When to reorder household supplies: dates and safety stock
Calculate reorder thresholds and purchase dates from stock, daily usage, lead time and safety stock.
Calculate reorder thresholds and purchase dates from stock, daily usage, lead time and safety stock.
Assumes constant usage. Whole days are rounded down to order earlier. Not for medicine dosing or medical recommendations.
Inputs are calculated only in your browser; never sent to the server, analytics or URL.
Method
Days remaining = Current stock ÷ Daily usage
Safety stock quantity = Daily usage × Safety stock (days)
Reorder point quantity = Daily usage × (Delivery or shopping lead time (days) + Safety stock (days))
Days until reorder = (Current stock − Reorder point quantity) ÷ Daily usage
Recommended order date: Start date + max(0, ⌊Days until reorder⌋); Estimated run-out date: Start date + ⌊Days remaining⌋
Estimated days after order = (Current stock + Order quantity (optional)) ÷ Daily usage
Notes
Assumes constant usage. Whole days are rounded down to order earlier. Not for medicine dosing or medical recommendations.