About ChairKey

Setting up a desk usually starts with a scatter of half-answered questions. How high should the chair actually sit for your height? What desk height keeps your elbows at 90° instead of hunching your shoulders? How far back, and how high, should the monitor be? Will a standard chair actually hold your weight, or do you need a heavier-duty gas cylinder? How many minutes should you stand each hour if you’ve got a sit-stand desk? Is your seated posture actually neutral, or just close enough? None of these questions are hard on their own, but answering all of them by hand, for every part of the setup, is where a healthy workspace turns into a chore.

ChairKey exists to take that arithmetic off your plate. Instead of long guides you have to read end to end, the site is built around a set of small, single-purpose calculators, each aimed at one part of the setup. The Seat Height Calculator finds your ideal chair seat height from your body height, so your feet rest flat and your thighs stay level. The Desk Height Calculator works out the right sitting or standing desk height for your stature, keeping elbows near 90° and shoulders relaxed. The Monitor Distance Calculator works out how far back and how high your monitor should sit, from your height and screen size. The Chair Weight Capacity Checker checks whether a standard office chair suits your weight, and which gas-lift cylinder class you need. The Sit-Stand Calculator plans a healthy sit-stand balance across the working day, down to how many minutes to stand each hour. And the Posture Angle Checker checks your seated posture against the neutral 90-90-90 rule for hips, knees, and elbows.

Beyond the calculators, the blog and learn section cover chair and desk setup, posture and workspace health, and the reasoning behind the numbers the tools produce, and the Wonders & Destinations Museumis a browsable collection of the world’s landmarks, natural wonders, and cities, with every entry, image, and fact drawn from Wikipedia and Wikimedia Commons.

A few things worth stating plainly. ChairKey is an independent site, not affiliated with any chair manufacturer, furniture retailer, or ergonomics certification body. It is supported by advertising, which is how the tools stay free with no account required. Every result the tools produce — a seat height, a desk height, a monitor distance, a weight-capacity check, a sit-stand schedule, a posture angle — is a general estimate built on the numbers you enter and on common ergonomic conventions, not a professional or medical determination. For anything that involves a pre-existing condition or persistent pain, check with a qualified professional before relying on a calculator result. If something looks off in a tool or an article, or you think a calculator is missing that would help, the contact page is the place to say so.