Sizing calculator
Estimate minimum tray length
Measure the usable mounting zone
Look underneath before measuring the desktop itself. Crossbars, control boxes, drawer rails, and cable grommets can shorten the clear mounting zone. Leave access to screws and controls. A tray that fits the desktop width can still collide with the frame.
Allow width and depth for plugs
Tray length handles the power strip. Tray depth and wall height determine whether transformer plugs, charging bricks, and coiled cable fit without falling out. Arrange the largest adapters beside the strip and measure that bundle at its widest point.
Check the mounting method
Clamp-on trays need enough exposed desktop edge and a clamp opening that matches the desktop thickness. Screw-mounted trays need safe screw depth and a solid mounting surface. Confirm that no fastener can reach the top surface.
Plan for a standing desk
The tray should move with the desktop. Route one power lead toward the wall and test the desk at its lowest and highest positions before securing the final loop. Keep slack away from lifting columns and pinch points.
Common questions
How long should a cable tray be?
Add the power strip length, room for oversized plugs, and clearance at both ends. Then compare that number with the unobstructed mounting zone.
Should the power strip face up or sideways?
Use the orientation that keeps switches reachable and plugs seated while staying within the tray's height. Follow the power strip manufacturer's mounting guidance.
Related pick
Under-desk cable tray
Compare the calculated minimum with the product's usable interior length, depth, clamp opening, and mounting clearance.