Monitor Arm Fit Checker — VESA & Weight

Use the checker above to confirm fit before you buy. Enter your monitor’s size, weight, and VESA pattern, and it tells you whether a standard arm, a heavy-duty/ultrawide arm, or a VESA adapter is what you need.

The three things that decide fit

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1. VESA pattern — the square hole spacing on the back of the monitor. This is the VESA Flat Display Mounting Interface (FDMI) standard, which defines the common desktop pattern (the MIS-D family) as 75×75 mm or 100×100 mm. Standard arms target those two; larger displays may use 200 mm patterns that need a heavy-duty arm or adapter.
2. Weight — every arm has a load range. Gas-spring arms also have a minimum weight to stay balanced, so very light screens can drift up. Most single arms top out around 9 kg / 20 lb.
3. Size — beyond ~32 inches, and for most ultrawides, you want an arm specifically rated for the width and leverage.

Why the weight rating is a range, not a ceiling

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Gas-spring and mechanical-spring arms hold your monitor at any height by balancing its weight against a spring. That only works inside a band: too heavy and the arm sags and won’t stay up; too light and it floats upward on its own. So an arm rated “2–9 kg” isn’t just telling you the maximum — a 2.5 kg monitor on a heavy-duty arm can be as annoying as a 12 kg monitor on a light one. Match your monitor to the middle of an arm’s range when you can, and tension-adjust after mounting.

Where to find your numbers

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VESA pattern and weight are in your monitor’s spec sheet or manual (search the model number and “specifications”). Weight is usually listed two ways — with and without the stand; you want the weight without the stand, since that’s what the arm actually carries. If there are no VESA holes at all, plan for an adapter bracket that clamps to the existing stand.

The dimension people forget: reach and depth

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A monitor arm doesn’t just hold the screen up — it lets you push it back to a proper arm’s-length viewing distance and reclaim desk depth. Check the arm’s maximum extension against how far back you actually want the screen, especially on a shallow desk.

Once you know what fits, see our picks for monitor arms and risers for small desks or, for big screens, the guide to arms for ultrawide and heavy monitors.

Frequently asked questions

How do I know if a monitor arm will fit my monitor?

Three things have to line up: the VESA hole pattern on the back of your monitor (usually 75×75 mm or 100×100 mm), the monitor's weight (most single arms hold up to ~9 kg / 20 lb), and its size (most arms are rated to ~32 inches, with ultrawide-specific arms above that). Enter those above for an instant verdict.

What if my monitor has no VESA holes?

Many slim or consumer monitors omit VESA mounts. You can usually add a VESA adapter bracket that clamps to the stand neck or base, then attach a standard arm. Confirm the adapter is rated for your monitor's weight.

What VESA size is most common?

For desktop monitors, 100×100 mm is the most common, with 75×75 mm on smaller screens. Large or ultrawide displays sometimes use 200×100 or 200×200 mm, which need an arm or adapter rated for the larger pattern.

Can a normal monitor arm hold an ultrawide?

Often no. Ultrawides (especially 34 inches and up) are wider and heavier, so they need an arm rated for both the extra weight and the leverage. The checker flags when you're into ultrawide/heavy-duty territory.

Will a monitor arm attach to my desk?

Most arms mount either with a C-clamp (needs an open desk edge, typically up to ~2–3.4 inches thick) or a grommet (through a hole in the desk). Check your desk's edge thickness and depth, and make sure the surface is solid — thin, hollow, or glass tops may need a reinforcement plate or may not be safe to clamp at all.