📦 再订货点 ROPReorder Point Calculator

使用说明与常见问题How-to & FAQ

「再订货点 ROP」是什么？What is the Reorder Point Calculator tool?

再订货点 = 日均用量 × 交货周期（天）+ 安全库存；也可按"最大日用量 × 最长交货期 - 平均日用量 × 平均交货期"估算安全库存。本地处理。Reorder point = average daily usage × lead time (days) + safety stock; safety stock can be estimated as max daily usage × max lead time - average usage × average lead time. Processed locally.

如何使用「再订货点 ROP」？How do I use the Reorder Point Calculator tool?

填写平均日用量、平均交货期和安全库存，即可得到再订货点 = 日用量 × 交货期 + 安全库存；安全库存可留空，并填写最大日用量和最长交货期来估算。结果会随输入实时更新。Enter the average daily usage, average lead time and safety stock to get the reorder point = usage × lead time + safety stock; leave safety stock blank and give the maximum usage and lead time to estimate it. The result updates as you type.

经济订货量？Order quantity?

订多少可用经济订货量 EOQ = √(2DS/H) 来定。How much to order can come from EOQ = √(2DS/H).

能举个计算实例吗？Can you show a worked example?

例如在「再订货点 ROP」中填 平均日用量 = 20，平均交货期（天） = 7，安全库存（留空则估算） = 50，最大日用量（估算用） = 30，最长交货期（估算用） = 10，结果区显示：再订货点：190；交货期内需求：140；安全库存：50For example, entering Average daily usage = 20, Average lead time (days) = 7, Safety stock (blank = estimate) = 50, Max daily usage (for estimate) = 30, Max lead time (for estimate) = 10 in the Reorder Point Calculator gives: Reorder point: 190; Lead-time demand: 140; Safety stock: 50

哪些输入会被检查？Which inputs are validated?

「再订货点 ROP」会检查这些输入——「平均日用量」、「平均交货期（天）」：必须填写，须大于 0；「安全库存（留空则估算）」：不能为负数；「最大日用量（估算用）」、「最长交货期（估算用）」：必须填写，不能为负数；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 Reorder Point Calculator checks its inputs — "Average daily usage", "Average lead time (days)": required, must be greater than 0; "Safety stock (blank = estimate)": cannot be negative; "Max daily usage (for estimate)", "Max lead time (for estimate)": required, cannot be negative; 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?

「再订货点 ROP」的设置：「平均日用量」默认 20；「平均交货期（天）」默认 7；「安全库存（留空则估算）」默认 50；「最大日用量（估算用）」默认 30；「最长交货期（估算用）」默认 10。每次生成结果都按当前设置处理。Settings in the Reorder Point Calculator — "Average daily usage" default 20; "Average lead time (days)" default 7; "Safety stock (blank = estimate)" default 50; "Max daily usage (for estimate)" default 30; "Max lead time (for estimate)" default 10. The result always uses the current settings.

「再订货点 ROP」免费吗？需要注册吗？Is the Reorder Point Calculator free? Do I need an account?

「再订货点 ROP」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 Reorder Point 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.