Chair Height Calculator
Ergonomic seat, desk, and monitor heights from your height.
What it does
Desk comfort starts at seat height. Feet flat and knees near ninety set the base, and desk plus screen follow from there.
The tool above scales furniture to stature. A 69 in person suits a 17.3 in seat with a 28.3 in desk and monitor tops near 41.3 in. The metric match is 175 cm toward 43.8 cm, 71.7 cm, and 104.7 cm.
Eleven inches separate seat and desk for most bodies. That gap lands elbows near ninety degrees without hiking shoulders or drooping wrists.
Eye level sets the screen. Monitor tops near seated eye height keep necks neutral, with the top bezel at or just below the line of sight.
Bodies still judge. Shoes, cushions, and slouch drift real sitting an inch either way, so adjust after a week of afternoons.
How to use
- Pick imperial (in) or metric (cm).
- Enter height: 69 in or 175 cm suits the default.
- Read seat height first.
- Read desk height next.
- Read eye level for monitor tops.
- Sit test: feet flat, knees and elbows near 90.
Formula
- height
- Standing height.
Metric adds 27.94 cm for the desk gap and 60.96 cm for eye height, the same 11 and 24 in each way.
Worked example
Example: 69 in tall
Imperial defaults: 69 in tall. These are also the default values, so the page opens on this answer.
- Height: 69 in.
- Seat: 69 x 0.25 = 17.3 in.
- Desk: 17.3 + 11 = 28.3 in.
- Eyes: 17.3 + 24 = 41.3 in.
- Tool shows 17.3 in seat, 28.3 in desk, 41.3 in eye level.
Reference table
| Height | Seat | Desk |
|---|---|---|
| 65 in | 16.3 in seat | 27.3 in desk |
| 69 in | 17.3 in seat | 28.3 in desk |
| 72 in | 18 in seat | 29 in desk |
| 175 cm | 43.8 cm seat | 71.7 cm desk |
Limits
- Starting guide only, not medical advice.
- Cushions and shoes shift sitting.
- Fixed desks need chair and footrest tweaks.
- Pain needs professional review.
Common mistakes
- Buying chair height for desk height.
- Perching with dangling feet.
- Screens far below eye line.
- Ignoring armrest pressure on shoulders.
- One setup for very mixed users.
Try it yourself
Quick checks. Answers sit tucked under each question.
65 in tall?
Seat is 65 x 0.25 = 16.3 in. Desk is 16.3 + 11 = 27.3 in. Eyes are 16.3 + 24 = 40.3 in.
180 cm tall metric?
Seat is 180 x 0.25 = 45 cm. Desk is 45 + 27.94 = 72.9 cm. Eyes are 45 + 60.96 = 106 cm after rounding (105.96).
Questions
How high a seat?
Multiply height by 0.25. Here 69 x 0.25 = 17.3 in.
How high a desk?
Add 11 in to seat height. Here 17.3 + 11 = 28.3 in.
Monitor top height?
Add 24 in to seat height. Here 17.3 + 24 = 41.3 in from the floor.
How do I check fit?
Flat feet, knees near 90 degrees, elbows near 90 at the desk. Numbers start it, body feel finishes it.
Do shoes matter?
Yes. Shoes, cushions, and slouching shift real sitting by an inch or more.
Does this treat back pain?
No. Pain needs ergonomic review and care, not math alone.