Monitor height and distance: the numbers, with worked examples

Set your monitor so the top of the screen is at or slightly below eye level, and place it 20 to 40 inches (50 to 100 cm) from your eyes, straight in front of you ^[1]. OSHA also states that the center of the screen should sit about 15 to 20 degrees below your horizontal line of sight ^[1]. Cornell's version is similar: your eyes line up with a point about 2 to 3 inches below the top of the screen casing, the center about 17 to 18 degrees below horizontal, and the distance roughly arm's length ^[2].

The rest of this page shows how to measure those numbers on your own desk and what to do when your monitor or your body does not fit the defaults.

How do you set monitor height in five steps?

1. Sit the way you work, with your feet on the floor and your back against the chair. Don't straighten up for the measurement.
2. Look straight ahead and note where your eyes land. Measure from the desk surface up to your eye level. This is your eye height above the desk.
3. Set the distance. Stretch an arm toward the screen and adjust until your fingertips reach the glass. OSHA's range is 20 to 40 inches (50 to 100 cm), so arm's length sits inside it for most adults ^[1][2].
4. Raise or lower the monitor until the top edge is at or slightly below your eye height. On a monitor with a fixed stand, use a sturdy stack of books or a monitor riser. A monitor arm gives you finer control.
5. Tilt the screen so it faces you squarely, no more than 10 to 20 degrees back, and keep it perpendicular to windows to cut glare ^[1].

The monitor height calculator does the arithmetic from your eye height and distance.

What does the geometry look like?

OSHA's 15 to 20 degrees below horizontal is a rule about the center of the screen. The vertical drop from your eyes to the center equals the distance multiplied by the tangent of the angle. At a given distance, the center of the screen should sit roughly this far below your eyes:

To turn that into a top-of-screen height, subtract half the screen height. On a 24-inch 16:9 monitor (about 11.8 inches tall), the top edge lands roughly 0.5 to 2.8 inches below eye level at 24 inches away. On a 27-inch 16:9 monitor (about 13.2 inches tall), the top edge lands at roughly eye level to about 2 inches below it. Those results match the "top at or slightly below eye level" rule, which is a useful check on the arithmetic. Screen dimensions here are approximate, so measure yours.

Why is your monitor too low or too high?

A monitor on its stock stand often ends up lower than the numbers above call for, so check yours. A low screen makes you look down, which flexes your neck. A screen set too high has its own cost: OSHA's guidance says the top should not sit above your line of sight, to limit how far you tilt your head back ^[1].

Check from your normal working position. If you catch yourself tipping your head down or back, or pushing your chin out to read, the height or the distance is off.

What if you wear glasses or bifocals?

OSHA says bifocal wearers may need the monitor lower than the standard recommendation to avoid tilting their head backward, sometimes with a change in chair height and a footrest ^[1]. If you wear progressive lenses, ask your eye-care provider whether you need a pair set for your computer distance, so you are not bending your setup around your glasses.

What about two monitors?

OSHA recommends placing the monitor directly in front of you, no more than 35 degrees to either side, so your head, neck, and torso face forward ^[1]. With two monitors, put the one you look at most directly in front, angle the second toward you, and keep both at the same height. If you use both equally, center the gap between them in front of you. Turning your head for hours to one side is worth avoiding.

What about a laptop screen?

A laptop flat on a desk puts the top of the screen well below eye level. In a motion-capture study of 30 people, seated laptop use added about 11 degrees of neck flexion compared with seated desktop use ^[4]. The remedy is to raise the laptop and use a separate keyboard and mouse. The laptop stand height calculator gives you the height, and the laptop ergonomics guide covers the setup. Ten students in one experiment had lower calculated neck torque and lower perceived neck strain on an ergonomic laptop station than on a standard laptop over four hours ^[6].

If you connect a laptop to an external monitor, close the laptop lid or move the laptop off to the side. Using its low screen as a second display for long reading brings the same downward gaze back.

What if you stand at your desk?

Standing does not change the geometry. Your eyes are still the reference point. In the same motion-capture study, seated and standing desktop use showed no meaningful posture differences ^[4]. Recalculate from your standing eye height, and use the standing desk height calculator to set the desk.

What does research say about the exact height?

Less than the confident advice online suggests. Ten intermediate-level computer users in one lab study worked with the monitor at 15, 30, and 45 degrees below horizontal. Neck muscle activity did not differ significantly across the three heights, but the highest position, 15 degrees below horizontal, was rated significantly higher for neck and lower-back comfort and was more acceptable to users ^[3]. That fits the guidance to keep the screen high enough to avoid looking down, but ten people over a short session cannot tell you about years of work.

No monitor position will remove the need to move. OSHA says staying in one posture or sitting still for long periods is not healthy ^[5], and Cornell suggests looking away from the screen for a minute or two about every 15 minutes ^[2]. The chin tuck is a quick position reset between tasks.

How can you check your monitor position?

Take a side photo while you work and look at whether your head sits over your shoulders and whether your eyes point slightly down at the screen. The free webcam check at /posture-check/ records a sitting-tall reference and then compares your working position against it. It runs in your browser and does not send video anywhere. Use the desk setup checklist to check the rest of your desk.

If you have neck pain that lasts more than a few weeks, spreads down an arm, or comes with numbness or weakness, see a clinician. The when-to-see-someone guide lists urgent warning signs.