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🛢️ 管道容积计算器Pipe Volume Calculator
由管道内径和长度计算管内容积（π·r²·L），结果给出升、立方米和美制加仑，并可按液体密度估算管内液体的质量；也可输入外径和壁厚。Calculate the volume inside a pipe (π·r²·L) from its inner diameter and length, in litres, cubic metres and US gallons, with the mass of liquid inside for a given density; or enter the outer diameter and wall thickness.
使用说明与常见问题How-to & FAQ
「管道容积计算器」是什么？What is the Pipe Volume Calculator tool?
由管道内径和长度计算管内容积（π·r²·L），结果给出升、立方米和美制加仑，并可按液体密度估算管内液体的质量；也可输入外径和壁厚。Calculate the volume inside a pipe (π·r²·L) from its inner diameter and length, in litres, cubic metres and US gallons, with the mass of liquid inside for a given density; or enter the outer diameter and wall thickness.
如何使用「管道容积计算器」？How do I use the Pipe Volume Calculator tool?
在「管道容积计算器」中，填写「直径输入」、「内径或外径」、「壁厚」、「直径单位」、「长度」等参数，结果会随输入实时计算并显示在下方。In the Pipe Volume Calculator: Fill in "Diameter input", "Inner or outer diameter", "Wall thickness", "Diameter unit", "Length"; results are recalculated instantly as you type.
用的是什么公式？What is the formula?
V = π × (内径 ÷ 2)² × 长度。1 m³ = 1000 L，1 US 加仑 = 3.785411784 L。V = π × (inner diameter ÷ 2)² × length. 1 m³ = 1000 L and 1 US gallon = 3.785411784 L.
为什么要用内径？Why the inner diameter?
容积只取决于管内空间。管材常按外径或公称尺寸标注，选「外径和壁厚」时工具会用 外径 − 2 × 壁厚 求内径。Only the space inside counts. Pipes are often sold by outer or nominal size; with Outer diameter and wall the tool uses outer − 2 × wall.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「管道容积计算器」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Pipe Volume Calculator uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「管道容积计算器」免费吗？需要注册吗？Is the Pipe Volume Calculator free? Do I need an account?
「管道容积计算器」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 Pipe Volume 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.