How do I plan for Amazon supplier lead-time variability?
Measure the last 6 to 10 POs and compute the standard deviation of total lead time. Add that variability into your safety stock. Track supplier lead-time performance monthly. Any supplier missing lead time by more than 15% consistently should either be replaced or padded aggressively in planning.
Jul 26, 2026 · 3 min read
Where lead time actually varies
Production is usually the biggest variable, especially around Chinese New Year and Golden Week. Transit is more predictable but customs delays cluster. FBA check-in varies most during Q4.
How to plan for it
Split total lead time into production, transit, and check-in. Track variance on each independently. Pad safety stock using the sqrt(lead time) formula on the combined standard deviation.
Frequently asked questions
Should I switch suppliers for lead-time misses?
Only if the miss is chronic. One late PO in a year is normal; three in a year is a red flag.
Do I need a backup supplier?
Yes for hero SKUs. Even a small ongoing PO with a second factory preserves the option.
Is DDP shipping faster or just simpler?
Simpler, and often faster because customs is handled by the freight forwarder as part of the door-to-door service.
See this in Nova
Nova surfaces this metric per SKU so you can act before your next monthly close catches it.
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