inches (flat width)
Recommended bag length: 34 inches
How to Use This Calculator
Measure your bin
Grab a tape measure. Note the width, depth, and height. For round cans, measure the diameter.
Choose your overhang
Decide how much extra bag you want folding over the rim to prevent slips.
Match the bag size
Compare results with bag packaging (width × length). Round up if unsure to avoid tearing.
Formula
Rectangular Bag Width = (Can Width + Can Depth) ÷ 2
Round Bag Width = Circumference ÷ 2 = π × Diameter ÷ 2
Bag Length = Can Height + Overhang + (Can Depth ÷ 2)
Example: 16\u2033 × 12\u2033 × 24\u2033 can, 4\u2033 overhang → Width = 14\u2033 → Length = 24 + 4 + 6 = 34\u2033.
Bag Sizing Tips
- Kitchen cans (13 gallons) usually need ~24\u201d × 27\u201d bags.
- Oversize yard bags should add extra overhang for heavy loads.
- Round cans require measuring diameter—circumference math handles the rest.
- Always size up if you use a bag cinch or tie system.
Frequently Asked Questions
What does bag width mean?
Manufacturers list the flat width of the bag. Multiply by 2 to estimate the circumference it can wrap around.
Should I round up?
Yes. A slightly larger bag prevents tearing and makes tying easier, especially for drawstring styles.
How much overhang should I use?
2\u20136 inches is typical. Heavy-duty cans may benefit from more overhang for strong cinching.
Can I convert to gallons?
Yes—multiply cubic inches by 0.004329. For example, 1,728 in³ ≈ 7.5 gallons.