Use representative demand
Choose a recent period that reflects normal trading. Remove one-off events only when you can explain why they will not recur.
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Free inventory calculator
Reorder Point Calculator
Know when to replenish before usable stock runs too low. Enter the numbers you already know, or let the guided path derive simple estimates from your history.
01 · Calculate now
Calculate now
Use this when you know average demand and your safety buffer.
03 · Understand the result
A useful number, with its assumptions visible
The calculator separates expected lead-time demand from the extra protection you choose. Review the inputs whenever demand patterns or supplier performance change.
Average demand × lead time + safety buffer4 × 7 + 10 = 38
Measure real lead time
Count from placing the purchase order until the stock is actually received and usable—not merely dispatched.
Treat the buffer honestly
The guided coverage buffer is a practical starting point. Volatile or critical items may require a more rigorous safety-stock method.
04 · FAQ
Questions people ask before using a reorder point
Is the reorder point the amount I should buy?
No. It is the stock level that triggers action. Order quantity depends on supplier minimums, available space, cash, order costs, and expected future demand.
Should I use days or weeks?
Use either, but keep average demand, lead time, and extra coverage in the same period. Daily inputs are often easier when supplier lead times are measured in days.
What counts as usable stock?
Stock available to meet demand. Consider excluding damaged, expired, reserved, or otherwise unavailable units, and review open purchase orders separately.
How often should I update the result?
Review it when demand, supplier lead time, seasonality, or service expectations change—and on a regular cadence for important items.
Go deeper
How to set practical reorder points
Use the step-by-step Guide for input quality, exceptions, review cadence, and common mistakes.
Read the Guide →Manage the workflow
Small Business Inventory Control Tracker
Track up to 100 items and 300 movements with balances, stock status, reorder needs, KPIs, and reports in Excel 2021.
View the Inventory Control Tracker →Educational planning tool only. It does not forecast demand, calculate order quantity, automatically subtract open orders or reserved stock, or replace professional inventory advice.