15.6″ / 17″ Full HD @ 125% viewport size

1536 × 864CSS px · 1.25× DPR · 1920×1080 physical

By default the 15.6″ / 17″ Full HD @ 125% gives a full-screen web page a 1536 × 864 CSS pixel viewport, drawn on a 1920 × 1080 pixel panel (device pixel ratio 1.25). That’s the size your media queries see, and it changes if the owner picks a different scaling option (listed below).

CSS viewport (portrait)1536 × 864what web pages get

Aspect ratio16:9width : height

Device pixel ratio1.25×1 CSS px = 1.25 × 1.25 screen pixels

Physical resolution1920 × 108015.6″ screen

Visible in the browser1536 × 729Chrome (Windows 11), first load

Released–Windows laptop

See your site on a 15.6″ / 17″ Full HD @ 125%

Paste your address (or localhost:3000). doesitfit shows it at exactly 1536 × 864, with Chrome (Windows 11)’s bars if you want them, and tells you if anything spills.

Free, no sign-up. Or ask Claude, ChatGPT or Codex to check it.

What a web page actually sees

The full viewport is 1536 × 864, but the browser’s own bars take some of it. In Chrome (Windows 11) a page gets about 1536 × 729 on first load (Chrome’s 87px tab strip + toolbar and the 48px Windows 11 taskbar, maximized window). That’s your real “above the fold”.

Setting	Width	Height
Full viewport	1536px	864px
Visible on first load (Chrome (Windows 11))	1536px	729px

What it means for your CSS

Breakpoints

At 1536px: Tailwind uses 2xl (sm: md: lg: xl: 2xl: styles apply); Bootstrap uses xxl.

Tailwind breakpoints on real devices

Content width

With 16px of padding on each side your text column is 1504px; with 24px it’s 1488px. Text closer than 8px to the edge looks cramped (more).

Sharp images

A full-width image needs about 1920px of real pixels (1536 × 1.25).

<img src="hero-1920.jpg"
  srcset="hero-800.jpg 800w, hero-1920.jpg 1920w"
  sizes="100vw" alt="…">

Styles for this width

Content-first breakpoints beat device lists, but if something breaks at this width:

@media (max-width: 1536px) {
  /* screens 1536px wide and narrower */
}

Other display size settings

The scaling the owner picks changes the viewport your site gets:

Setting	CSS viewport	DPR
Default 125% (default)	1536 × 864	1.25
100%	1920 × 1080	1
150%	1280 × 720	1.5

How common is 1536 × 864?

1536 × 864 is the #2 most common desktop screen size worldwide, with 6.75% of desktop traffic (Aug 2026, StatCounter).

Same viewport:

Chromebook 13–14″ Full HD

Compare:

Everything about the 1536 × 864 viewport · All devices 1536px wide · All Windows laptops sizes

Questions people ask

What is the viewport size of the 15.6″ / 17″ Full HD @ 125%?

1536 × 864 CSS pixels, with a device pixel ratio of 1.25. The screen itself is 1920 × 1080 physical pixels.

How much of the 15.6″ / 17″ Full HD @ 125% screen does a web page get in Chrome?

About 1536 × 729 on first load: the Chrome’s 87px tab strip + toolbar and the 48px Windows 11 taskbar, maximized window. Design your first screen for that height, not the full 864px.

Which CSS breakpoint does the 15.6″ / 17″ Full HD @ 125% fall into?

At 1536px wide, Tailwind CSS uses 2xl (sm: md: lg: xl: 2xl: styles apply) and Bootstrap uses its xxl tier.

How wide should images be for the 15.6″ / 17″ Full HD @ 125%?

A full-width image needs about 1920px of real pixels (1536 CSS px × DPR 1.25) to look sharp. Use srcset so smaller screens don’t download it.

How can I test my website on a 15.6″ / 17″ Full HD @ 125% without one?

Open doesitfit.lol, paste your address (localhost works too) and pick the 15.6″ / 17″ Full HD @ 125%. It shows your site at exactly 1536 × 864 CSS pixels and flags anything that spills past the edge.

Guides that help

About these numbers

Confidence: High: confirmed by more than one independent source. Windows picks a “recommended” scale per panel and manufacturers often override it; Chrome rounds fractional sizes up (2560×1600 at 150% → 1707×1067).

Sources include DeviceAtlas, Chrome DevTools device list (EmulatedDevices.ts), iosref.com, ios-resolution.com. Researched September 2026.