Office chairs

Is a Weight Rating Enough When Choosing a Big-and-Tall Office Chair?

Published · By Ergocrew · Specs and guidance as of that date, from the pages under Sources

Summary

No. A weight rating is the manufacturer's upper limit for the load, and you should stay under it, but it says nothing about whether the seat is wide or long enough for you. OSHA's chair guidance treats size as its own requirement: seats should be "wide enough to accommodate the majority of hip sizes," and "Chairs with oversize seat pans should be provided for larger users." Compare the seat, the armrest spacing and the backrest against your own measurements, then check the chair against the desk.

Seat width and depth

Measure across your hips while seated and add room to shift position. The seat width on the listing should be larger than that, measured between the armrests as well as across the cushion, because on some chairs the arms sit inside the edge of the seat.

Depth matters for tall users as much as width does for broad ones. OSHA notes that a seat pan that is too short "can place excess pressure on the buttocks of taller users," and asks for a seat pan that is "'depth' adjustable to adequately support taller users while allowing shorter users to sit with their back fully supported." A seat slider does both jobs.

Armrest spacing and backrest height

Armrests should be "Wide enough to allow easy entrance and exit from the chair" but still close enough to support your forearms with your elbows near your sides. On a big-and-tall chair with fixed arms, the space between them is a hard limit. Width-adjustable arms, or arms that flip up, avoid that.

A taller back helps when you lean back or want head support, but a tall backrest can still put the lumbar curve too low for a tall user. Check the lumbar height range, not just the overall back height.

What the weight rating does and does not cover

Follow the stated capacity as a limit, and read the product page for what it applies to, such as the whole chair or a specific base or gas cylinder. A chair can carry a high rating and still have a seat too narrow for you, because the two numbers measure different things. For the base itself, OSHA calls for "a strong, five-legged base" and casters that suit the floor.

The desk has to fit the bigger chair

Wide seats and thick armrests collide with desk legs, drawer units and keyboard trays. Measure the clear width between the desk legs and the height under the desktop; OSHA gives 20 to 28 inches (50 to 72 cm) as the general leg-clearance height. If the arms will not pass under the desk, you end up sitting farther from the keyboard than the chair's fit would suggest.

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Related guides

Sources

  1. OSHA Computer Workstations eTool, Chairs
  2. OSHA Computer Workstations eTool, Desks

We have not tested these products. Specs and guidance are as published on these pages on the date above and can change; the manufacturer's page for your model has the current details.

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