Buying a monitor should be simple and is not. Listings are dense with specifications — 27-inch, 2560×1440, IPS, 165Hz, 1ms, HDR400, 99% sRGB — each presented as a selling point and none explained.
The awkward part is that the right monitor depends almost entirely on what you do with it. The specification that matters most for one use is irrelevant for another. A superb gaming monitor can be a poor choice for photo editing.
This guide explains what each specification does, which matter for which purposes, and how to arrive at a sensible choice.
Size and resolution belong together
These are often considered separately and should not be. What matters is the relationship: how many pixels are packed into each inch.
Too few for the size and text looks coarse. Too many and everything is tiny unless you scale it.
Size
Comfortable resolution
22–24 inch
1920×1080 (Full HD)
27 inch
2560×1440 (QHD)
32 inch
1440p or 3840×2160 (4K)
34 inch ultrawide
3440×1440
A 27-inch at 1080p is the most common mismatch. It works, but text looks noticeably soft next to the same resolution on a 24-inch panel.
4K at 27 inches is very sharp but usually needs scaling to make text readable. macOS handles scaling well; Windows handles it well now, with occasional trouble in older applications.
Panel type: the specification that affects you most
IPS gives the best colour accuracy and the widest viewing angles — colours stay consistent from the side. This is the default recommendation and essentially mandatory for colour-critical work. Modern IPS panels are fast enough for most gaming.
VA gives much better contrast and deeper blacks, which suits films. Viewing angles are narrower and dark fast-moving scenes can smear.
TN is fast and cheap with poor colour and poor angles. Now mostly confined to budget and competitive-gaming panels.
OLED monitors offer perfect blacks and very fast response, at a high price, with burn-in worth considering on a screen showing a fixed taskbar all day.
For most buyers: IPS. For films in a dark room: consider VA.
Refresh rate
60Hz — standard, fine for office work and video
75Hz — a small, cheap improvement
100–144Hz — noticeably smoother, the gaming standard
165Hz+ — competitive gaming specifically
The jump from 60Hz to 120 or 144Hz is very noticeable in scrolling and games. Beyond that, returns fall away quickly.
Your computer must actually produce frames at that rate. Buying a 165Hz monitor for a machine managing 45fps spends money on nothing.
Response time and the “1ms” claim
Manufacturers quote response time in ways that are close to meaningless — usually a best-case transition with overdrive settings that introduce visible artefacts. Treat it as a rough indicator. Any modern IPS panel is fast enough unless you compete seriously.
Variable refresh rate
FreeSync and G-Sync match the monitor’s refresh rate to the frames your computer produces, eliminating tearing without the input lag of traditional vertical sync. For gaming this is genuinely worth having, and for many people it improves things more than a higher refresh rate does.
Brightness, contrast and HDR
Brightness in nits: 250–300 is adequate indoors, 400+ helps in a bright room — worth considering with strong daylight.
Contrast ratio is where VA leads. Ignore “dynamic contrast” figures.
HDR is where specifications become misleading. Entry-level HDR badges are applied to monitors that cannot produce meaningfully better highlights, and enabling it often looks worse than leaving it off. Real HDR needs high peak brightness and local dimming, which costs considerably more. If it matters, look for a high certification tier and read a review.
Colour accuracy
Relevant for photo, video and design work. Look for coverage percentages: sRGB for general and web work, DCI-P3 for video, Adobe RGB for print. 99% sRGB is a reasonable general target. Professional work needs a panel that can be hardware-calibrated.
Ports
HDMI is universal — check the version, since older ones limit resolution and refresh combinations. DisplayPort generally supports more bandwidth. USB-C can carry video, data and power over one cable, which is genuinely convenient with a laptop; confirm it delivers enough wattage to charge yours. A built-in USB hub is a small convenience that becomes a large one daily.
Ergonomics, which people ignore and then regret
A monitor used for eight hours a day should be at a comfortable height, and most included stands adjust only in tilt.
Look for height adjustment, or VESA mounting so you can fit an arm later. A screen too low causes neck strain that no specification list mentions.
Matching monitor to use
Office and study: 24–27 inch, 1080p or 1440p, IPS, 60–100Hz, height-adjustable.
Gaming: 27 inch, 1440p, IPS, 144Hz+, FreeSync or G-Sync, matched to your graphics card.
Photo and video editing: IPS, high sRGB coverage, 27 inch or larger. Colour over refresh rate.
Programming: screen area matters most — 27-inch 1440p, two monitors, or a 34-inch ultrawide.
Films: VA for contrast, OLED if the budget allows.
Practical buying notes
See it in person if you can, since panel uniformity and backlight bleed vary between units of the same model. Check the warranty and dead-pixel policy. Be wary of very cheap unbranded panels, where the savings usually come from poor uniformity and inaccurate colour no setting will fix. Use a surge protector on anything permanently plugged in. And note that two smaller monitors often beat one large one for productivity, frequently for less money.
The short version
Match size to resolution — 24 inch at 1080p, 27 inch at 1440p — and choose IPS unless you have a specific reason not to.
Refresh rate matters for gaming and scrolling and nothing else, and only if your computer can produce the frames. Ignore the 1ms and entry-level HDR claims.
Insist on height adjustment or VESA mounting. The monitor you look at all day deserves more attention than the numbers on the box suggest.
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