Do you sit at your desk for 8 hours a day and wonder why you have back pain in the evening? The answer often lies in just a few centimeters: the height of your office chair.
The correct seat height determines knee angle, pelvic position, and spinal posture. 8 out of 10 office workers sit incorrectly – with measurable consequences: back pain, neck tension, and numb legs.
This guide will show you how to calculate your optimal seat height, adjust your chair correctly , and solve typical workplace problems.
Why is the correct seat height so important for an office chair?
Your seat height is the foundation for everything else. If it's incorrect, your entire body becomes unbalanced – from your pelvis to your neck.
Health effects of incorrect altitude
Chair too high:
- Feet dangle or stand on tiptoes
- Seat edge presses into thigh → circulatory problems
- Consequences: heavy legs, tingling, venous congestion
Chair too low:
- Knees higher than hips → pelvis tilts backwards
- Shoulders must be pulled up towards the table.
- Consequences: back pain, neck tension, herniated discs
Improved concentration through ergonomic seating
Pain reduces productivity. Those fighting against tension cannot fully concentrate. A correct seat height reduces physical strain and measurably improves work quality.
What is the optimal seat height? – Standards and recommendations
Standard range: 40-52 cm (covers 80% of the population)
Two quick formulas:
- Formula 1: Height × 0.25
- Formula 2: Height ÷ 3.72
Example for a height of 170 cm: 42.5 cm (Formula 1) vs. 45.7 cm (Formula 2)
International standards (e.g. DIN EN 1335)
DIN EN 1335-1:2020 requires a seat height adjustment range of 40-52 cm (not 40-51 cm as often stated). The DGUV (German Social Accident Insurance) additionally recommends an extended range of 42-53 cm.
The DIN seat height is measured with a 50 kg load. In practice, a chair will sink by 1-3 cm under load.
Recommended height according to body size
Two proven calculation formulas:
Formula 1: Height × 0.25
Formula 2: Height ÷ 3.72
| height | Formula 1 (×0.25) | Formula 2 (÷3.72) | Recommended area |
|---|---|---|---|
| 150 cm | 38 cm | 40 cm | 38-41 cm |
| 160 cm | 40 cm | 43 cm | 40-43 cm |
| 170 cm | 43 cm | 46 cm | 43-46 cm |
| 180 cm | 45 cm | 48 cm | 45-49 cm |
| 190 cm | 48 cm | 51 cm | 48-52 cm |
| 200 cm | 50 cm | 54 cm | 50-54 cm |
These formulas are based on DIN 33402-2 (anthropometric data), according to which 95% of the German population requires a seat height between 35-48 cm.
How to adjust the seat height of your office chair correctly
- Sit all the way in the back, with your back against the seat backrest.
- Place your feet flat on the ground – complete ground contact
- Position knees at a 90-100° angle, ideally at hip height
- Forearms relaxed and horizontal on table or armrests
- Check: no pressure under the thighs, upright posture without effort
Common mistakes when setting up a new system
❌ Setting too fast – Take 5-10 minutes
❌ Ignore table height – follow the elbow rule (90° angle)
❌ Consider in isolation – Always from bottom to top: Seat height → Seat depth → Backrest
The right combination of seat height and table height
First adjust the chair to your body, then adjust your workstation accordingly.
Practical procedure:
- Adjust the chair optimally
- Bend elbows to 90° with relaxed shoulders
- Forearms indicate ideal table height
Rule of thumb: Table height = seat height + 28-30 cm
Solutions for tables that are not height-adjustable
A fixed desk is not compatible with an ergonomic office chair .
Table too high (most common case):
- Adjust the chair to a higher position.
- Footrest is mandatory (not optional!)
- Minimum requirements: height-adjustable, non-slip, 45×35 cm
Legal notice: According to the German Workplace Ordinance (ArbStättV), the employer must provide a footrest .
Table too low:
- Use tabletop displays
- Ideally, purchase a height-adjustable desk.
Different usage scenarios
Home office : Dining tables usually 72-76 cm wide → Chair with corresponding adjustment range
Office: Standard tables 72 cm → Chair with a seat height of at least 50 cm
Conference room: Large adjustment range needed (40-55 cm) for different users
FAQ
What seat height is best for a person who is 170 cm tall?
43-46 cm as a starting range. 25% formula: 170 × 0.25 = 42.5 cm. Crucial: practical test with feet flat on the floor.
What to do if the table is too high or too low?
Table too high: chair higher + footrest.
Table too low: Buy table risers or a height-adjustable table.
Why do my legs fall asleep despite the "correct" posture?
Most common causes: seat height too high, seat depth too long, sitting for too long without breaks.
