A keyboard tray needs to fit in three places: beneath the desktop, around your keyboard and mouse, and above your legs. Measuring only the visible platform misses the mounting mechanism and the space it needs to move.
Before ordering, make a quick underside sketch and test where your hands would sit. This guide helps you decide whether a tray can work with your existing desk, rather than assuming every desk can accept the same accessory.
Start beneath the desktop
Look under the desk with a torch. Mark the front edge, frame rails, crossbars, drawers, cable trays and control boxes. Photograph the underside straight on, with a tape measure visible. A wide desktop can still have very little usable mounting space.
Ask for the tray's mounting template and installation instructions. The platform dimensions do not tell you the screw-hole pattern, mounting-track length or required clearance behind the mechanism. Compare each of those measurements with your sketch before choosing a position.
Also confirm the desktop construction. A solid-looking surface might have a hollow core, thin underside or another construction that needs a specific fixing method. Use hardware approved for the accessory and desktop. Do not choose a screw length from the overall top thickness alone, and do not drill until the mounting method is confirmed.
Measure the devices you actually use
Put your keyboard and mouse on a table in their usual working positions. Include a separate number pad, if you use one, and move the mouse through a normal range of motion. Measure the whole working area, not just the keyboard casing.
Neva's FlexiSpot KT1B listing gives an approximate platform size of 66.4 × 24.5 cm and a recommended load up to 1 kg. It is a screw-mounted accessory designed for a keyboard and mouse. Those are useful first checks; they do not establish that its mounting mechanism fits your desk.
For example, a full-size keyboard might physically fit while leaving too little room for the way you use a mouse. A compact keyboard could change that calculation, but only if it suits your work. Test the layout with your own devices before buying either item.
Check the space above your knees
Sit in your normal chair position and measure the gap between your thighs and the desk underside. A tray and its mechanism occupy part of that gap. Include the chair's armrests in the check, especially if you slide close to the desk.
Use a lightweight cardboard outline to visualise the platform position without installing anything. Move the chair in and out. Check that you can reach both input devices without having to hold your elbows away from your body. OSHA's keyboard guidance supports arranging the keyboard and pointing device for relaxed shoulders and straight wrists.
The lowest possible tray setting is not automatically the right one. You need a position that works with your seat height, feet support and leg clearance. On a standing desk, repeat the fit check at the sitting and standing positions you intend to use.
Test the whole movement path
A tray may fit when fully extended but collide with a crossbar as it retracts. It can also hit a cable basket, chair arm or desk control. Ask to see the full extension and retraction movement on the relevant mounting arrangement.
Keep keyboard and mouse cables clear of the sliding mechanism. Allow enough movement without leaving a loop that catches on your legs. Do not use the tray as an armrest, to support your body weight or to hold heavy equipment.
Take this checklist to the seller
- Desktop material and thickness are identified.
- The mounting template fits an unobstructed underside area.
- The approved fixings will suit the desktop construction.
- Keyboard, mouse movement and any number pad fit the usable platform.
- Device weight is within the stated limit.
- Legs and chair arms remain clear throughout normal use.
- The mechanism can extend, retract and adjust without collisions.
If one measurement is missing, send Neva the underside photo and device layout before ordering. A confirmed fit is more useful than choosing by platform width alone.
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