Home Office Ergonomics: A Practical Setup Guide
How to set up a chair, desk, screen and laptop using what workplace safety agencies recommend, a simple measurement for screen height, and which changes to make first on a small budget.
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The kitchen table was meant to be temporary. A year later you are still working on it, with the laptop flat on the table, your neck bent forward and a cushion behind your back that keeps sliding off. For an employee, an employer is often expected to check the workstation. As a freelancer, that job is yours.
This guide sets out what workplace safety agencies recommend, shows why a laptop on its own is usually the biggest problem, and gives an order for fixing things when money is limited.
In brief
- The US Occupational Safety and Health Administration (OSHA) suggests a screen at least 20 inches (about 50 cm) away, with the top line at or below eye level and the centre of the screen normally 15 to 20 degrees below horizontal eye level.
- The UK Health and Safety Executive (HSE) suggests the keyboard just below elbow height, the mouse in line with the elbow, and the screen and keyboard straight in front of you so you do not twist.
- In our worked example, a laptop flat on a desk puts the centre of the screen about 30 degrees below eye level. Raising it 15 cm on a stand brings it to about 18 degrees, inside OSHA's range.
- A laptop needs a separate keyboard and mouse before it can be raised, which the HSE also suggests.
- For breaks, the HSE says short, frequent breaks are better than long, rare ones, and the American Academy of Ophthalmology suggests the 20-20-20 rule for eye strain.
What ergonomics means here#
Arranging your chair, desk, screen, keyboard, mouse and lighting to fit your body and your work, so you can keep a comfortable, neutral posture and change position through the day.
The guidance below comes from occupational safety agencies and an eye-care professional body. It describes general setup, not treatment. If you already have pain, numbness or eye problems, a doctor or other health professional is the right person to advise you.
The problem#
Home workspaces are usually improvised. Dining chairs have no adjustment, tables are a fixed height, and laptops put the screen and keyboard in one place, so one of them usually ends up in the wrong position. According to OSHA's workstation guidance, a screen placed too high pushes the head, neck, shoulders and back into awkward postures, and holding those for long periods tires the muscles that support the head.
Freelancers also tend to work long, uneven hours around deadlines, which makes a poor setup harder to ignore.
Why it is harder than it looks#
- Bodies differ. A setup that fits one person can be wrong for another at the same desk.
- Laptops force a trade-off. If the keyboard is at the right height, the screen is too low. If the screen is at the right height, the keyboard is too high.
- Agencies phrase things differently. OSHA says the top of the screen should be at or below eye level. The HSE says level with the eyes. Both are pointing at the same zone, so aim for the top of the screen at or slightly below eye height.
- Posture is not a single position. Guidance from the HSE stresses moving and changing posture as well as setting things up once.
What most advice leaves out#
Most ergonomics articles are shopping lists. A good chair and a monitor arm can help, but they do not fix a laptop flat on the table, and that single change often matters more than anything you buy. The other common gap is that advice rarely gives a way to check your setup. The angle below is one simple check you can do with a tape measure.
The plot: how far below your eyes the screen sits#
To show the laptop problem, we worked through one example. The measurements are illustrative, for a person whose eyes are 120 cm above the floor when seated, at a 74 cm desk, looking at a 14-inch laptop screen from 60 cm away. The centre of that screen sits about 11 cm above the desk surface.
The angle is calculated as the arctangent of (height of the eyes above the screen centre ÷ viewing distance).
Our calculation using illustrative body and desk measurements. OSHA suggests the screen centre normally sits 15 to 20 degrees below horizontal eye level. Your numbers will differ, so measure your own.
| Setup | Screen centre below eye level | Angle | Top of screen below eye level |
|---|---|---|---|
| Flat on the desk | 35 cm | 30.3 degrees | 26 cm |
| On a 10 cm stack of books | 25 cm | 22.6 degrees | 16 cm |
| On a 15 cm stand | 20 cm | 18.4 degrees | 11 cm |
| On a 20 cm stand | 15 cm | 14.0 degrees | 6 cm |
In this example, a 15 cm lift brings the screen into OSHA's range. A 20 cm lift puts the top of the screen close to eye level, which is nearer the HSE's wording but slightly outside OSHA's angle. The point is not an exact number: it is that the laptop flat on the desk is well outside both, and a raise of 10 to 20 cm moves it most of the way.
To check your own setup, measure the height of your eyes and of the screen centre from the floor while seated, and the distance from your eyes to the screen. Divide the height difference by the distance. A result between about 0.27 and 0.36 corresponds to 15 to 20 degrees.
What the agencies recommend#
| Part | Guidance | Source |
|---|---|---|
| Screen distance | At least 20 inches (50 cm); preferred 20 to 40 inches (50 to 100 cm) | OSHA |
| Screen height | Top line at or below eye level; centre 15 to 20 degrees below | OSHA |
| Screen position | Directly in front of you, about an arm's length away | OSHA, HSE |
| Keyboard | Just below elbow height, central, so you do not twist | HSE |
| Mouse | In line with the elbow | HSE |
| Seat | Height supports the front and back of the thighs equally; 2 to 3 cm gap between the seat edge and the back of the knee | HSE |
| Lower back | Seat back gives good lower-back support, or add a cushion | HSE |
| Shoulders | Relaxed; sit high enough that you do not shrug | HSE |
| Laptops | Separate keyboard and mouse so the screen can be raised on a riser | HSE |
| Breaks | Short and frequent, such as 5 to 10 minutes every hour, rather than 20 minutes every 2 hours | HSE |
| Eyes | Every 20 minutes, look at something at least 20 feet away for at least 20 seconds | American Academy of Ophthalmology |
The HSE also notes that there is no legal rule on how long or how often breaks should be for screen work, and that it depends on the job.
A strategy for deciding what to fix first#
- Screen height and distance first. With a laptop, that means a stand or a stable stack of books, plus a separate keyboard and mouse.
- Then the keyboard and mouse height. If the desk is too high for your elbows, raise the chair and support your feet on a footrest or a firm box.
- Then the chair. Add a cushion for lower-back support or seat height before buying a new one, and see whether it is enough.
- Then light and glare. Move the screen so windows are to the side, not behind it or behind you.
- Then habits. Breaks and changes of position cost nothing and apply to every setup.
Step-by-step solution#
- Sit at your usual spot and measure the numbers in the check above.
- Raise the screen until its centre sits roughly 15 to 20 degrees below your eyes and the top is at or just below eye level.
- Add a separate keyboard and mouse if you use a laptop, and place them just below elbow height, straight in front of you.
- Set the chair height so your thighs are supported evenly and your shoulders stay relaxed. Use a footrest if your feet do not rest flat.
- Check the seat depth: a gap of 2 to 3 cm between the seat edge and the back of your knee.
- Support your lower back with the chair or a cushion.
- Adjust light to cut glare on the screen.
- Set a reminder for short breaks and the 20-20-20 rule.
- Review after a week. If something still hurts, change one thing at a time, and speak to a health professional if discomfort continues.
Common mistakes#
- Working with a laptop flat on the table for long periods
- Raising the laptop without adding a separate keyboard, so the keyboard ends up too high
- Buying an expensive chair before fixing screen height
- Setting the screen off to one side, which means twisting all day
- Placing the screen with a bright window behind it
- Sitting in one position for hours without a break
- Treating ongoing pain as a setup problem only, instead of seeing a professional
Frequently asked questions#
How high should my monitor be?
OSHA suggests the top line of the screen at or below eye level, with the centre normally 15 to 20 degrees below horizontal eye level. The UK HSE suggests the top of the screen level with your eyes, about an arm's length away.
How far away should my screen be?
OSHA suggests at least 20 inches (about 50 cm), with 20 to 40 inches generally preferred. The American Academy of Ophthalmology mentions about 25 inches, roughly arm's length.
Is a laptop stand enough?
Only with a separate keyboard and mouse. Raising the laptop moves its built-in keyboard too high to type on comfortably.
How often should I take breaks?
The HSE says short, frequent breaks are better than long, rare ones, for example 5 to 10 minutes every hour. It also says there is no legal rule on break length for screen work.
What is the 20-20-20 rule?
The American Academy of Ophthalmology suggests that every 20 minutes you look at something at least 20 feet away for at least 20 seconds, to reduce eye strain.
Sources and further reading
- OSHA: Computer Workstations eTool, Monitors — screen distance, height and viewing angle
- HSE: Working safely with display screen equipment, good posture — seat, keyboard, mouse and laptop setup
- HSE: Work routine and breaks — short, frequent breaks
- American Academy of Ophthalmology: Eye strain — the 20-20-20 rule
- American Academy of Ophthalmology: Computers, digital devices and eye strain — screen distance and glare
Educational content, not medical advice. Guidance as published by OSHA, the HSE and the American Academy of Ophthalmology as of 2026. Speak to a health professional about pain or eye problems.