How the monitor height calculator works
The target: top of screen at (or slightly below) eye level
A neutral gaze drops 15–20° below horizontal — so the top edge of the screen sits at or ~2–3 cm below eye height, and your eyes rest on the upper-third content area (where browsers and editors put the action). The calculator converts your measured eye height and desk height into a riser height for the monitor's bottom edge, using your screen's actual dimensions.
Distance follows screen size
Comfortable viewing distance ≈ arm's length, scaling with the diagonal: roughly 50–60 cm for 24", 60–75 cm for 27–32". Too close forces constant eye refocusing; too far makes you lean in (defeating the whole height project). Portrait orientation raises the effective top edge — the calculator accounts for it, and for the famous laptop exception: a laptop screen used alone is always wrong for the neck (see the desk calculator FAQ).
Bifocals and progressives change everything
Progressive lenses are optimized for a specific gaze zone; screens placed "correctly" for neutral gaze force wearers to tilt the head back and peer through the intermediate band. The standard fix: lower the monitor 3–5 cm and tilt it up slightly — or better, ask the optician for a screen-height-optimized fitting. The calculator adjusts for this explicitly.
Two monitors
If usage is balanced (50/50): center the seam at the midline. If one dominates: center the primary, park the secondary at the same height, angled ~15–20° toward you at the same top-edge line. Height mismatch between duals is the classic neck-rotation generator — match the tops.