Most desk calculators hand you four numbers. This one hands you a scale section drawing of your own setup — seat, desk, monitor and sightline — with every dimension shown as the range it actually is, and your gaze angle checked live against OSHA’s guidance. Move any control and the drawing redraws.
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Every figure is a band with a target mark. The ergonomics literature supports ranges; publishing a single number would invent a precision the evidence does not have.
OSHA puts the screen centre 15–20° below horizontal eye level. The wedge on the drawing is that window, and the solid line is where your setup actually points.
A monitor resting straight on a desk usually sits too low. The lift figure is the gap a riser or arm has to close — the geometry produces it, we are not talking you into it.
The desk-height formulas are linear fits to adult data and drift below 5′0″ and above 6′6″. The page says so on screen when you get there rather than quietly returning a bad number.