Gridfinity Sizes & Dimensions

Gridfinity uses two numbers: grid units for how wide and deep a bin is, and height units for how tall. Once you know these, you can figure out what fits in your drawer and what bins to print.

Grid Units (Width & Depth)

1 grid unit = 42mm. Every Gridfinity bin and baseplate uses this. A "2×3" bin is 2 units wide (84mm) and 3 units deep (126mm).

Half-Bin Mode

For tighter fits, half-bin mode uses 0.5-unit increments (21mm). A 1.5×2.5 bin would be 63mm × 105mm. Enable this in the layout tool by pressing H.

Why is Gridfinity 42mm?

The 42mm grid is the single standard that makes every Gridfinity bin and baseplate interchangeable. Zack Freedman chose 42mm when he designed Gridfinity in 2022 because it hits a sweet spot: small enough that a 1×1 bin holds individual screws or SD cards without wasting space, but large enough that bins print quickly and stay strong.

42mm also divides cleanly into common drawer and print-bed sizes, and it leaves room for the wall thickness, tolerance gap, and the interlocking base profile that lets bins lift out easily while still resisting sliding when you open a drawer. Because the number is fixed, a bin you print today fits a baseplate someone else designed years ago — that universal compatibility is the whole point of the standard.

The standard Gridfinity size is one 42mm × 42mm grid unit, with heights measured in 7mm increments. Everything else is a multiple of those two numbers.

Height Units

1 height unit (1U) = 7mm. This is how much vertical space you get inside the bin. A 3U bin holds items up to about 21mm tall.

How to Convert Your Drawer Measurements

Grab a tape measure and get your drawer's inside dimensions in millimeters. Then:

1. Measure the inside width and depth in millimeters
2. Divide each by 42
3. Round down to the nearest whole number (or half, if using half-bin mode)

Example

Drawer width:  380mm ÷ 42 = 9.04 → 9 units
Drawer depth:  520mm ÷ 42 = 12.38 → 12 units
Layout size:   9 × 12 (378mm × 504mm)
Gap at edges:  2mm width, 16mm depth

Small gaps at the edges are normal. Baseplates don't need to fill every millimeter. Most people center the baseplates and ignore the gap.

Common Bin Sizes

These are what most people print. You can create any of these (or any custom size) in the bin generator.

Will It Fit on Your Print Bed?

Most FDM printers have a 220–256mm bed, which handles bins up to about 5×5 or 6×6 units. Anything larger needs to be split or printed in sections. The layout tool defaults to a 256mm print bed and will flag bins that won't fit.

Quick Reference

Next Steps

Now that you know the sizes, generate a custom bin or open the layout planner to see how bins fit in your drawer.

New to Gridfinity? Here's a quick overview of how the system works.

Plan Your Layout →