24" Full HD vs 27" QHD

The 27-inch 1440p gives you 27% more screen area and 17 more pixels per inch.

Dimensions and density

	24" Full HD	27" QHD
Resolution	1920 × 1080	2560 × 1440
Width	20.9 in (53.1 cm)	23.5 in (59.8 cm)
Height	11.8 in (29.9 cm)	13.2 in (33.6 cm)
Screen area	246 in²	312 in² (+27%)
Pixel density	92 PPI	109 PPI
Pixel pitch	0.277 mm	0.233 mm
60 PPD distance	37.5 in (95.1 cm)	31.6 in (80.3 cm)

The 27-inch 1440p is the clearly sharper panel at 109 PPI (pixel pitch 0.233 mm). Past roughly 140 PPI you will want OS scaling; around 110 PPI works unscaled. Enter your own viewing distance in the calculator to see pixels per degree, the measure that decides what your eyes actually resolve.

Desk distance

The 24-inch 1080p reaches the 60 central pixels-per-degree reference at 37.5 in (95.1 cm) and the 27-inch 1440p at 31.6 in (80.3 cm). Use the PPD calculator to compare angular pixel density at your own distance. These reference distances do not guarantee that pixels or resolution differences become invisible.

Decided? See current prices for 24-inch 1080p and 27-inch 1440p monitors on Amazon.

Open this comparison in the calculator, drawn to scale

Reading this on an iPhone? Open it in the calculator and tap "Setup on your wall" to see the screens in your room at true physical size, in augmented reality.

Common questions

Is a 27-inch 1440p monitor better than a 24-inch 1080p?

For screen space: the 27-inch 1440p has 27% more area. For sharpness: 109 PPI against 92. Which wins depends on your distance and use; the numbers above make the trade-off concrete.

What is the PPI of a 27-inch 1440p monitor?

2560 by 1440 pixels across a 27-inch diagonal gives 109 pixels per inch, a pixel pitch of 0.233 mm.

How these measurements are calculated

For a diagonal d and aspect ratio w:h, screen width is d × w / √(w² + h²), and height is d × h / √(w² + h²). Area is width × height; PPI is √(horizontal pixels² + vertical pixels²) / diagonal in inches. Results are rounded for display.

Screen dimensions exclude the frame, feet and stand. Check the manufacturer's measurements for furniture and mounting clearance. A flat-screen viewing angle is 2 × atan(width / (2 × eye-to-screen distance)). The 40° cinema target is a preference, not a requirement; adjust the viewing angle for your room. It is approximately equivalent, for a 16:9 screen, to the distance × 0.835 sizing rule in the THX viewing guide.

The 60 central pixels-per-degree reference is a rule of thumb, not a guarantee that two displays look identical. Eyesight, contrast, source quality and panel technology also matter. Check sharpness at your own viewing distance.

Every number on this page is computed from resolution and diagonal with the DisplayMath screen size calculator. Free, no signup, runs in your browser. Content updated 2026-09-09. Feedback? Email hello@displaymath.com or find us on Instagram. About · Privacy and affiliate disclosure. © 2026 DisplayMath. All rights reserved.