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🗺️ 土地面积（英亩）计算器Acreage Calculator
计算地块面积并换算成英亩、公顷、平方英尺和平方米：支持矩形、三角形、梯形、圆形，或按依次输入的边界坐标（鞋带公式）计算任意多边形。Find a plot's area in acres, hectares, square feet and square meters: rectangle, triangle, trapezoid, circle, or any polygon from its corner coordinates in order (shoelace formula).
使用说明与常见问题How-to & FAQ
「土地面积（英亩）计算器」是什么？What is the Acreage Calculator tool?
计算地块面积并换算成英亩、公顷、平方英尺和平方米：支持矩形、三角形、梯形、圆形，或按依次输入的边界坐标（鞋带公式）计算任意多边形。Find a plot's area in acres, hectares, square feet and square meters: rectangle, triangle, trapezoid, circle, or any polygon from its corner coordinates in order (shoelace formula).
如何使用「土地面积（英亩）计算器」？How do I use the Acreage Calculator tool?
在「土地面积（英亩）计算器」中，填写「长度单位」、「形状」、「长 / 底 / 上底 / 半径」、「宽 / 高 / 下底」、「梯形高」等参数，结果会随输入实时计算并显示在下方。In the Acreage Calculator: Fill in "Length unit", "Shape", "Length / base / top / radius", "Width / height / bottom", "Trapezoid height"; results are recalculated instantly as you type.
一英亩有多大？How big is an acre?
1 英亩 = 43,560 平方英尺 = 4,046.8564224 平方米（按 1959 年国际英尺），约 0.4047 公顷，约为美式橄榄球场比赛区（不含端区，100 × 53⅓ 码）的 0.9，或含端区整个场地的 3/4。1 acre = 43,560 sq ft = 4,046.8564224 m² (using the 1959 international foot), about 0.4047 ha — about 0.9 of an American football field's playing area without the end zones (100 × 53⅓ yd), or three quarters of it including the end zones.
多边形坐标怎么填？How do I enter polygon coordinates?
沿地块边界依次（顺时针或逆时针都可以）填写每个角点的 x,y 坐标，单位与上面选的长度单位相同，不需要重复第一个点。用鞋带公式计算，边不能交叉。List each corner's x,y in order around the boundary (clockwise or counterclockwise) in the chosen unit, without repeating the first point. The shoelace formula is used, so edges must not cross.
「土地面积（英亩）计算器」免费吗？需要注册吗？Is the Acreage Calculator free? Do I need an account?
「土地面积（英亩）计算器」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 Acreage Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.