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Reorder point calculator

Built on your total lead time, not the supplier's quote. Five inputs, and you see both numbers: the reorder point that keeps you in stock, and the one your spreadsheet probably uses. No email, no signup.

AY
Anand Yadav · Founder, ReccordSOP
·Last reviewed August 4, 2026

Five numbers, all in days except the first. Everything is calculated in your browser.

Use a 30-60 day average for this SKU. Decimals are fine.

The production + ship time on the quote or the last PO confirmation.

For your actual shipping mode. Sea freight from Asia is typically 25-40; air is 5-10; domestic ground 2-5.

Dock to sellable. Most 3PLs quote 1-3 business days; peak season runs longer.

How many days of demand you want as a cushion. 7-14 for steady A-SKUs; more if demand or the supplier is volatile.

The formula is fine. The lead-time input is what fails.

Every reorder point formula is the same multiplication: daily demand times lead time, plus a buffer. What separates brands that stay in stock from brands that do not is one input. The supplier's quoted lead time covers production. Your money is on the shelf only after freight, customs, and your 3PL's receiving queue, and that total is routinely two to four weeks longer than the quote. A reorder point built on the quote is not wrong math, it is right math on a wrong number, and it fires the purchase order weeks late every single cycle.

FAQ

The stock level that triggers a new purchase order for a SKU. The formula is demand during lead time plus safety stock: your average daily sales multiplied by the days it takes a new order to become sellable stock, plus a buffer. When on-hand inventory drops to that number, you order.

Your total lead time, not the supplier's quote. The quote covers production and sometimes shipping. It leaves out freight and customs for your actual shipping mode and receiving at your warehouse or 3PL. Measure it from your last two purchase orders: PO date to the stock going sellable. If the last two POs disagree, use the slower one.

This calculator uses days of cover, which is deliberately simpler than the statistical z-score formulas: 7 to 14 days of demand for steady A-SKUs, more when demand is volatile, the supplier has slipped before, or the lead time is long. If you want the fuller treatment with variability math, an inventory tool can layer it on later. Most stockouts are caused by a wrong lead time, not by an unsophisticated buffer.

Monthly for your top-revenue SKUs, and immediately when a product's velocity shifts hard or a supplier's lead time changes. A reorder point is a snapshot of one moment's demand and lead time. Set once and never revised, it fails quietly: the trigger still fires, just too late.

No. Everything is calculated in your browser. Nothing is collected, nothing is sent anywhere.

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