Desk And Chair Height Calculator

What Is The Ideal Sitting Desk Height

At or slightly below your elbow level while sitting is the optimal ergonomic desk height. The Canadian Centre for Occupational Health and Safety recommends a 90 to 110-degree elbow bend. This calculator is specifically engineered to find that exact sweet spot for your body.

How The Calculator Works

We draw on data from 6,068 participants in the U.S. Army Anthropometric Survey (ANSUR II), which is one of the largest collections of real human body measurements in existence.

Because sitting elbow height is measured from the seat rather than the floor, the correct desk height depends on your chair height. To calculate both, the tool first estimates your popliteal height (the distance from the floor to your knee crease), and adds 3 to 4 cm to account for seat compression and put your hips above the knees. Then the average seated elbow height for your stature is stacked.

Formulas used (h = stature in cm)

Although women have proportionally longer torsos, men’s broader shoulders and arm proportions cause their elbows to rest slightly higher above the seat.

For a complete breakdown of our regression models, view our full data tables for elbow height by stature.

Desk Height Range Calculations

The Top Bound (90°): The absolute highest your desk should be. This is literally your elbow height relative to the floor plus or minus the thickness of the keyboard.

The Bottom Bound (110°): Using biomechanical trigonometry, we estimate your forearm length (roughly 15% of your total height) and calculate the precise vertical drop required to open your elbow angle by 20 degrees. The lowest your desk should be.

Why Keyboard and Shoe Height Matter

Both have an impact on your furniture height and sitting posture:

• To prevent shoulder shrugging, the calculator automatically subtracts your keyboard’s thickness from the total recommended desk height. A thicker keyboard can increase wrist extension, but proper desk height minimizes the strain by allowing your hands to easily hover slightly above the keys.
• Wearing heels or thick-soled shoes raises your knees, which shifts your ideal chair and desk height.

Tips for Non-Adjustable Furniture

Use the “Set Custom Height” toggles in the calculator to get tips exact accessory recommendations.

For a high desk

A keyboard tray is the most effective fix, as it drops the typing surface independently, letting you keep the chair at the right height. If that is not an option because of thigh clearance for example, raise the chair and add a footrest.

The calculator will suggest the exact height needed when you select enter your desk height.

If the desk is too low

Place risers or dense rubber furniture feet under the desk legs. For a DIY option hardwood blocks cut to size work well too.

If the chair won’t go high enough

The reliable long-term solution is installing a taller gas cylinder or purchasing a new chair. For a quick fix, a high-density seat cushion or a folded blanket provide a small raise. Just keep in mind that doing this possibly shifts your alignment with the chair’s built-in lumbar support and armrest height.