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Business calculator
Reorder Point Calculator
Calculate average daily demand, lead-time demand and a reorder point including safety stock.
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Editable assumptions
Calculator guide
Set a reorder trigger from demand and lead time
The reorder point estimates the inventory position at which a replenishment order should be placed. It combines expected demand during lead time with a safety-stock buffer.
Average daily demand equals annual demand divided by operating days. Lead-time demand multiplies that daily rate by lead-time days.
Use inventory position rather than only on-hand stock when possible: on-hand plus open purchase orders minus committed demand. The simple calculator displays the arithmetic trigger only.
Review demand variability, supplier reliability, seasonality, minimum order quantities and service targets. Update assumptions whenever lead time or sales patterns change.
Formula
Set a reorder trigger from demand and lead time
Reorder point = (Annual demand ÷ Operating days × Lead-time days) + Safety stock
- Calculate average daily demand.
- Multiply by lead-time days.
- Add safety stock.
- Apply the trigger to inventory position.
Worked example
Worked example
Inputs
- Scenario
- 12,000 annual units over 365 days equal 32.88 units per day. With 14-day lead time and 200 safety units, the reorder point is about 660 units.
Results
- Result
- 12,000 annual units over 365 days equal 32.88 units per day. With 14-day lead time and 200 safety units, the reorder point is about 660 units.
Rounded planning example; replace assumptions in the live calculator.
Frequently asked questions
Reorder Point Calculator FAQ
What should I verify before using this calculator?
Verify the reporting period, included cost categories, units, currency and source records. Save those assumptions with the result.
How accurate is the result?
The arithmetic follows the displayed formula. Accuracy depends on complete inputs, consistent definitions and values from the same reporting period.
Can I use another currency?
Yes. Keep every monetary input in the same currency. The calculator does not convert exchange rates.
Should I use forecast or actual data?
Use actual data for performance review and documented assumptions for planning. Label forecasts clearly and compare them with actual results later.
Why should I compare several periods?
One period can be distorted by seasonality, promotions, delayed payments or unusual purchases. A consistent trend is more informative.
Is this accounting, tax or professional advice?
No. It is an independent planning tool. Reconcile results with your accounting records and qualified advisers where required.
Are my inputs uploaded?
No. Calculator inputs are processed locally in the browser and do not need to be sent to a server.
Primary sources
Official references and further reading
IRS Publication 538: Inventories ↗
Official context for maintaining inventory records.
Editorially reviewed: 2026-07-21
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