Start with chair height
Seat height is measured from the floor to the top of the compressed seat cushion. For most adults, this falls between 38 cm and 52 cm. The adjustment target is a position where both feet rest flat on the floor and the thighs remain approximately parallel to it — or angled slightly downward at the front.
If your feet do not reach the floor after adjusting the chair to achieve neutral thigh position, a footrest compensates without compromising posture. This situation is common in apartments and shared offices where furniture is not individually fitted.
Neutral elbow position: Upper arms hang loosely at the sides, forearms roughly parallel to the floor (or slightly angled downward toward the keyboard). The wrists stay straight, not flexed up or bent down, when reaching the keyboard.
Calculating desk height
Once seated correctly, measure the distance from the floor to the bottom of your relaxed elbow. This measurement — typically between 68 cm and 76 cm for average adult height ranges — becomes the target desk surface height.
Standard desks in Canada are manufactured at approximately 74–76 cm. This suits individuals between roughly 170–180 cm tall when using standard office chairs. Taller or shorter users either require adjustable-height desks or need to compensate through chair and footrest adjustments.
Adjustable-height desks
Height-adjustable sit-stand desks are available across a wide price range from Canadian retailers. The mechanical hand-crank models start below $300, while electric-motor desks with memory presets run between $500 and $1,200 depending on surface size and frame quality.
The practical argument for sit-stand desks is not that standing is inherently better than sitting, but that alternating positions reduces the sustained load on any single muscle group. Occupational health guidance from the Canadian Centre for Occupational Health and Safety (CCOHS) notes that prolonged static postures — whether sitting or standing — are associated with musculoskeletal discomfort.
Keyboard and mouse placement
The keyboard should sit at desk height or slightly below it, keeping the wrists neutral. Keyboard trays that drop the typing surface below desk level achieve this in situations where desk height cannot be lowered further.
Mouse placement should be as close to the keyboard as the desk layout allows. Reaching repeatedly to a mouse positioned far to the side introduces lateral shoulder load over a full work day. Extended mouse bases that sit alongside full-size keyboards keep the mouse within a shorter reach arc.
Armrest use
Chair armrests are often used inconsistently — adjusted to a height that provides support during breaks but is too high to allow the chair to slide under the desk while working. In this configuration, armrests push the shoulders up and away from neutral. When this is the case, removing or lowering the armrests until the chair fits under the desk is the more practical solution than raising the desk.
When standing: a separate calculation
For standing desk use, the desk height calculation shifts. The target is elbow height while standing upright — typically 95–110 cm for adults in the average height range. Standing work surfaces run about 20–25 cm higher than seated work surfaces for the same person.
A common mistake with sit-stand desks is setting a single height as a compromise between sitting and standing positions. The result is a height that is suboptimal for both. Desks with memory presets allow accurate return to separate seated and standing heights without measuring each time.
Anti-fatigue mats reduce discomfort during extended standing periods. A mat 5–8 cm thick with a bevelled edge covers the minimum requirement. Hard flooring — common in urban Canadian condos and apartments — increases lower limb fatigue noticeably during standing work of more than 30 minutes.
Laptop-specific setups
Laptop screens, when placed on a desk at typing height, position the display too low — forcing sustained neck flexion. The standard solution is a laptop stand that raises the screen to eye level, combined with a separate keyboard and mouse placed at desk height.
This converts a laptop into a desktop-equivalent configuration at minimal cost. Laptop stands range from fixed-angle units under $30 to adjustable models with ventilation up to $150. The critical specification is that the stand raises the screen center to approximately eye level when seated with neutral neck posture.
Notes on Canadian housing
Many remote workers in Toronto, Vancouver, Calgary, and Ottawa work in apartments or condominiums with limited floor area. Compact ergonomic setups — wall-mounted fold-down desks, under-desk keyboard trays, and monitor arms rather than stands — preserve floor space while achieving correct positioning.
In older Canadian housing stock, particularly in cities like Montreal and Hamilton, floor surfaces are often hardwood or laminate over concrete or wood joists. Anti-fatigue mats become more relevant in these environments. Heated floors in newer construction slightly reduce standing fatigue but do not eliminate it.