Storage bin sizes are not standardized, so a shelf that fits one "medium" tote might fit three of another brand's. This calculator uses real measurements of common tote sizes to show how many bins fit your garage shelf, closet shelf, pantry shelf, or under-bed space, instead of making you guess from a listing photo.
Table of Contents
Why bin sizes are so inconsistent
Quart and gallon capacity numbers describe volume, not footprint. Two totes can both be "40 quarts" and still have different widths, depths, and heights, because one brand goes wider and shorter while another goes narrower and taller. That is why a bin labeled the right capacity can still be the wrong shape for your shelf.
This calculator sidesteps that problem by using actual exterior dimensions for five common tote sizes. It then checks both orientations (bin turned one way, then the other) against the space you enter. That way it finds the arrangement that fits the most bins rather than assuming one layout. Knowing the real storage bin size before you shop, rather than trusting the quart number on the label, saves a return trip when the tote that fit the picture does not fit the shelf.
Standard storage bin size reference
| Size | Capacity | Dimensions (L x W x H) |
|---|---|---|
| Small tote | 12 qt | 16.5" x 11" x 6.5" |
| Medium tote | 32 qt | 18.8" x 14.4" x 10.5" |
| Large tote | 40 qt | 19.1" x 15" x 11.5" |
| X-Large tote | 53 qt | 22" x 16.5" x 13" |
| Under-bed box | 40 qt | 28.5" x 18" x 6.3" |
Dimensions sourced from IRIS USA's published product specifications for its current storage tote and under-bed box lines, cross-checked against each product's individual listing.
Put your storage bins to work
Once you know which bin size fits, here is where to use that information. Write the bin's exterior dimensions on a sticky note before you shop. Or save them in your phone's notes app, or screenshot the table above so you have the right storage bin size on hand at the store instead of guessing from memory. The same numbers work whether you are buying your first set of totes or swapping mismatched bins for ones that line up on the shelf.
- Garage shelving ideas for setting up the shelf itself before you load it
- Closet organization ideas for fitting bins onto a closet shelf alongside hanging storage
- Pantry shelving ideas for bin-based pantry systems
- Garage shelf weight capacity planner to check your shelf can hold the bins once they are full