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About this tool
Score your couch workstation, get the exact back and seat cushion depths you need, and a timed reset routine.
The Sofa Working Posture Routine scores a couch workstation against seven set-up criteria and converts the result into a maximum unbroken stint, a session split and a timed reset routine. It also solves the two problems that make a sofa a sofa: the seat is deeper than your thighs and often lower than your knees, so it calculates the thickness of the back cushion and the seat cushion you need using buttock-to-popliteal length and popliteal height from standard adult anthropometric tables. Written for people who work from a couch by circumstance rather than choice.
Open Sofa Working Posture Routine on AltFTool — it loads instantly in your browser.
Enter Your height (cm), Session length (minutes), Seat depth, front edge to backrest (cm) and Seat height when you sit on it (cm).
Under Which of these are true right now? tick the seven checks — screen top near eye level, separate keyboard and mouse, hips pushed right back, firm cushion supporting your low back, feet flat, forearms resting on something firm, standing up every 30 minutes.
Read Cushion behind your back and Firm cushion under you in cm, the Session split as stints × minutes, and run the reset routine — Stand up and walk, Chin tucks, Chest opener, Hip flexor stretch, Thoracic extension, Wrist flexor and extensor stretch.
Back and seat cushion thickness come from your body proportions rather than trial and error.
The worse your set-up scores, the shorter the recommended stint — the plan adapts instead of nagging.
Six named moves with durations that add up to a fixed reset you can run without thinking about it.
For short stretches it is manageable; as an all-day setup it is not, because a sofa gives no lumbar shape, sits too deep for most people's thighs, and puts the screen far below eye level. If it has to happen, add firm back support, get the screen up off your lap and stand up at least every 30 minutes.
Thick enough to close the gap between the sofa's seat depth and your own buttock-to-popliteal length, which is about 29% of your height — roughly 49 cm for a 170 cm person. On a 60 cm deep sofa that means an 11 cm firm cushion so your hips can sit back while your knees still clear the front edge.
This tool caps it between 15 and 45 minutes depending on how much support your set-up gives. With a lifted screen, separate keyboard, firm lumbar support and supported feet, 45 minutes is reasonable; laptop-on-lap with no support should be broken up every 15 minutes.
Cushions fix the fit of the seat, which removes one common source of strain, but they do not treat pain. If back or neck pain lasts more than a couple of weeks, wakes you at night, or comes with numbness, tingling or leg weakness, see a physiotherapist or doctor rather than adjusting the furniture again.