Table of Contents
When shopping for an ergonomic office chair, labels such as “2D,” “3D,” “4D” and “5D armrests” can be difficult to compare. These numbers generally describe how many adjustments the armrests offer. On their own, however, they do not tell you whether the armrests will suit your body and workstation.
The right choice supports your forearms comfortably, without raising your shoulders, pushing your elbows unnecessarily outward or restricting movement. Here is how to identify useful adjustments and compare the available configurations.
What do 1D to 5D armrest labels mean?
The “D” refers to dimensions or adjustment options. A 1D armrest generally adjusts in height, while a 5D model may offer five movements.
Keep in mind that these labels do not represent a universal list of adjustments. Two armrests described as 4D may offer different movements. Check the functions and adjustment ranges of the specific configuration you are considering.
The following table shows examples offered by Solutions M3. These categories help compare functions; they do not replace the manufacturers’ descriptions.
| Configuration | Example adjustments | Example at Solutions M3 |
|---|---|---|
| 1D | Height | YouToo with height-adjustable armrests |
| 2D | Height and width | airCentric 2, depending on configuration |
| 3D | Height, width and pivot | airCentric 2, depending on configuration |
| 4D | Height, width, lateral arm pad movement and pivot | YouToo with multidirectional armrests |
| 5D | Height, width, lateral arm pad movement, depth and pivot | Optional on the Cierra 660 and airCentric 2 |
The 4D row describes the YouToo configuration. It does not mean that every 4D armrest, including those on other chairs, offers exactly these movements.
The five adjustments and what they do
Height supports your forearms
Height adjustment raises or lowers the armrests. Once seated in your working position, you should be able to rest your forearms lightly on the pads while keeping your shoulders relaxed.
Armrests set too high may cause you to raise your shoulders. If they are too low, they may not provide the support you need. The adjustment range matters as much as the presence of the feature: the minimum or maximum height must suit your body.
Width adapts the distance between armrests
Width adjustment generally changes the position of the entire armrest assembly relative to the seat. It lets you adapt the spacing to your body.
If the supports are too far apart, you may move your elbows outward to reach them. If they are too close together, they may reduce your available space and restrict movement. A wider seat does not automatically provide a more comfortable position for your arms.
Lateral movement brings the arm pads closer
The arm pad is the surface that supports your forearm. Lateral adjustment moves it inward or outward without necessarily moving the entire armrest.
This differs from width adjustment. Both can change the position of the supports, but they act on different parts of the mechanism.
At Solutions M3, we pay particular attention to lateral arm pad adjustment. It helps bring the support surfaces closer to the body, especially for someone with narrow shoulders or when the seat is relatively wide.
Depth moves the pads forward or backward
Depth adjustment moves the arm pads forward or backward. It lets you adapt their position to your forearms and the clearance around your desk.
A pad positioned too far forward may touch the desk edge before you can bring the chair close enough. Moving it backward may improve clearance, provided the workstation’s shape and height also allow it.
Pivot aligns the arm pads
Pivot adjustment changes the angle of the support surface. It helps the pads follow the direction of your forearms, which varies with factors such as your body proportions and the position of your keyboard and mouse.
This is the other adjustment we pay particular attention to when advising customers. The goal is to find a natural support position rather than forcing your arms to follow the angle of the armrests.
Which adjustments suit your use?
For occasional use
Height-adjustable armrests may be enough if their position already suits your body. Width adjustment becomes useful when you need to change the spacing.
Even for short periods, check that the supports do not make you raise your shoulders or move your arms outward. Using a chair less often does not correct a poor fit between the chair and your body.
For everyday computer work
Lateral movement and pivot can make it easier to support your forearms while using a keyboard and mouse. Depth adjustment is useful when you need to change the position of the pads or improve clearance near the desk.
These movements are worth trying or examining, but no number of “Ds” guarantees comfort. A simpler configuration may work well if it offers the right adjustment ranges.
For different body proportions or shared workstations
For shorter or taller users, people with narrow shoulders or those with a larger build, examine the actual dimensions and adjustment ranges. Four movements that do not reach far enough will not necessarily solve a positioning problem.
At a shared workstation, multiple adjustments can help accommodate different users. Ease of use matters just as much: everyone should be able to find their support position without complicated adjustments.
Three chairs and their configurations
Cierra 660 by Horizon Furniture
The Cierra 660 is offered by Solutions M3 with standard 4D armrests and an optional 5D configuration. The latter includes height, width, lateral movement, depth and pivot.
Compare the movements included in your chosen configuration rather than assuming its 4D armrests are identical to those on another chair.
airCentric 2 by ergoCentric
The airCentric 2 offers several possibilities at Solutions M3: height and width; height, width and pivot; or a 5D option with all five movements described above.
This variety lets you choose useful features without automatically selecting the most adjustable configuration. Our team can clarify the options available for your configuration.
YouToo by Allseating
The YouToo is offered with height-adjustable armrests or a configuration combining height, width, lateral movement and pivot.
The second choice corresponds to the 4D example in the table. It illustrates why you should check a model’s options, not just the chair’s name.
How to adjust your armrests
- Start with the chair and your position at the desk. Your feet should rest comfortably on the floor or on a suitable footrest. Also check that you can reach your equipment without leaning too far forward.
- Relax your shoulders and adjust the height. Keep your arms close to your body, then raise or lower the pads to support your forearms lightly without lifting your shoulders.
- Adapt the spacing. Use width and lateral adjustment, if available, to bring the supports closer without crowding your body or restricting movement.
- Adjust pivot and depth. Align the pads with your forearms and check that they do not bump against the desk.
- Test the settings while working. Use your keyboard and mouse. A position that feels comfortable when still should also allow free movement during your tasks.
Your work surface can also support your forearms. Armrests do not need to remain in contact with your arms during every movement or keep you in a rigid position.
Common mistakes and features to compare
When advising customers, we frequently see armrests positioned too high or too far from the body. Before deciding that you need more adjustments, check the features on your chair and how they are currently set.
Also consider:
- Adjustment range: can the supports reach the position you need?
- Arm pads: do their dimensions, shape and feel suit you?
- Mechanisms: are they easy to operate and sufficiently stable during normal use?
- Workstation fit: do the armrests let you bring the chair close enough and reach your keyboard and mouse?
Should you choose 5D armrests?
The 5D option is useful when an additional movement lets you achieve a position that a simpler configuration cannot provide. If 2D, 3D or 4D armrests already suit you, a fifth adjustment will not necessarily add a benefit.
Compare the added cost with the functions you actually need. Consider the seat dimensions, backrest and chair mechanism as well: highly adjustable armrests cannot compensate for a poorly fitting chair.
Unsure which configuration to choose? Explore our ergonomic office chairs or ask Solutions M3 for advice. We can help you compare the options, and you can also try different models in our showroom.
Frequently asked questions
What is the difference between 4D and 5D armrests?
The 5D label generally indicates one additional adjustment. The included movements vary by manufacturer and configuration, however. Compare the exact list rather than the number alone.
Can you work comfortably without armrests?
That depends on your position and workstation. The work surface can also support your forearms. Useful armrests should provide support without restricting movement or preventing you from bringing the chair close enough to the desk.
How high should armrests be?
There is no universal height. Look for light forearm support with relaxed shoulders, then check the result in your usual keyboard and mouse position.
Are width and lateral adjustment the same?
No. Width adjustment generally moves the entire armrest assembly, while lateral adjustment moves its pad. Both can bring the support surfaces closer to your body, with ranges that vary by model.
