Reorder point calculator · New Zealand
When should you reorder?
Work out the reorder point and safety stock for any SKU — with lead-time presets built for Australian supply chains, from China sea freight to a domestic supplier.
The URL updates as you change inputs — copy it to share a scenario with your supplier or buyer.
Reorder point
73 units
Safety stock
33 units
0.8 days of cover
Demand during lead time
40 units
1 days
Reorder this SKU when on-hand stock falls to 73 units. That covers the 1-day lead time plus a 33-unit buffer for demand variability at your chosen service level.
Tired of calculating this by hand?
OpsUI tracks demand and lead time per SKU and raises reorder alerts automatically — while your accounting stays in Xero or MYOB. Modules from NZ$399/month.
The reorder point formula, explained
What is the reorder point formula?
Reorder point = (average daily demand × lead time in days) + safety stock. Safety stock = Z × daily demand standard deviation × √(lead time), where Z is the service-level factor (1.28 for 90%, 1.65 for 95%, 2.33 for 99%). When on-hand stock falls to the reorder point, you place a replenishment order.
How do I set the lead time for goods imported into Australia?
Use the full door-to-shelf time, not just the sailing time. China sea freight to an Australian port typically lands at 35–50 days once you include production, consolidation, the ocean leg, customs clearance and inland transport. Air freight is usually 7–12 days, and a domestic Australian supplier is often 3–7 days.
What service level should an Australian SME use?
Most SMEs use 95% for typical SKUs, which means you accept a stockout on roughly 1 replenishment cycle in 20. Use 97–99% for high-margin or hero SKUs where a stockout costs a sale and the customer, and 90% for low-value C-class items where holding extra stock is not worth the cash.
Can Xero or MYOB calculate reorder points automatically?
Not on their own — Xero and MYOB are accounting ledgers and do not hold lead times, demand variability or service levels per SKU. You either calculate reorder points manually (this calculator), or add an operations layer like OpsUI that tracks demand and lead time per SKU and raises reorder alerts automatically while your ledger stays in Xero or MYOB.