🚰 流量计算器Flow Rate Calculator

使用说明与常见问题How-to & FAQ

「流量计算器」是什么？What is the Flow Rate Calculator tool?

由管道内径和流速按 Q = A·v 计算体积流量，或由流量反求流速；结果同时给出 L/s、L/min、m³/h 和美制加仑每分钟（GPM）。Calculate volumetric flow Q = A·v from pipe inner diameter and flow speed, or the speed from a flow rate, in L/s, L/min, m³/h and US gallons per minute (GPM).

如何使用「流量计算器」？How do I use the Flow Rate Calculator tool?

在「流量计算器」中，填写「求解」、「管内径 mm」、「流速 m/s」、「流量 L/min」等参数，结果会随输入实时计算并显示在下方。In the Flow Rate Calculator: Fill in "Solve for", "Inner diameter mm", "Flow speed m/s", "Flow rate L/min"; results are recalculated instantly as you type.

用的是什么公式？What is the formula?

Q = A × v，A = π × D² ÷ 4（D 为管内径）。1 US 加仑 = 3.785411784 L。Q = A × v with A = π × D² ÷ 4 (D the inner diameter). 1 US gallon = 3.785411784 L.

1–2 m/s 的设计流速有出处吗？Is the 1–2 m/s design speed sourced?

没有单一出处：这是给水管道设计中常见的经验范围，各国规范、管材和用途（入户支管、干管、泵吸入管）的建议值都不同。工具只在超过 3 m/s 时给出提示，3 m/s 也是本工具自定的提醒阈值，不影响计算结果；具体设计请以当地规范为准。There is no single source: it is a common rule of thumb for water supply design, and codes, pipe materials and uses (branches, mains, pump suction) recommend different values. The tool only shows a hint above 3 m/s, a threshold the tool chose itself, and it does not affect the result; follow your local code for real designs.

计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?

「流量计算器」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 Flow Rate 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.

「流量计算器」免费吗？需要注册吗？Is the Flow Rate Calculator free? Do I need an account?

「流量计算器」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 Flow Rate 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.