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Desk height and seated ergonomics
The desk in front of you was almost certainly designed for someone six foot two.
On this page (6 sections)
Short answer
A seated desk should sit at your elbow height, which is roughly your standing height x 0.40: about 27 in (69 cm) for a 5 ft 8 in (173 cm) user. The mass-market fixed desk is 29 to 30 in (74 to 76 cm), which is elbow height for someone around 6 ft 2 in (188 cm). If the desk cannot move, raise the chair until your elbows are level with the surface and put a footrest under your feet to restore floor contact.
The numbers, at a glance
- Fixed desk, industry standard
- 29 to 30 in (74 to 76 cm)suits a user around 6 ft 2 in
- Seated desk height rule
- standing height x 0.40seated elbow height
- Standing desk height rule
- standing height x 0.62standing elbow height
- Sit-stand adjustment range
- 22 to 48 in (56 to 122 cm)ANSI/BIFMA G1 target span, 5th to 95th percentile
- Chair seat height
- 16 to 21 in (41 to 53 cm)feet flat on floor or footrest
- Knee clearance height
- 24 to 27 in (61 to 69 cm)27 in at an accessible work surface, ADA 306.3
- Knee space width
- 20 in minimum, 30 in (51 to 76 cm) preferred
- Desk depth
- 24 in minimum, 30 in (61 to 76 cm) with a monitor
The standard, and the one person it fits#
A mass-market desk is 29 to 30 in (74 to 76 cm) high. That number is inherited, not derived: it comes from the writing desk and the typewriter table, and it survived because one fixed height is cheaper to build and ship than an adjustable one.
The height a desk should be is your seated elbow height. Sit with feet flat, upper arms hanging vertically, shoulders down, forearms at roughly 90 degrees. Where your forearms fall is where the work surface belongs.
That height is the sum of two measurements, both scaling with stature:
- Seat height is popliteal height, floor to the underside of the knee, about 0.25 x stature.
- Elbow height above the seat is about 0.14 to 0.15 x stature.
Add them and the seated work surface lands at roughly 0.39 to 0.40 x stature. Standing elbow height is about 0.62 x stature.
Height table#
| Your height | Seated desk | Standing desk | Chair seat |
|---|---|---|---|
| 5 ft 0 in (152 cm) | 24 in (61 cm) | 37 in (95 cm) | 15 in (38 cm) |
| 5 ft 2 in (157 cm) | 24.5 in (62 cm) | 38.5 in (98 cm) | 15.5 in (39 cm) |
| 5 ft 4 in (163 cm) | 25.5 in (65 cm) | 39.5 in (100 cm) | 16 in (41 cm) |
| 5 ft 6 in (168 cm) | 26 in (66 cm) | 41 in (104 cm) | 16.5 in (42 cm) |
| 5 ft 8 in (173 cm) | 27 in (69 cm) | 42 in (107 cm) | 17 in (43 cm) |
| 5 ft 10 in (178 cm) | 27.5 in (70 cm) | 43.5 in (110 cm) | 17.5 in (44 cm) |
| 6 ft 0 in (183 cm) | 28.5 in (72 cm) | 44.5 in (113 cm) | 18 in (46 cm) |
| 6 ft 2 in (188 cm) | 29 in (74 cm) | 46 in (117 cm) | 18.5 in (47 cm) |
| 6 ft 4 in (193 cm) | 30 in (76 cm) | 47 in (120 cm) | 19 in (48 cm) |
Read the seated column and the standard desk falls into place. 29 in is correct at 6 ft 2 in. 30 in is correct at 6 ft 4 in.
What the standards require#
ANSI/HFES 100 treats a fixed-height surface as a compromise and puts its weight on adjustability and on clearance underneath. ANSI/BIFMA G1 is the more useful document when buying: it frames the target as the 5th percentile female through the 95th percentile male, which for a sit-stand desk means a span from roughly 22 in (56 cm) to about 48 in (122 cm). The seated half of it, 22 to 33 in (56 to 84 cm), is what a good electric column desk gives you.
ADA 2010 carries the only hard numbers. Section 902.3 puts an accessible work surface between 28 and 34 in (71 and 86 cm); 306.3 requires 27 in (69 cm) of knee clearance, 30 in (76 cm) wide. Note the collision: a 29 in desk with a 3 in apron has 26 in of clearance and fails 306.3 by an inch. It is the clash between surface height and what fits underneath that also governs counter and cabinet heights.
Beware the desk sold as adjustable from 28 to 47 in (71 to 119 cm): the bottom of that range is above the correct seated height for anyone under about 5 ft 10 in.
Chair first, desk second#
The chair sets the datum the desk height is measured from.
- Seat height. Standing in front of the chair, the seat should meet just below your kneecap. Sitting, your feet are flat and your thighs horizontal or sloping down 5 to 10 degrees. Task chairs cover roughly 16 to 21 in (41 to 53 cm).
- Seat depth. Leave 2 to 3 in (5 to 8 cm) between the seat edge and the back of your calf. Deeper presses on the popliteal area, and you compensate by sitting forward, abandoning the backrest.
- Armrests. Set them level with your relaxed elbows, then set the desk to match. Armrests above the desk hold your forearms off the surface all day.
Clearance under the desk#
| Dimension | Minimum | Preferred | Metric |
|---|---|---|---|
| Knee clearance height (front edge) | 24 in | 27 in | 61 to 69 cm |
| Knee space width | 20 in | 30 in | 51 to 76 cm |
| Knee space depth at knee level | 15 in | 18 in | 38 to 46 cm |
| Foot space depth at floor level | 21 in | 24 in | 53 to 61 cm |
| Thigh clearance, seat to desk underside | 6.5 in | 8 in | 17 to 20 cm |
| Desk depth | 24 in | 30 in | 61 to 76 cm |
The number that catches people is thigh clearance. Seat at 18 in (46 cm) plus 6.5 in (17 cm) of thigh means the desk underside cannot be below 24.5 in (62 cm). A 29 in desk with a 1 in top and a 3.5 in apron puts its underside at 24.5 in exactly, so a keyboard tray fitted under that apron runs into your own thighs. Measure the apron before you buy the tray.
Depth interacts with the screen: a stand takes 8 to 10 in (20 to 25 cm) before the glass begins, so a 24 in (61 cm) desk puts a 27 in monitor about 16 in (41 cm) from your eyes. See monitor distance, height and position.
Fixing a desk you cannot change#
Keyboard tray. A tray drops the keying surface 2 to 4 in (5 to 10 cm), turning a 29 in desk into a 25 to 27 in keying height, correct between about 5 ft 3 in and 5 ft 10 in. Use negative tilt, 0 to 15 degrees, and check your remaining knee clearance first.
Raise the chair and add a footrest. Raise the seat 2.5 in (6 cm) to reach a 29 in desk and your feet leave the floor by the same 2.5 in, so the footrest platform is 2.5 in high, not the 4 in that most of them are. Get an adjustable one, at least 12 x 18 in (30 x 46 cm), angled 10 to 15 degrees.
Cut the legs. On a timber or steel-leg desk this is a 20 minute job with a mitre saw, and the only fix that corrects the height without spending knee clearance.
How to check yours in five minutes#
- Sit, feet flat, seat adjusted until your thighs are horizontal. Measure seat top to floor against the chair column above.
- Let your arms hang. Measure floor to the underside of your elbow: that is your target desk height.
- Measure the desk. The difference is your error.
- Measure the underside of the apron. Under 24 in (61 cm) you are short on knee clearance already, so a tray is out.
- Under 1 in (2.5 cm) of error, ignore it. 1 to 3 in, a tray or a footrest fixes it. Over 3 in, cut or change the desk.
Chair travel and the walkways around the desk are in home office layout and clearances, the wall above it in bookshelf and shelving dimensions.
Frequently asked questions#
What is the correct desk height for my height?
Multiply your standing height by 0.40 for a seated desk and by 0.62 for a standing one. A 5 ft 4 in (163 cm) user wants about 25.5 in (65 cm) seated and 39.5 in (100 cm) standing. A 6 ft (183 cm) user wants about 28.5 in (72 cm) and 44.5 in (113 cm). Measure to the top of the work surface, wearing the shoes you normally work in.
Is a 30 inch desk too high?
For most adults, yes. A 30 in (76 cm) surface is seated elbow height for someone about 6 ft 3 in (190 cm) tall. At 5 ft 6 in (168 cm) it is roughly 4 in (10 cm) too high, which either lifts your shoulders or forces your wrists into extension. The cheapest correction is a keyboard tray that drops the keying surface 2 to 4 in (5 to 10 cm).
How high should a standing desk be?
At or just below your standing elbow height, which is about 0.62 x your standing height: 43 to 44 in (110 to 112 cm) for a 5 ft 10 in (178 cm) user. Many people prefer 1 to 2 in (3 to 5 cm) below true elbow height for typing, because the keyboard adds its own thickness and a slight downward forearm angle is comfortable.
How much knee clearance do you need under a desk?
24 in (61 cm) of clear height at the back of the knee space as an absolute minimum, 27 in (69 cm) at the leading edge if the desk needs to be accessible under ADA 306.3. Width should be at least 20 in (51 cm) and preferably 30 in (76 cm). Allow 15 in (38 cm) of depth at knee level and 24 in (61 cm) at foot level.
Should my feet be flat on the floor when working?
Yes. Feet flat with thighs roughly horizontal is what keeps your weight on your sit bones rather than on the underside of your thighs, where pressure on the back of the knee restricts circulation. If raising the chair to reach a too-high desk lifts your feet, you have not fixed the problem, you have moved it. Add a footrest of the same height as the gap you created.
Do I need a keyboard tray?
Only if the desk is fixed and too high, which is the common case. A tray that drops the keying surface 2 to 4 in (5 to 10 cm) below a 29 in (74 cm) desk brings it to the correct height for a user of about 5 ft 6 in to 5 ft 10 in (168 to 178 cm). The cost is knee clearance: the tray and its mechanism eat 2 to 3 in (5 to 8 cm) of the space under the desk.
How deep should a desk be?
24 in (61 cm) is the working minimum for a laptop and paper. 30 in (76 cm) is what you need to sit a monitor at arm's length, because a monitor stand takes 8 to 10 in (20 to 25 cm) of that depth before the screen surface begins. Curved ultrawide monitors and dual screens on arms want 30 to 36 in (76 to 91 cm).
Sources and standards referenced#
- ANSI/HFES 100-2007, Human Factors Engineering of Computer Workstations Human Factors and Ergonomics Societyseated work surface heights, clearances and adjustment
- ANSI/BIFMA G1, Ergonomics Guideline for Furniture Used in Office Work Spaces Designed for Computer Use BIFMAwork surface adjustment range for 5th percentile female to 95th percentile male
- 2010 ADA Standards for Accessible Design US Department of Justice902.3 work surface height 28 to 34 in; 306 knee and toe clearance
- Anthropometric Reference Data for Children and Adults: United States CDC National Center for Health Statisticsmean adult stature
- Human Dimension and Interior Space Panero and Zelnik, Whitney Library of Designpopliteal height, seated elbow height, work surface clearances
- Architects' Data Ernst Neufert, Wiley-Blackwelldesk and workplace dimensions
We cite published codes, industry planning guidelines and manufacturer specifications. Where a figure is our own recommendation rather than a published standard, the text says so. See how we measure.