21.5 vs 23.8 Inch Monitor
A 23.8 inch monitor has 23% more screen area than a 21.5 inch. It is 2.0 in (5.1 cm) wider and 1.1 in (2.9 cm) taller.
How do the 21.5 and 23.8 inch screens compare?
Screen sizes only. Frames and stands add a little, and you can see them on each size page.
On a desk, the 23.8 inch is about two inches wider and about an inch taller than the 21.5 inch. In screen area, that is a clear step up.
Which is sharper at the same resolution?
The same pixels look sharper on the smaller screen.
The percentage is the Windows scaling each needs for readable text.
Both look clear at 1920 × 1080, crisp at 2560 × 1440 and very sharp at 3840 × 2160. Neither screen moves into a different band at any resolution, so the gap is small in practice.
Windows scaling differs at 2560 × 1440 (150% against 125%) and 3840 × 2160 (225% against 200%), with the 21.5 inch first.
How far should you sit from each?
Sit 25.7 in65.4 cm to 35.0 in88.8 cm from the 21.5 inch, and 28.5 in72.4 cm to 38.7 in98.3 cm from the 23.8 inch. In that range the screen fills 30 to 40 degrees of your view.
At 28 in71 cm, the 21.5 inch feels ideal while the 23.8 inch feels wide. Elsewhere in the table they feel the same.
How wide is a dual 21.5 or 23.8 inch setup?
Two 21.5 inch screens side by side span 37.5 in (95.2 cm) of glass, and two 23.8 inch screens span 41.5 in (105.4 cm). Add both frames from the maker's spec sheet before you measure your desk.
From 24 in (61 cm), the 21.5 inch pair fills 76° of your view and the 23.8 inch pair 82°. Angle both screens in toward you so the outer edges face your eyes.
Two 21.5 inch screens are a little wider than one 38 inch ultrawide, with a frame down the middle. Two 23.8 inch screens are about as wide as one 45 inch ultrawide, with a frame down the middle.
Which should you buy?
It depends on your desk and what you do. These picks follow the numbers above.
What do real 21.5 and 23.8 inch monitors measure?
We list five 21.5 inch models, from BenQ and AOC, and nine at 23.8 inch, from ASUS and AOC. AOC makes both sizes here, so you can stay with one maker.
The lightest 21.5 inch is the AOC 22B30HM2 at 3.95 lb1.8 kg, and the lightest 23.8 inch is the AOC 24B30H3 at 4.87 lb2.2 kg. Off their stands, the thinnest are the AOC 22B30HM2 at 1.4 in3.6 cm and the AOC 24B30H3 at 1.4 in3.5 cm. An arm rated for 8 lb3.6 kg or more holds any of them, the ASUS VA24DQ included.
Desk depth on their stands runs 6.7 to 6.9 in17.0 to 17.5 cm for the 21.5 inch and 6.8 to 8.1 in17.4 to 20.5 cm for the 23.8 inch. Every model at both sizes uses 100 x 100 mm VESA, so one arm fits either.
Shop 21.5 and 23.8 inch monitors
Affiliate linksMore questions about 21.5 and 23.8 inch monitors
Is upgrading from a 21.5 to a 23.8 inch monitor worth it?
You get 23% more screen area. At the same resolution you see the same content, only bigger. For more room for windows, pair the bigger screen with more pixels.
Is 23.8 inch too big for a desk?
Not if you can sit 28.5 in (72.4 cm) or more from it. Closer than that, the screen fills more than 40° of your view and you turn your head to see the edges.
Should a 21.5 or 23.8 inch monitor be 1440p or 4K?
At 1440 pixels tall, the 21.5 inch gives 137 PPI and the 23.8 inch gives 123 PPI. 4K looks sharper on both, but needs 150% scaling or more on Windows.
How much desk width does each need?
The 21.5 inch screen is 18.7 in (47.6 cm) wide and the 23.8 inch is 20.7 in (52.7 cm). Add the frame width from the maker's spec sheet.
How we measure
Width and height come from each diagonal and aspect ratio. Pixel density is the pixel diagonal divided by the screen diagonal. The comfortable distance keeps the screen between 30 and 40 degrees of your view.