A keyboard tray is not better just because it's wider. The width needs to accommodate the keyboard, mouse, and wrist movement simultaneously, but it also cannot hit desk legs, drawers, or chair armrests.
First, decide where to place the mouse
If you use a full-size keyboard and place the mouse on the same surface, a wider tray will be more comfortable; if you use a shorter keyboard or trackball, a shorter model can already free up enough desk space.
- Measure the actual width of the keyboard
- Reserve at least one mouse activity area
- Include the thickness of the wrist rest in the depth calculation
65 cm: Small desk and basic input configuration
65 cm is easier to avoid desk legs or under-desk storage, suitable for short keyboards with a standard mouse. The key is to confirm the front-to-back depth required by the slide rails or clamps.
68 cm: Storage and hand curve
Drawer-style or curved front edges can improve storage and arm proximity, but different desk edge shapes will affect the fit. Before ordering, take photos of your desk edge thickness and chamfer for documentation.
86 cm: Dual devices or extensive mouse movement
Extended models are suitable for full-size keyboards, numeric keypads, and larger mouse areas, but they also most require checking the distance to desk legs, the width of chair armrests, and the moving space after pulling out.
