Desk widths, depths, and heights that actually work, plus the chair and monitor clearances people forget. Start from the table, then check the wall and floor it needs.
A desk is two measurements people get right (width and depth) and three they skip (height, monitor distance, and the chair space behind it). Get all five and the desk works for a full day. Start from the size table below, then read how much wall and floor it actually claims once you sit down.
Standard desk sizes
Width is how much surface you get; depth decides whether a monitor sits far enough away. A single monitor wants about 60 cm of depth so your eyes land 50 to 70 cm from the screen. Two monitors, or a monitor plus paperwork, want 80 cm.
| Desk | Width | Depth | Good for |
|---|---|---|---|
| Compact | 100 cm | 60 cm | A laptop, a small room, one monitor |
| Standard | 120 cm | 60 to 70 cm | The everyday desk, one monitor plus notes |
| Wide | 140 to 160 cm | 70 to 80 cm | Dual monitors, spread-out work |
| Corner / L-shape | 140 to 160 cm per leg | 60 cm per leg | Two zones, monitor plus writing |
Monitor and chair clearances
The ergonomics live in a few distances. Keep the top of the screen at or just below eye level, an arm's length away, and leave real room for the chair to roll back.
| Measurement | Target |
|---|---|
| Eye to single monitor | 50 to 70 cm |
| Top of screen | At or just below eye level |
| Desk height (seated) | 72 to 75 cm |
| Knee clearance under desk | 60 cm wide, 60 cm deep |
| Chair pull-out behind desk | 90 to 100 cm |
The chair number is the one that breaks small rooms. An office chair needs 90 to 100 cm behind the desk to roll back and stand, and that space overlaps any walkway behind you. The full room-by-room set is in furniture clearance and walkway spacing, and the 3x3 bedroom layout shows a desk and chair sharing a small room with a bed.
How much wall and floor a desk needs
Plan the desk as a zone, not a rectangle. A standard 120 cm desk against a wall claims roughly 120 cm of wall and about 150 cm of depth into the room: 60 cm for the desk plus 90 cm for the pushed-back chair. Two people back to back need that depth doubled, so about 3 m wall to wall.
- Against a wall: 120 cm wall, 150 cm deep including the chair. The tidiest use of a small room.
- Facing into the room: add a walkway behind the chair, so 60 cm desk plus 90 cm chair plus a 75 cm path.
- L-shape in a corner: fits two zones in about 160 by 160 cm, but you sit inside the L, so leave the open side clear.
- Two desks back to back: roughly 3 m of depth wall to wall, so both chairs share the middle.
Squeezing a desk into a spare corner or a shared room? The small home office layout guide walks through placing it, and the wider furniture dimensions guide has the rest of the numbers.
Common questions
- What is a standard desk size?
- A standard desk is about 120 cm wide, 60 to 70 cm deep, and 72 to 75 cm high. That fits one monitor plus space to write, at a height set for a seated elbow at roughly 90 degrees.
- How deep should a desk be for two monitors?
- About 80 cm. A single monitor is fine at 60 cm depth, giving 50 to 70 cm of viewing distance, but two monitors, or a monitor plus paperwork, need the extra 20 cm to sit far enough back.
- How much space do you need behind a desk for a chair?
- About 90 to 100 cm, so the office chair can roll back far enough to stand. In a small room that space usually overlaps the walkway behind you, so plan the two together rather than counting them twice.
- What height should a desk be?
- 72 to 75 cm for a fixed desk, set so your forearms rest level with your elbows near 90 degrees. If more than one person uses it or you alternate sitting and standing, a height-adjustable desk removes the compromise.