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Use this calculator to estimate seat height, desk-to-seat drop, and adjustment range for healthier seated posture. It helps reduce lower-back, hip, and knee discomfort caused by poor chair setup.
Last updated: April 7, 2026
Need a full ergonomic setup? Browse all tools
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.
Starts from lower-leg length and footwear so feet can remain supported on floor or footrest.
Shows vertical difference between desk and seat to guide elbow and shoulder positioning.
Provides a narrow range so you can test comfort without over-adjusting every variable at once.
For lower leg 18 in, shoe sole 1 in, desk 29 in: seat height ~19.0 in, desk-to-seat drop ~10.0 in.
Seat Height
19.0 in
Desk-Seat Drop
10.0 in
Footrest Need
Possible
This calculator estimates seat height from lower-leg length plus shoe allowance. It then compares seat height to desk height to show vertical drop and identify whether your setup may require a footrest.
Seat Height: Lower Leg Length + Shoe Sole HeightDesk-to-Seat Drop: Desk Height - Seat HeightAdjustment Range: Seat Height ± 1.5 cm (or equivalent)Want better full-body desk ergonomics? Combine this with monitor and standing desk height calculators.
Explore Accessibility & Ergonomics CalculatorsResult: Start at 19 in seat height and tune by comfort within a small range.
Re-check once keyboard, armrests, and monitor are finalized.
Share it with teammates setting up more comfortable office workstations.
Suggested hashtags: #Ergonomics #OfficeChair #Posture #Workspace #Accessibility