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Inventory Reorder Point Calculator

Compare deterministic lead-time demand and safety stock with your optional inventory position.

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Your inputs

01 / Enter

These are editable examples, not recommended rates. Enter your own numbers.

Calculator inputs

Same stock unit used for all quantity inputs.

Use days consistent with your daily demand basis.

A user-supplied buffer; no statistical safety stock is inferred.

Blank omits the comparison; explicitly enter zero for no stock.

Requires current inventory; count only usable committed replenishment.

Your result

02 / Understand

Loading the example calculation…

Show the math

Estimates use unrounded numbers. Displayed amounts round to cents.

What this means

The reorder point covers expected demand while waiting for supply plus a separately chosen buffer. It is a review trigger, not a recommended purchase quantity.

Worked example

10 units/day, five days of lead time and ten safety units give a 60-unit reorder point. 30 on hand plus 20 incoming give position 50, triggering review. Position exactly 60 also triggers review.

How the math works

Reorder point = average daily demand × lead-time days + safety stock. Inventory position = current on hand + confirmed incoming, assuming no backorders. Review replenishment when position is at or below the point.

About this estimate

Constant demand and lead time, no backorders, reservations, scrap or unusable inventory. Incoming quantities are confirmed and timely. Fractional stock units are allowed where the material is divisible. No uncertainty distribution or order-size model is evaluated.

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Formula v1.0.0 · Reviewed · Tool ID: inventory-reorder-point