How to Use Trash Bag Size Calculator
The Trash Bag Size Calculator recommends a trash bag size based on the shape and dimensions of your bin. Choose the bin shape, enter dimensions in cm or inches, and the Trash Bag Size Calculator outputs the recommended bag width and length in both units.
- Pick the bin shape — round, square or rectangle.
- Enter dimensions — diameter for round bins, length × width for square/rectangular bins, plus the bin height.
- Set top fold margin — extra length so the bag can fold over the rim and be tied.
Formula & Theory — Trash Bag Size Calculator
The Trash Bag Size Calculator uses simple geometry to approximate bag size:
Round bin:
bag width ≈ π × diameter / 2
bag length ≈ bin height + diameter / 2 + margin
Square / rectangular bin:
bag width ≈ (length + width) × 2 / 2 = length + width
bag length ≈ bin height + max(length, width) / 2 + margin| Symbol | Meaning |
|---|---|
| Diameter | Bin opening diameter for round bins |
| Length / Width | Bin opening side lengths |
| Height | Bin vertical depth |
| Margin | Extra length for folding and tying |
Assumptions and Limits
The Trash Bag Size Calculator assumes a flat bag laid flat (single-side width). Real packaging measurements may use the half-fold width; check the bag spec sheet.
Use Cases for Trash Bag Size Calculator
- Kitchen bins — typical 20-40 L kitchen bins.
- Bathroom bins — small 5-10 L round bins.
- Office bins — under-desk bins.
- Outdoor / commercial bins — large 60-120 L bins.