A monitor arm replaces a monitor’s fixed stand with an articulated arm that clamps to the desk edge or mounts to a desk grommet. The main benefit is space: the arm holds the monitor at the correct eye level while freeing the desk surface underneath it. On a small desk, that recovered space is meaningful. For positioning both monitors in a dual-screen setup, see the dual monitor home office setup guide.
What a monitor arm does
Fixed monitor stand vs. monitor arm
| Feature | Fixed stand | Monitor arm |
|---|---|---|
| Desk footprint | Full stand base — typically 20–30 cm deep | Single clamp or grommet hole — near zero footprint |
| Height adjustment | Fixed or limited range | Full vertical range — set to exact eye height |
| Tilt and swivel | Limited | Full range — tilt, swivel, rotate for portrait mode |
| Cable management | Cables hang behind stand | Most arms include a cable channel along the arm |
| Monitor removal | Lift off stand | Quick-release VESA plate on most arms |
| Cost | Included with monitor | £25–£150 depending on arm type and weight rating |
VESA compatibility: what to check first
Before buying a monitor arm, confirm your monitor has a VESA mount pattern on the back. Most monitors 22 inches and above do.
How to check:
- Look for four screw holes in a square pattern on the back of the monitor
- The standard pattern is 75×75 mm or 100×100 mm for most home office monitors
- Larger monitors (27 inch+) may use 100×100 mm or 200×100 mm
- The monitor’s manual or spec sheet will list “VESA mount: 100×100 mm” or similar
- Ultrawide monitors often use 100×100 mm but at higher weight — check the arm’s weight rating
If the monitor has no VESA holes, it cannot be used with a standard monitor arm. Some curved all-in-one monitors fall into this category.
Types of monitor arm
Monitor arm types and best use cases
| Type | Mounting method | Best for | Limitation |
|---|---|---|---|
| Single-monitor clamp arm | Clamp to desk edge | One monitor, most common setup | Requires desk edge 2–6 cm thick |
| Single-monitor grommet arm | Through desk grommet hole | Cleaner installation, hides the base | Requires a hole in the desk |
| Dual-monitor arm (stacked) | Single clamp, two VESA plates | Two monitors on a small desk | Both monitors share one vertical axis — limited independent movement |
| Dual-monitor arm (side by side) | Single clamp, two separate arms | Wide dual-monitor setup | Requires a desk at least 120 cm wide |
| Laptop + monitor arm combo | Clamp with one VESA and one laptop tray | Laptop-plus-external-monitor setup | Laptop tray adds width — check arm extension length |
Weight and size limits
Every monitor arm has a maximum weight capacity. Exceeding it causes the arm to drift downward over time and may damage the mounting mechanism.
- Most home office monitors (21–27 inch): 3–7 kg — any standard arm rated for 8 kg covers this
- Large monitors (28–32 inch): 5–10 kg — check the arm’s maximum; cheaper arms may be under-rated
- Ultrawide (34 inch+): 6–12 kg — use an arm rated for at least 12 kg with a heavy-duty clamp
Also check the arm’s reach: the maximum horizontal extension from the mounting point. A 40 cm reach covers most single-monitor setups. For desks deeper than 80 cm, ensure the arm can extend far enough to position the monitor at the correct viewing distance (50–70 cm from eyes to screen).
When a monitor arm is worth the cost
Cable management with a monitor arm
Monitor arms create a clean look on the desk but can make cable management more visible if cables are left loose. Most arms include a channel or clips along the arm to route the monitor’s power and data cables.
After mounting, route the monitor cable through the arm’s cable channel, then down the arm post to the desk. From there, route to a cable management tray or box under the desk. This gives a single drop from the arm post to the under-desk space rather than a visible loop of cable from monitor to desk.
For a full approach to under-desk cable routing, see the under-desk cable management guide.
Frequently asked questions
What VESA size do most home office monitors use?
Most monitors 22–27 inches use a 100×100 mm VESA pattern — four M4 screws in a 10 cm square. Smaller monitors sometimes use 75×75 mm. Check the monitor's spec sheet before ordering an arm; the pattern is usually printed near the VESA holes on the monitor back.
Can a monitor arm damage a desk?
A clamp arm can leave marks on softer desk surfaces, especially particleboard. For thin or soft-top desks, add a rubber pad between the clamp and the desk surface — most arms include one. For desks with hollow sections near the edge (some flat-pack desks), a grommet mount or a clamp with a wide jaw spreads the load better.
How far should a monitor arm extend from the desk edge?
Position the monitor screen 50–70 cm from your eyes when seated at normal position. Measure the distance from your seated eye position to the desk edge, then add enough to account for monitor depth. A 35–45 cm arm extension covers most setups where the desk edge is within arm's reach.
Do monitor arms work with ultrawide monitors?
Yes, but check the weight rating and VESA pattern carefully. Ultrawides are heavier (often 8–12 kg) and sometimes use non-standard VESA patterns. Use an arm rated for at least 15 kg for a 34-inch ultrawide and confirm the VESA size matches before buying.