Demand planning is the process of turning a demand forecast into a concrete supply plan: which purchase orders to place, when, and in what quantity, reconciled with the cash you have, your FBA capacity, and what marketing and sourcing are planning. It is the bridge between predicting demand and acting on it.
What is the difference between forecasting and demand planning?
Forecasting predicts how much you will sell. Demand planning decides what to buy in response, accounting for constraints the forecast ignores: available cash, restock and capacity limits, supplier minimums, and planned promotions. Forecasting produces a number; demand planning produces a purchase plan.
T. Brian Jones is co-founder and CTO of Inventory Hero. He leads the engineering behind its Amazon data pipeline, demand forecasting, and the AI platform that lets sellers talk to their live inventory, sales, and supplier data in plain language.
A monthly cadence works for most FBA sellers, with a weekly restock check between cycles. The monthly pass updates forecasts, reconciles them against cash and capacity, and aligns with the marketing calendar; the weekly check triggers the SKUs that hit their reorder point in between.
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Demand planning for Amazon sellers is the loop that turns a demand forecast into actual purchase orders, reconciled with the cash you have, your FBA capacity, and what your marketing and sourcing plans are doing. The short version: forecasting predicts demand, demand planning decides what to buy about it, and the reconciliation step in the middle is where most sellers either stay solvent or overcommit. Below is the loop, the reconciliation that makes it work, and the cadence to run it on.
Demand planning is the process of converting a demand forecast into a concrete supply plan: which POs to place, when, and how big, given everything the raw forecast ignores. The forecast says a SKU will sell about 600 units next month. Demand planning asks whether you have the cash to buy them, the restock-limit headroom to send them in, the supplier lead time to get them in time, and whether a promo or launch is about to change the number. It is the bridge between inventory forecasting (and the methods you forecast with) and the restock plan.
Forecast demand per SKU. Project recent sales forward, adjusted for trend, seasonality, and known events. This is the input, not the plan.
Translate to a supply need. Convert the forecast into the units you need on hand and on order, using each SKU's lead time and safety stock.
Reconcile against constraints. Check the supply need against available cash, restock and capacity limits, supplier MOQs, and storage. This is where the plan meets reality.
Commit and place POs. Issue the orders that survive reconciliation, prioritized when cash is tight, and feed the rest back into the next cycle.
Steps 1 and 2 are arithmetic. Step 3 is judgment, and it is where most sellers slip. A forecast that ignores cash produces a plan you cannot fund. A forecast that ignores restock limits produces POs you cannot send into FBA. The reconciliation is about choosing, when you cannot do everything, which SKUs get the cash and the inbound space first, exactly the cash-constrained prioritization covered in the restock planning guide.
Here is the shape of it. Three SKUs all hit their reorder point this week: SKU A needs 400 units at $12 landed ($4,800), SKU B needs 250 at $8 ($2,000), and SKU C needs 300 at $5 ($1,500), but you have $5,000 to deploy this cycle. Rank by stockout risk and return: SKU A has about two weeks of cover left and the best margin, so it gets funded in full ($4,800). That leaves $200, not enough for a meaningful order on either of the others, so B and C wait for the next cycle, or you trim SKU A slightly to part-fund whichever of B and C is closer to running dry. The forecast told you all three were due; reconciliation decided which dollars protect the most profit.
This is also where forecasting and the rest of the business have to talk. If marketing is planning a Prime Day push or sourcing knows a supplier lead time just stretched, the plan has to absorb that before the POs go out, not after.
Demand planning is a rhythm, not a one-off. A common setup is a monthly planning pass plus a weekly restock check:
Monthly: refresh forecasts, reconcile against cash and capacity, and align with the marketing and sourcing calendars for the months ahead.
Weekly: trigger the SKUs that hit their reorder point in between (the reorder point calculator gives you the trigger level), within the month's funded plan.
The cadence keeps the three calendars, demand, cash, and marketing, from drifting apart, which is what causes the scramble of a stockout you "did not see coming" or a cash crunch from a PO you should not have placed.
Demand planning for Amazon sellers is the loop from forecast to funded purchase orders, with a reconciliation step that fits the plan to your real cash, capacity, and calendars. Forecast the demand, translate it to a supply need, reconcile honestly, and commit on a regular cadence. The forecast is the input; the plan is the point.