Supplier Lead Time for FBA: How to Measure and Reduce It | Inventory Hero
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Supplier Lead Time for FBA: How to Measure and Reduce It
Supplier lead time is how long from PO to goods ready or delivered. How to measure quoted vs actual, track it per supplier, and reduce it, for FBA sellers.
Supplier lead time is the time from when you place a purchase order to when the goods are ready to ship or delivered, depending on your terms. It is the supplier-controlled portion of your total replenishment lead time, which also includes freight and Amazon check-in. For overseas manufacturing it typically covers production plus handling and can run from a few weeks to a couple of months.
How do I measure my supplier's lead time?
Measure it from your own purchase-order history, not the supplier's quote. Record the date you placed each PO and the date the goods were actually ready or delivered, and average the gap across recent orders. Track the variability too, not just the average, because a supplier that ranges from 30 to 70 days forces you to carry more safety stock than one that reliably takes 50.
Andrew Erickson is the founder of Inventory Hero. He has spent years working with Amazon FBA sellers on demand forecasting, restock planning, and the cash flow side of running a private-label brand. Inventory Hero exists because every spreadsheet-based inventory system he tried eventually broke — usually right before Q4.
Order ahead of the supplier's production schedule so your run is queued early, ask the supplier to hold common components or raw materials so only assembly remains, negotiate priority for reliable-volume orders, or dual-source so you are not dependent on one factory's queue. Simply asking the factory to rush rarely works and often costs a premium.
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Supplier lead time is the time from when you place a purchase order to when the goods are ready to ship or delivered: the supplier-controlled slice of your total replenishment lead time. The short version: measure it from your own order history rather than the supplier's optimistic quote, track it per supplier including how much it varies, and reduce it by ordering ahead and dual-sourcing rather than asking the factory to hurry. Below is how to measure, track, and shorten it.
Supplier lead time is one part of your total inventory lead time, which runs from placing the order to the stock being sellable on Amazon:
Supplier lead time: production plus handling, from PO to goods ready. The subject of this article.
Freight and transit: ocean or air, plus port handling.
Amazon receiving: check-in and stow at the fulfillment center.
Getting the supplier portion right matters most, because it is usually the largest and the most variable of the three, and it is the one you can influence through the relationship.
The single most common mistake is planning on the supplier's quote. Measure your actual instead:
Record every PO's placed date and ready (or delivered) date from your own records.
Average the gap across recent orders for each supplier and SKU.
Note the spread, not just the mean. A supplier that ranges 30 to 70 days is very different to plan around than one that reliably takes 50, even though both average 50.
That spread is lead-time variability, and it drives how much safety stock you need. An unreliable supplier is expensive precisely because it forces you to carry more buffer to cover the bad end of its range.
Averaged across your whole catalog, lead time is meaningless; a fast domestic supplier and a slow overseas one blend into a number that describes neither. Track it per supplier:
Keep a per-supplier lead-time record with recent actuals and the trend.
Flag the drifters. A supplier whose lead time is creeping up is a reorder problem building; catch it before it causes a stockout.
Weight your sourcing by reliability, not just price. A supplier 5 percent cheaper but wildly inconsistent can cost more once you price in the extra safety stock and the stockout risk.
There is no universal number, but as rough orientation:1
Domestic suppliers often run days to a couple of weeks, since there is no ocean transit and communication is faster.
Overseas manufacturing commonly runs 30 to 60 days for production and handling alone, before freight, and longer around peak seasons like the run-up to Chinese New Year, when factories back up.
Two cautions on any benchmark. First, it is the production portion only; add freight and Amazon receiving for your total. Second, the gap between quoted and actual is where sellers get burned: a factory that quotes 30 days but averages 45 has effectively added 15 days of stockout risk you did not plan for. Plan on your measured actual plus its variability, and treat the quote as the optimistic edge of the range.
Asking the factory to hurry rarely works and usually costs a rush premium. The durable levers are structural:
Order ahead of the production run. Placing your PO early enough to be queued in the supplier's next scheduled run avoids waiting for a slot.
Hold components upstream. Ask the supplier to keep common raw materials or sub-assemblies on hand so only final assembly remains when you order, which can cut weeks. This works once you order consistently enough that the supplier has a reason to carry that inventory for you, so it is a lever you earn with volume, not a day-one ask, and good PO payment terms can make holding that component stock work for your cash too.
Earn priority with reliable volume. A supplier will slot a dependable, well-communicating customer ahead of a sporadic one; the relationship is a lever.
Dual-source. A second qualified supplier means you are not hostage to one factory's queue, and the competition tends to sharpen everyone's lead time. See running multiple suppliers.
Most people search this term because a factory is late right now, not to study definitions. When a PO slips and you are watching stock run down, you have moves:
Get a real status, in writing. Push past "almost ready" for a specific completion date and a reason. Silence in week six is itself the answer; escalate through a different contact or your sourcing agent if you have one.
Ask for a partial shipment. Have the supplier ship the units already finished now and the balance when done. It gets some stock moving while the rest catches up.
Air-freight a bridge quantity. For a fast-selling SKU, air-freighting a partial run is expensive but often cheaper than the lost sales and rank damage of a stockout. Reserve it for the SKUs that earn it.
Protect rank first. If you will run out, prioritize keeping your best SKUs live even at a thin margin over a perfect landed cost on everything.
The lesson each late PO teaches is to widen the buffer next time: plan on the supplier's slow end, not its promise.
Once you have a measured supplier lead time, it feeds directly into your replenishment. Take a supplier that quotes 30 days but averages 45 with a 15-day spread: plan on the 45, not the 30, and size safety stock to cover the extra 15-day tail. On a SKU selling 10 units a day, that tail alone is 150 units of buffer you would not have carried if you trusted the quote, and skipping it is a stockout waiting to happen. Concretely:
Add the measured lead time to freight and Amazon receiving for your total, which sets your days of supply target.
Use that total to set your reorder date so you order early enough to avoid a gap, which together tells you when to reorder.
Size safety stock from the variability, not the average, so the unreliable suppliers are covered.
An accurate supplier lead time is also what keeps your cash flow plan realistic, because it determines when each reorder's cash actually goes out.
Supplier lead time is the PO-to-ready portion of your replenishment cycle, and it is the piece you have the most influence over. Measure your actual from order history, track it per supplier with its variability, and shorten it structurally by ordering ahead and dual-sourcing. Fed into your reorder date and safety-stock math, an accurate supplier lead time is what keeps you in stock without overbuying. It is a core input to restock planning.
Supplier lead-time ranges vary widely by product, factory, and season; the figures here are broad operator orientation, not measured or guaranteed values. Always plan on your own measured actual and its variability. ↩