🖥️ 屏幕尺寸计算器（宽高、面积、PPI、两块屏对比）Screen Size Calculator (Width, Height, Area, PPI, Compare Two Screens)
由对角线尺寸和宽高比（16:9、21:9、4:3 等）求屏幕的宽、高和面积（英寸和厘米），输入分辨率可求像素密度 PPI 和点距；还可以和第二块屏幕比较面积大小，看换屏后显示面积变化多少。本地处理。From the diagonal and aspect ratio (16:9, 21:9, 4:3 and so on) get the screen width, height and area in inches and centimetres; add a resolution for pixel density (PPI) and dot pitch; and compare with a second screen to see how much the viewing area changes. Processed locally.
使用说明与常见问题How-to & FAQ
「屏幕尺寸计算器（宽高、面积、PPI、两块屏对比）」是什么？What is the Screen Size Calculator (Width, Height, Area, PPI, Compare Two Screens) tool?
由对角线尺寸和宽高比（16:9、21:9、4:3 等）求屏幕的宽、高和面积（英寸和厘米），输入分辨率可求像素密度 PPI 和点距；还可以和第二块屏幕比较面积大小，看换屏后显示面积变化多少。本地处理。From the diagonal and aspect ratio (16:9, 21:9, 4:3 and so on) get the screen width, height and area in inches and centimetres; add a resolution for pixel density (PPI) and dot pitch; and compare with a second screen to see how much the viewing area changes. Processed locally.
如何使用「屏幕尺寸计算器（宽高、面积、PPI、两块屏对比）」？How do I use the Screen Size Calculator (Width, Height, Area, PPI, Compare Two Screens) tool?
在「屏幕尺寸计算器（宽高、面积、PPI、两块屏对比）」中，填写「对角线 in」、「比例宽」、「比例高」、「分辨率宽 px（可选）」、「分辨率高 px（可选）」等参数，结果会随输入实时计算并显示在下方。In the Screen Size Calculator (Width, Height, Area, PPI, Compare Two Screens): Fill in "Diagonal in", "Aspect w", "Aspect h", "Resolution width px (optional)", "Resolution height px (optional)"; results are recalculated instantly as you type.
屏幕的宽高怎么算？How are screen width and height worked out?
对角线 d 和宽高比 w:h 满足勾股定理：宽 = d × w ÷ √(w² + h²)，高 = d × h ÷ √(w² + h²)。27 英寸 16:9 屏约宽 23.5、高 13.2 英寸。The diagonal d and aspect w:h satisfy Pythagoras: width = d × w ÷ √(w² + h²) and height = d × h ÷ √(w² + h²). A 27-inch 16:9 screen is about 23.5 × 13.2 inches.
PPI 是什么？What is PPI?
每英寸像素数 = √(横向像素² + 纵向像素²) ÷ 对角线英寸。27 英寸 2560 × 1440 约 109 PPI。数值越高画面越细腻。Pixels per inch = √(horizontal² + vertical²) ÷ diagonal in inches. A 27-inch 2560 × 1440 screen is about 109 PPI; higher is sharper.
为什么同样尺寸的屏面积不同？Why do screens of the same size differ in area?
尺寸只量对角线。比例越接近正方形，面积越大：同为 27 英寸，4:3 屏比 16:9 屏面积大约 15 %，21:9 带鱼屏则更小。Size measures only the diagonal. The squarer the ratio, the bigger the area: at 27 inches a 4:3 screen has about 15 % more area than 16:9, and a 21:9 ultrawide has less.
能举个计算实例吗？Can you show a worked example?
例如在「屏幕尺寸计算器（宽高、面积、PPI、两块屏对比）」中填 对角线 in = 10，比例宽 = 4，比例高 = 3，结果区显示：宽 in：8；高 in：6；宽 × 高 cm：20.32 × 15.24；对角线 cm：25.4；面积：48 in² = 309.7 cm²For example, entering Diagonal in = 10, Aspect w = 4, Aspect h = 3 in the Screen Size Calculator (Width, Height, Area, PPI, Compare Two Screens) gives: Width in: 8; Height in: 6; Width × height cm: 20.32 × 15.24; Diagonal cm: 25.4; Area: 48 in² = 309.7 cm²
哪些输入会被检查？Which inputs are validated?
「屏幕尺寸计算器（宽高、面积、PPI、两块屏对比）」会检查这些输入——「对角线 in」、「比例宽」、「比例高」：必须填写，须大于 0；「分辨率宽 px（可选）」：须为不小于 1 的整数；「分辨率高 px（可选）」：须大于 0；「对比屏对角线 in（可选）」：可留空；「对比屏比例宽」、「对比屏比例高」：必须填写，须大于 0；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Screen Size Calculator (Width, Height, Area, PPI, Compare Two Screens) checks its inputs — "Diagonal in", "Aspect w", "Aspect h": required, must be greater than 0; "Resolution width px (optional)": must be a whole number of at least 1; "Resolution height px (optional)": must be greater than 0; "Second screen diagonal in (optional)": optional; "Second aspect w", "Second aspect h": required, must be greater than 0; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.
有哪些选项可以调整？What options can I adjust?
「屏幕尺寸计算器（宽高、面积、PPI、两块屏对比）」的设置：「对角线 in」默认 27；「比例宽」默认 16；「比例高」默认 9；「分辨率宽 px（可选）」默认 2560；「分辨率高 px（可选）」默认 1440；「对比屏对角线 in（可选）」可留空；「对比屏比例宽」默认 16；「对比屏比例高」默认 9。每次生成结果都按当前设置处理。Settings in the Screen Size Calculator (Width, Height, Area, PPI, Compare Two Screens) — "Diagonal in" default 27; "Aspect w" default 16; "Aspect h" default 9; "Resolution width px (optional)" default 2560; "Resolution height px (optional)" default 1440; "Second screen diagonal in (optional)" optional; "Second aspect w" default 16; "Second aspect h" default 9. The result always uses the current settings.
手机上能用吗？Does it work on mobile?
可以。「屏幕尺寸计算器（宽高、面积、PPI、两块屏对比）」支持触屏操作，在手机和平板浏览器中均可使用，无需安装 App。Yes. The Screen Size Calculator (Width, Height, Area, PPI, Compare Two Screens) supports touch input and works in mobile and tablet browsers without installing an app.
「屏幕尺寸计算器（宽高、面积、PPI、两块屏对比）」免费吗？需要注册吗？Is the Screen Size Calculator (Width, Height, Area, PPI, Compare Two Screens) free? Do I need an account?
「屏幕尺寸计算器（宽高、面积、PPI、两块屏对比）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Screen Size Calculator (Width, Height, Area, PPI, Compare Two Screens) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.