Office-chair comfort depends on the relationship between the chair, your body and the desk. Two chairs with similar overall dimensions can feel very different because their adjustment ranges and seat shapes differ.
Seat height is the first check
Look at the stated minimum and maximum seat height. You want a position where your feet can be supported and your working height makes sense with the desk.
Seat depth affects leg support
A deep seat can support more of the thigh but may press behind the knees of a shorter user. A shallow seat can feel less supportive to a taller user. Adjustable seat depth is useful where several people share the chair, but many chairs have a fixed seat pan.
Check armrests against the desk
Fixed arms can stop a chair sliding beneath a desk. Measure the desk’s clear underside height and compare it with the arm height at the position you expect to use. Fold-up or height-adjustable arms can make this easier.
Backrest and headrest adjustment
A high back is not automatically better. Check which parts actually adjust and whether lumbar or head support can be positioned to suit you.
Allow room for the base
A five-star castor base can be wider than the seat. Measure the floor area around the desk, especially if the chair sits between cabinets or close to a wall.
Browse our office chairs to compare the adjustment features and dimensions manufacturers actually publish.