Replenishment calculator

Turn replenishment anxiety into a calculated reorder decision

The workbook uses the standard safety stock formula: service factor times daily demand standard deviation times the square root of supplier lead time. Rows turn red when current inventory is below the reorder point.

safety stock reorder point service level red alert

Download the Excel template

Method

Std. dev.

Safety stock

Inputs

4 fields

Core variables

Alert

Red

Low inventory

Outputs

3 fields

Safety stock, reorder point, order quantity

Input example

Replenishment input example

Current inventory, lead time, safety stock, and suggested order quantity are visible in one row.

Item Midwest warehouse beverages

Service level 95%

Supplier lead time 7 days

Current inventory 320 units

Suggested order 185 units

Free download

Review the replenishment calculation structure

Keep SKU, current inventory, average daily demand, demand variance, supplier lead time, and service level in one model.

File

supply_chain_safety_stock_reorder_point_calculator_template_en.xlsx

Sheets

Use case

Replenishment decisions and reorder point calculation

Convert service level into a service factor.

Use the square root of demand variance as daily demand standard deviation.

Apply red conditional formatting when current inventory falls below the reorder point.

Download the Excel template

Fill the blue input columns first, then review the reorder point and suggested order quantity.

Workflow

Safety stock calculation flow

Enter demand and lead time, calculate the reorder point, then handle the red alert rows first.

Enter demand variation

Use average daily demand and demand variance instead of setting stock by instinct only.

Choose service level

Translate the stockout target into a service factor.

Review reorder point

Reorder point equals lead-time demand plus safety stock.

Act on red alerts

Items below the reorder point move to the top of the replenishment list.

Adoption boundary

Where spreadsheets are enough and where systems help

Supply-chain workbooks are good for aligning decision logic. When data sources, permissions, and reminders grow, move the repeated parts into a system.

Spreadsheet fit

Single warehouse or small SKU set

When SKU count is low and replenishment is stable, the workbook is fast enough.

Small SKU set
Manual updates
Weekly review

Partial systemization

Alerts need routing

Systemize low-stock alerts when purchasing and warehouse teams both need notifications.

Multiple owners
Low-stock notices
Replenishment approvals

Full systemization

Multi-warehouse planning

When warehouses, suppliers, and channels grow, the calculation should move into a shared system.

Multiple warehouses
Automatic sync
Approval history

FAQ

Supply-chain template FAQ

Review the inputs and operating boundary before downloading.

Why use demand variance instead of average demand only?

Average demand shows level, but variance shows uncertainty. Replenishment decisions need both.

Can the service level be changed?

Yes. The template includes examples such as 90%, 95%, and 98%, and you can enter your own target.

Does the red alert blink?

Standard macro-free workbooks use red conditional formatting instead of blinking effects.