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📐 平方英尺面积计算器Square Footage Calculator
按长宽计算房间或地块的平方英尺、平方米和平方码面积，支持矩形、圆形、三角形，可估算总价。Work out square feet, square meters and square yards for rectangles, circles and triangles, with optional cost per square foot.
使用说明与常见问题How-to & FAQ
「平方英尺面积计算器」是什么？What is the Square Footage Calculator tool?
按长宽计算房间或地块的平方英尺、平方米和平方码面积，支持矩形、圆形、三角形，可估算总价。Work out square feet, square meters and square yards for rectangles, circles and triangles, with optional cost per square foot.
如何使用「平方英尺面积计算器」？How do I use the Square Footage Calculator tool?
在「平方英尺面积计算器」中，填写「形状」、「长度」、「宽度」、「单位」、「数量」等参数，结果会随输入实时计算并显示在下方。In the Square Footage Calculator: Fill in "Shape", "Length", "Width", "Unit", "Quantity"; results are recalculated instantly as you type.
1 平方米等于多少平方英尺？How many square feet are in a square meter?
1 平方英尺 = 0.09290304 平方米（精确值），所以 1 平方米 ≈ 10.7639 平方英尺。1 sq ft = 0.09290304 m² exactly, so 1 m² ≈ 10.7639 sq ft.
不规则房间怎么算？How do I measure an irregular room?
把房间拆成几个矩形或三角形分别计算再相加；同形状多块可用「数量」。Split it into rectangles or triangles, calculate each and add them up; use Quantity for repeated identical pieces.
「平方英尺面积计算器」免费吗？需要注册吗？Is the Square Footage Calculator free? Do I need an account?
「平方英尺面积计算器」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 Square Footage 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.