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在Excel中构建安全库存与再订货点模型,基于波动与服务水平计算参数

  • 2026-04-04 15:53:52
在Excel中构建安全库存与再订货点模型,基于波动与服务水平计算参数

🎯 开篇引入.

大家好,我是甜姐姐.
今天咱们来聊个很实用的东西.
在Excel里搞定“安全库存”和“再订货点(ROP)”模型,基于需求波动和服务水平来计算参数.
别怕,看完你就能在老板面前淡定展示,顺便让库存别再乱跑.

第一部分:规划数据仪表盘 📊.

场景:你手上有历史日/周/月需求数据,供应提前期不稳定,老板要 低缺货率又不想压太多库存.

规划思路指导.

  1. 明确目标:控制缺货风险,优化库存成本.
  2. 输入数据:历史需求序列(如日/周/月),平均提前期,提前期波动,目标服务水平(如95%).
  3. 输出指标:安全库存、再订货点、平均库存估算.

仪表盘基本结构.

  • 左侧:输入区(需求数据,提前期参数,服务水平).
  • 中间:计算区(需求均值、标准差、提前期影响).
  • 右侧:结果展示(安全库存、ROP、图表).

实用建议.
别一上来就瞎折腾图表,先把数据弄规整.
把原始数据做成表格,Ctrl + T 建表,方便后续引用.

第二部分:图表制作 📈.

动态柱状图 — 应用场景.

  • 展示每期需求变化,让大家直观看出波动.

操作步骤.

  1. 选中需求数据,插入→图表→簇状柱形图.
  2. 设置图表为表格动态引用,图表范围用表格列名.
  3. 快捷键:Alt + N, V 打开插入图表菜单.

最终效果.
随数据增加,柱状图自动扩展.
老板一看就知道需求哪几期峰值异常.

动态环形图 — 应用场景.

  • 展示库存组成,或安全库存占比.

操作步骤.

  1. 准备两列:安全库存、正常周转库存.
  2. 插入→图表→环形图,右键格式化数据标签显示百分比.

最终效果.
环形图清晰显示安全库存在总库存中的占比,便于评审是否合理.

第三部分:交互功能 🔧.

切片器概念引入.

  • 切片器能让你快速按产品/区域/时间筛选,动态刷新所有计算和图表.

具体操作步骤.

  1. 把数据做成数据透视表,插入→数据透视表.
  2. 选择数据透视表,插入→切片器,勾选需要的字段.
  3. 将图表基于数据透视表建立,切片器联动图表.

实用技巧.
小技巧提醒.
切片器可以设置多选或单选,长按 Ctrl 多选.
想看不同SKU的安全库存对比,直接选SKU切片器即可.

第四部分:整体整合 📝.

布局安排.

  • 顶部放关键输入(服务水平、提前期平均和标准差).
  • 左中放需求图表,右中放结果数值卡片(大字体).
  • 底部放说明和计算公式,方便审阅.

美化建议.
别让仪表盘太花哨.
配色用 2-3 种主色,重点数据用对比色突出.
字体尽量统一,数字用千分位格式,方便阅读.

实际效果.
完整仪表盘能让老板一眼看到缺货风险和库存占比.
还能通过切片器钻取到某个产品或某个区域的具体情况.

计算核心(示例公式)📌.

场景:基于正态分布近似,安全库存 = Z * σLT.
步骤(在Excel里).

  1. 计算需求均值:=AVERAGE(需求范围).
  2. 计算需求标准差:=STDEV.S(需求范围).
  3. 根据提前期(LT)处理:若LT以期为单位且需求独立,σLT = σ需求 * SQRT(LT平均).
  4. Z值由服务水平决定,例如95%→Z≈1.645,99%→Z≈2.33. Excel可用函数 =NORMSINV(服务水平).
  5. 安全库存 = NORMSINV(服务水平) * σ需求 * SQRT(平均提前期).
  6. 再订货点 ROP = 平均需求 * 平均提前期 + 安全库存.

代码/公式示例(简洁).

  • 需求均值:=AVERAGE(B2:B100) ; // B列为需求
  • 需求标准差:=STDEV.S(B2:B100) ;
  • Z值:=NORMSINV(0.95) ; // 服务水平95%
  • 安全库存:=NORMSINV(C1) C2 SQRT(C3) ; // C1服务水平,C2σ需求,C3平均提前期
  • ROP:=C4*C3 + C5 ; // C4平均需求,C5安全库存.

小技巧提醒.
别忘了把时间单位统一,需求是日数据,提前期也用天.
如果提前期也有波动,需要合并方差:σtotal = SQRT(σ需求^2 * LT平均 + (平均需求^2) * σLT^2).
这步容易犯错,多做几组样例验证结果是否合理.

总结梳理 🧾.

要点回顾.

  • 先规划,再计算,最后美化和交互.
  • 安全库存关键在于 需求波动 和 服务水平.
  • ROP = 平均需求×平均提前期 + 安全库存.

练习任务(做一下就能上手).

  1. 用你公司最近 6 个月的周需求数据,计算平均需求和标准差.
  2. 设服务水平 95%,提前期 2 周,计算安全库存和ROP.
  3. 用数据透视表和切片器,做一个按产品切换的仪表盘.

结尾激励 🌟.

别怕,按着甜姐姐的步骤一步一步来就行.
多练几次,你会发现库存不再像鬼画符那样飘忽.
加油,老板的赞赏就在前方等着你!

⦿ THE END ⦿

感谢阅读,欢迎点赞、收藏或分享

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  1. CONNECT:[ UseTime:0.000556s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000665s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000293s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000251s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000486s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000483s ]
  8. SELECT * FROM `article` WHERE `id` = 495733 LIMIT 1 [ RunTime:0.000465s ]
  9. UPDATE `article` SET `lasttime` = 1775300223 WHERE `id` = 495733 [ RunTime:0.000827s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000232s ]
  11. SELECT * FROM `article` WHERE `id` < 495733 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000398s ]
  12. SELECT * FROM `article` WHERE `id` > 495733 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000393s ]
  13. SELECT * FROM `article` WHERE `id` < 495733 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001910s ]
  14. SELECT * FROM `article` WHERE `id` < 495733 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001328s ]
  15. SELECT * FROM `article` WHERE `id` < 495733 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000898s ]
0.094506s