The chair must support the keyboard relationship while feet and thighs remain supported.
Free chair-fit checklist
Office chair fit checker
Check whether a chair's usable adjustment ranges fit your body, desk, input devices, and tasks before relying on overall product dimensions.
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Question 1 of 6
Can you set seat height for the keyboard while keeping your feet supported?
If the desk forces the chair higher, include a stable footrest in the real setup.
Chair-fit reviewA short guided check-in.
Measure the chair in the position you will use. This educational check cannot certify fit or diagnose pain; reject a critical mismatch even when the overall score looks acceptable.
Direct answer
What this tool calculates—and what it does not.
A chair fits when its usable seat height, depth, width, backrest, lumbar, armrests, controls, and base work with the user's measurements, desk clearance, input height, tasks, and movement. Overall product dimensions or body height alone cannot establish fit.
Transparent methodology
How the calculation works
The checker assigns two points to a measured fit, one to a boundary or unresolved workaround, and zero to a mismatch or unknown. Any critical mismatch should override the total score.
Formula or decision ruleChair-fit review = sum of six measured relationship checks; maximum 12 points.
Inputs explained
Use usable dimensions in the adjusted position, not maximum external dimensions.
Controls should support representative tasks without forcing reach or raised shoulders.
Stability, movement, adjustments, desk access, duration, and return terms matter alongside measurements.
Practical use
When this tool is useful
- Comparing chair specifications before purchase.
- Checking a shared or hot-desk chair's adjustment range.
- Documenting why a chair does or does not fit a workstation.
A reliable way to use it
- 01Measure the user and desk
Record lower-leg height, supported seat depth, hip width, seated elbow height, thigh clearance, and desk clearance.
- 02Find usable chair ranges
Use the adjusted seat, back, and arms rather than packaging dimensions.
- 03Test the complete workstation
Confirm input reach, monitor view, foot support, mobility, controls, and desk access together.
- 04Record the decision
Save the fit limits, workarounds, representative tasks, response, and return or reassessment trigger.
Interpretation
How to read the result
- Treat any unsupported critical measurement as a blocker even if the total is high.
- Test the chair with the actual desk, keyboard, pointer, monitor, footwear, and representative work.
- A chair adjustment may change an exposure but cannot diagnose or treat the cause of pain.
Boundaries
What the result cannot tell you
- The checker does not certify a chair, workstation, safety program, or accommodation.
- Self-measurements and manufacturer dimensions may use different landmarks.
- Comfort during a brief test may not predict response during representative work.
- Symptoms can have causes that are not resolved by chair fit.
Common questions
Common questions about Office chair fit checker
What office chair dimensions matter most?
Usable seat-height range, seat depth and width, lumbar and backrest position, armrest range, recline and controls, base clearance, and how all of them relate to the user and desk.
Can height tell me which chair size to buy?
Height can be an initial clue, but it misses lower-leg length, thigh length, hip width, elbow height, desk clearance, task, mobility, and individual preference.
How much space should be behind the knee?
Avoid contact pressure and allow the backrest to support you. Use the chair's adjustable range and individual fit rather than one universal finger-width rule.
What if the chair must be high for a fixed desk?
If the chair is raised for keyboard height, provide stable foot support and confirm thigh clearance, monitor position, armrest clearance, and safe access.
Can the checker diagnose why my back or knee hurts?
No. It organizes workstation relationships only. Stop changes that worsen symptoms and seek appropriate care for persistent, severe, traumatic, spreading, or neurologic symptoms.
Evidence and review notes
Sources behind the method
These references support the method, boundary, or safety context. They do not turn this planning tool into individualized professional advice.
Optional next step
Follow app updates When reminders would help the habit stick
ErgoMate is the optional iOS companion for turning setup guidance and movement prompts into a repeatable workday routine.