Cash Conversion Cycle for FBA: Formula and Example | Inventory Hero
·5 min readCash Flow
Cash Conversion Cycle for FBA: Formula and Example
The cash conversion cycle is how many days your cash is tied up from paying suppliers to collecting from Amazon. Formula, example, and how to shorten it.
It is the number of days your cash is tied up in operations, from the day you pay your supplier for inventory to the day you collect the cash from selling it. The formula is days inventory outstanding plus days sales outstanding minus days payables outstanding. A shorter cycle means your cash comes back faster and you need less working capital to run the business.
How do you calculate the cash conversion cycle for an FBA business?
Add your days inventory outstanding (how long stock sits before selling) to your days sales outstanding (how long until you collect, roughly Amazon's two-week disbursement cycle), then subtract your days payables outstanding (how long your supplier lets you defer payment). For example, 60 + 14 - 30 = a 44-day cash conversion cycle.
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.
Attack the three levers: sell inventory faster to cut inventory days (the biggest term for FBA), negotiate longer supplier payment terms to raise payable days, and keep Amazon's payout timing in view since receivable days are largely fixed. Inventory days and supplier terms are where the real gains are, and improving both at once compounds.
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The cash conversion cycle is the number of days your cash is tied up from the moment you pay your supplier to the moment you collect the cash from selling that inventory. The short version: it is the single number that captures your FBA cash gap, inventory days usually dominate it, and every day you shave off frees working capital directly. Below is the formula, a worked example, and where an FBA seller actually moves it.
CCC = days inventory outstanding + days sales outstanding - days payables outstanding
Days inventory outstanding (DIO) is how long stock sits before it sells, which is your days sales in inventory. For FBA this is almost always the largest term.
Days sales outstanding (DSO) is how long from sale to cash in hand. For FBA it is short and fairly fixed: roughly Amazon's two-week disbursement cycle, not the months a wholesaler waits on invoices.
Days payables outstanding (DPO) is how long your supplier lets you defer payment. Every day here is a day the supplier finances your inventory instead of you.
Because you subtract payables, longer supplier terms shrink the cycle, and faster-selling inventory shrinks it too.
Take a SKU with a 60-day DIO, Amazon disbursing on a 14-day cycle, and net-30 supplier terms:
Term
Days
Days inventory outstanding
60
Days sales outstanding
14
Days payables outstanding
30
Cash conversion cycle
60 + 14 - 30 = 44
That 44-day cycle is how long your cash is locked up per turn. On 300,000 dollars of annual COGS, roughly 300,000 / 365 x 44 ≈ 36,000 dollars is tied up in the cycle at any moment. Cut the cycle to 30 days and you free about 12,000 dollars of that, cash you can put toward the next order instead of borrowing.
DIO is your average inventory value divided by COGS, times the days in the period, or simply 365 divided by your inventory turnover. Pull inventory value from the FBA Inventory (or Inventory Age) report and units-sold and COGS from Business Reports by ASIN priced at your landed-cost records.
DSO you can approximate at Amazon's disbursement cadence, commonly around 14 days plus any reserve hold, which you can confirm in the Payments reports. New accounts with longer reserves should use a higher number.
DPO comes straight from your supplier terms and purchase-order payment records: the average days between receiving goods and paying for them.
Measure it per SKU for your top products and at the account level for the whole business. The account number tells you how much working capital the business needs; the per-SKU number tells you which products are stretching it. Recompute it quarterly, since supplier terms and sales velocity both drift.
DIO is your biggest lever. Selling faster, ordering closer to demand, and clearing slow movers all cut inventory days, which is where most FBA cash is trapped. See inventory turnover.
DPO is your cheapest lever. Negotiating net-30 or net-60 supplier terms raises payables and shrinks the cycle at no cost but the conversation.
DSO is largely fixed. You cannot make Amazon pay faster, but you can plan around the reserve and disbursement timing so you are never caught short.
None of this matters if the underlying sale barely profits, so keep an eye on contribution margin per SKU: the goal is to speed up cash on products actually worth selling, not to churn low-margin volume faster.
There is no official benchmark, but as an operator rule of thumb for overseas-sourced FBA:
Cash conversion cycle
Read
Under 45 days
Strong; cash cycles back fast
45 to 90 days
Typical for China-sourced FBA
Above 90 days
Watch closely; cash is stretched
Above 120 days
Working-capital warning
These are directional, not measured figures, and they depend heavily on your lead time: a 75-day overseas lead time makes a sub-45-day cycle nearly impossible, so judge your number against your own sourcing rather than a flat target. Domestic sourcing shifts the whole table down.
A shorter cycle is always better, and the ideal is a negative one. A negative cash conversion cycle means you collect from customers before you have to pay your suppliers, so your suppliers and buyers are financing your inventory for you. It is hard to reach on FBA because inventory days are long, but you get closer to it every time you push supplier terms out and pull inventory days down.
Even without going negative, the discipline is the same: measure the cycle, know which term is stretching it, and work that term. It is the clearest single scorecard for the health of your FBA cash flow.
The cash conversion cycle is DIO plus DSO minus DPO: the days your cash is locked between paying suppliers and collecting from Amazon. Inventory days dominate it, supplier terms are the cheapest way to shrink it, and a shorter cycle frees working capital dollar for dollar. Track it as your cash scorecard alongside the wider FBA cash flow system and the inventory KPIs underneath it.