How this instrument works
An aspect ratio describes the shape of a rectangle — width compared to height — independent of its actual size. Two panels can have wildly different pixel counts and still share the same shape, and the way to prove it is to divide both numbers by their greatest common divisor (GCD) until neither can be divided any further. What's left is the ratio in its simplest whole-number form.
16:10 is the aspect ratio used by most laptop and monitor panels marketed for productivity work, rather than pure video playback. Standard 16:10 resolutions include 1280×800 (WXGA), 1680×1050 (WSXGA+), 1920×1200 (WUXGA) and 2560×1600 (WQXGA). Compared with 16:9, a 16:10 panel is noticeably taller for the same width, which leaves more vertical room for documents, spreadsheets, code editors and web pages before you have to scroll.
Here's the detail most people miss: '16:10' itself is not written in lowest terms. The greatest common divisor of 16 and 10 is 2, so dividing both sides by 2 gives 8:5 — the true simplified ratio. Every genuine 16:10 resolution reduces to exactly 8:5 once you divide by its own GCD, which is why display enthusiasts sometimes call these panels '8:5 displays' instead.
- Enter your panel's pixel width into Width (px) — for example 1920 for a WUXGA display.
- Enter the matching pixel height into Height (px) — for example 1200.
- Read the simplified ratio directly beneath the inputs; a true 16:10 panel always reduces to 8:5.
- If your numbers reduce to something other than 8:x, your display isn't a genuine 16:10 panel — try the general Aspect Ratio instrument to identify its actual shape.
Worked example — WUXGA at 1920×1200
Enter 1920 into Width (px) and 1200 into Height (px) — the pixel grid of a WUXGA laptop or monitor panel. The greatest common divisor of 1920 and 1200 is 240, so dividing both dimensions by 240 gives a ratio width of 8 and a ratio height of 5. Simplified ratio reads 8:5.
That 8:5 figure is the true lowest-terms form of what the display industry markets as '16:10' — since gcd(16,10)=2, the marketing shorthand itself isn't fully reduced. Every other standard 16:10 panel, from 1680×1050 WSXGA+ to 2560×1600 WQXGA, reduces to that same 8:5 once you divide out its own GCD.
Questions
Why does 16:10 reduce to 8:5 instead of staying 16:10?
Because 16:10 itself isn't written in lowest terms. The greatest common divisor of 16 and 10 is 2, so dividing both sides by 2 gives 8:5 — the true simplified ratio. Any pixel grid marketed as '16:10,' like 1920×1200, reduces to 8:5 once you divide by its own GCD (240 in that case), confirming the two labels describe identical proportions.
What resolutions use the 16:10 aspect ratio?
Common 16:10 resolutions include 1280×800 (WXGA), 1440×900 (WXGA+), 1680×1050 (WSXGA+), 1920×1200 (WUXGA) and 2560×1600 (WQXGA). Every one of these reduces to 8:5 through this instrument's greatest-common-divisor method, which is a quick way to confirm a panel's marketed resolution is genuinely 16:10 rather than a rounded approximation.
Why do laptops and monitors use 16:10 instead of 16:9?
16:10 panels are taller relative to their width than 16:9 panels, giving more vertical space for documents, spreadsheets, code and web pages before you need to scroll. That extra height is why many professional laptops — including Apple's MacBook line, which has shipped 16:10 displays since the mid-2000s — favor 16:10, even though 16:9 remains dominant for television and video.
How is the simplified ratio actually calculated?
The instrument finds the greatest common divisor (GCD) of your width and height in pixels, then divides both numbers by it. For 1920×1200, the GCD is 240, so 1920÷240=8 and 1200÷240=5, giving 8:5. This always returns the smallest whole-number ratio that describes the same proportions as your original dimensions.
Can I use this for a resolution that isn't a standard 16:10 panel?
Yes — enter any pixel width and height and the instrument reduces it to its own lowest-terms ratio, whatever that turns out to be. If your numbers don't reduce to 8:x, your display isn't a true 16:10 panel; it may be 16:9, 3:2 or another proportion entirely, and the simplified result will show you which.