Monitor size chart

The physical width and height behind every common monitor size class — so you can check desk space, monitor arms and dual-screen line-ups before you buy.

The short answer

Most desktop monitors are 16:9, so width ≈ 0.8716 × diagonal and height ≈ 0.4903 × diagonal. A 27″ monitor is 23.53 in (59.77 cm) wide; a 32″ is 27.89 in (70.84 cm) wide. Ultrawide classes break that pattern — a 34″ 21:9 panel is wider (31.36 in) but shorter than a 32″ 16:9 — which is why the chart computes every row from that class's actual resolution, not from a single ratio.

Size class	Typical resolution	Ratio	Width (in)	Height (in)	Width (cm)	Height (cm)
19″	1920 × 1080	16:9	16.56	9.31	42.06	23.66
21.5″	1920 × 1080	16:9	18.74	10.54	47.60	26.77
22″	1920 × 1080	16:9	19.17	10.79	48.70	27.40
23.8″	1920 × 1080	16:9	20.74	11.67	52.69	29.64
24″	1920 × 1080	16:9	20.92	11.77	53.13	29.89
25″	1920 × 1080	16:9	21.79	12.26	55.35	31.13
27″	2560 × 1440	16:9	23.53	13.24	59.77	33.62
28″	2560 × 1440	16:9	24.40	13.73	61.99	34.87
31.5″	3840 × 2160	16:9	27.45	15.44	69.73	39.23
32″	3840 × 2160	16:9	27.89	15.69	70.84	39.85
34″	3440 × 1440	43:18 (wide)	31.36	13.13	79.66	33.35
38″	3840 × 1600	12:5 (wide)	35.08	14.62	89.10	37.12
40″	3840 × 2160	16:9	34.86	19.61	88.55	49.81
43″	3840 × 2160	16:9	37.48	21.08	95.19	53.55
45″	3840 × 2160	16:9	39.22	22.06	99.62	56.04
49″	5120 × 1440	32:9 (wide)	47.17	13.27	119.81	33.70
57″	7680 × 2160	32:9 (wide)	54.87	15.43	139.37	39.20
65″	3840 × 2160	16:9	56.65	31.87	143.90	80.94

Widths and heights are the viewable picture, computed from the diagonal and the typical resolution for the class. “Typical resolution” means the panel most commonly sold in that size class; individual models vary (there are 1080p 27″ and 5K 27″ monitors too). For a specific model, run its resolution and diagonal through the PPI calculator, which also reports its physical size.

Reading the chart

Dual monitors: two 27″ screens side by side span about 47 in (119.5 cm) of picture before bezels and any angle between them. Check the desk, not just the diagonal.
Ultrawide swaps height for width: a 34″ ultrawide is close to a 27″ 16:9 in height (13.13 in vs 13.24 in) — it is a width upgrade, not an all-round size upgrade.
Marketing names round: a “24-inch class” monitor is often a 23.8″ panel, and “32-inch class” is often 31.5″. Both are in the chart because the difference — about half an inch of width — matters in tight multi-monitor setups.

Frequently asked questions

How wide is a 27-inch monitor in cm?

The picture is 59.77 cm wide and 33.62 cm high. The unit itself is typically 61–62 cm wide including the bezel, per manufacturer spec sheets.

Is a 34-inch ultrawide bigger than a 32-inch monitor?

Wider, yes (about 79.7 cm vs 70.8 cm of picture); taller, no (about 33.3 cm vs 39.8 cm). Its total area is actually slightly smaller. “Bigger” depends on which dimension you care about.

Why do some rows say (wide)?

Those classes use panels much wider than 16:9 — 21:9 and 32:9 families. Their simplified ratios (43:18 for 3440 × 1440, 32:9 for 5120 × 1440) are the exact fractions behind the marketing names.