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Free office chair height calculator. Get seat height from lower-leg length + shoe, desk-to-seat drop, adjustment range, and footrest guidance. Then tune armrest height and monitor position.
Last updated: May 24, 2026
Feet not flat after raising chair? Footrest height calculator
Seat Height
19 in
Desk-to-Seat Drop
10 in
Suggested Seat Range
18.4 - 19.6 in
Footrest need: Unlikely
Feet should rest flat; knees near 90-100 degrees.
We can build and embed a custom version of Office Chair Height Calculator for your brand and workflow.
Answers: how high should my chair be and do I need a footrest for this desk.
Baseline so knees stay near 90ยฐ with feet supported on floor or footrest.
Relates desk height to seat for typing elbow angle โ not a second seat formula.
Flags when tall desks or high chair settings may leave feet unsupported.
Default: 18 in lower leg, 1 in shoe, 29 in desk โ seat 19 in ยท drop 10 in (25.4 cm) ยท range 18.4โ19.6 in ยท footrest Unlikely.
Seat Height
19 in
Desk-Seat Drop
10 in
Footrest
Unlikely
| Input | Method |
|---|---|
| Lower leg length | Sit barefoot (or in work shoes), measure floor to underside of knee at ~90ยฐ bend |
| Shoe sole | Heel thickness you wear at the desk โ often 0.5โ1 in (1โ2.5 cm) |
| Desk height | Top of work surface to floor โ not keyboard tray alone |
| Desk height | Notes |
|---|---|
| 27โ28 in (69โ71 cm) | Compact / vintage desks โ smaller desk-to-seat drop |
| 29โ30 in (74โ76 cm) | US standard office desk โ most common input |
| 31โ32 in (79โ81 cm) | Standing-desk seated perch or tall tables โ footrest often needed |
| Drop | Elbow posture | Footrest |
|---|---|---|
| 8โ12 in (20โ30 cm) | ~90ยฐ at keyboard | Usually Unlikely if seat set from leg length |
| 12โ13 in (~30โ33 cm) | Slightly high reach | Possible โ verify feet flat |
| >13 in (>33 cm) | Shoulders may hike | Likely โ seat raised for arms, feet dangling |
| Drop (cm) | Indicator | Meaning |
|---|---|---|
| โค28 cm | Unlikely | Typical drop at standard desk + correct seat |
| 28โ32 cm | Possible | Monitor armrest tuning may raise effective need |
| >32 cm | Likely | Add footrest or lower desk / keyboard tray |
Anthropometric seating baseline โ fine-tune by comfort and chair model limits.
seat = lowerLeg + shoeSole (converted to cm internally)deskToSeatDrop = deskHeight โ seatHeightrange = seat ยฑ 1.5 cmfootrest = dropCm >32 Likely ยท >28 Possible ยท else UnlikelySeat 19 in ยท drop 10 in (25.4 cm) ยท range 18.4โ19.6 in ยท footrest Unlikely.
Drop 25.5 cm ยท range 47โ50 cm ยท Unlikely.
Seat stays 19 in ยท drop 13 in (33 cm) ยท Likely โ add footrest or keyboard tray; do not only raise chair.
Seat 17 in ยท drop 12 in (30.5 cm) ยท Possible at 30.5 cm drop.
Drop 31.5 cm (31.5 cm internal) ยท Possible.
Drop 8 in (20.3 cm) ยท Unlikely. Watch keyboard height โ may need tray if typing surface still high.
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Suggested hashtags: #Ergonomics #OfficeChair #DeskSetup #WorkFromHome #Posture