Restock Alert Calculator: Reorder Point for Resellers

Calculate reorder points, safety stock, MOQ exposure, budget risk, and one-off inventory guardrails before restocking resale inventory.

Quick scenarios

Inventory fit

units
/day

Restock constraints

days
days
units
$
days

Unit economics

$
$
%
$
$
Decision
Order smaller or wait

Reduce MOQ exposure, split the order, or wait until cash and sell-through support the buy.

Suggested order exceeds the cash budget entered.
Suggested order creates more days of supply than the target window.
Days of stock
21
At current daily sales
Reorder point
31 units
13 safety units
Suggested order
120 units
$540.00 estimated cash
Unit margin
$7.50
After fee, shipping, and cost

Reorder math

30-day sell-through60 units
Lead-time demand18 units
Safety stock13 units
Days until trigger5 days
Projected stock after order144 units
Projected days of supply72 days

Risk screen

Lost profit from uncovered lead-time demand: $0.00

Storage carry cost for the target supply window: $17.28

Supplier setting: Variable lead time

Reorder only after confirming current supplier price, ship date, and platform-specific quantity handling.

Use this only for repeatable inventory

A restock alert is useful for repeatable SKUs: wholesale case packs, private-label accessories, replenishable parts, or a supplier lot you can buy again. It is the wrong tool for unique thrift, estate, or garage-sale inventory.

The reorder point is lead-time demand plus safety stock. The rest of the tool asks whether the recommended order still works after margin, cash, MOQ, storage, and overstock risk.

Marketplace guardrails

eBay multi-quantity listings

eBay's out-of-stock option can hide a depleted bulk listing from search until quantity is refilled. That makes the reorder date operational, not just theoretical.

Amazon restock planning

Amazon's Seller Central restock tools also frame restocking as a "how much and when" decision. Use platform reports when available, then use this calculator as an independent sanity check.

Related next checks

Before sending the purchase order, verify lot economics in the wholesale profit calculator, storage drag in the inventory turnover calculator, and monthly space cost in the storage unit ROI calculator.