A profitable Amazon business can still run out of cash — you pay your supplier, freight, and ads long before Amazon pays you. Enter a few numbers (or use a template) to see your cash conversion cycle, how much capital is trapped, and the funding gap on your next order. No login.
Your numbers
$
Product cost (COGS)35%
Landed cost of goods as a % of revenue — what you pay suppliers and freight, before Amazon fees.
Production lead time30 days
Days your supplier takes to manufacture after you order.
Shipping + inbound time35 days
Freight to the US plus Amazon receiving/check-in.
Days inventory sits before selling45 days
How long stock waits in FBA before it sells (sell-through speed).
Amazon payout + reserve delay14 days
Your Amazon disbursement cycle plus any account reserve hold — read it off your settlement dates.
$
Healthy
Working capital trapped in your supply chain
$0
—
Cash conversion cycle (CCC)0 days
Monthly cost of goods (COGS)$0
Capital tied up at any time$0
Funding gap on your next order$0
Safe reinvestment cap$0
Your next order needs more cash than you have on hand
Scaling on credit cards or skipping the order both cost money: a stockout stops sales, and card interest eats into margin. Supply-chain funding aligned to your payout cycle bridges the gap without taking equity.
See seller funding options →
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Deep dive — Amazon seller cash flow & working capital
Why a profitable Amazon business runs out of cash
Profit and cash are not the same number. Amazon collects from the buyer immediately, then holds your money for roughly two weeks — while you've already paid your supplier, your freight forwarder, and your ad bill. Every extra dollar of revenue creates an extra dollar of working capital tied up in inventory, inbound shipping, and reserves before the matching payout lands. That's why growth can leave a profitable seller short of cash: the profit is real, but it is tied up in stock and pending payouts.
The cash conversion cycle (CCC), in plain terms
CCC is the number of days a dollar is locked up before it comes back as spendable cash. The formula is straightforward: CCC = days inventory outstanding + days from sale to Amazon payout − days you delay paying suppliers. For a typical FBA seller it runs 30 to 90 days; above 120 days means your working capital is tied up too long. The calculator above also folds in production and freight lead times, because for an importer the cash leaves your account the moment you wire a deposit — long before the inventory is even sellable.
How much working capital you actually need
Capital tied up is roughly monthly cost of goods sold × CCC ÷ 30, so a 60- to 90-day cycle means 2 to 3x monthly COGS, plus a buffer for Q4. A seller doing $500K per month at 35% COGS ($175K) with that cycle needs roughly $350K–$525K in inventory and inbound product capital just to keep the wheel turning — before any growth. Faster-turning categories need less; slow movers need more. This is the number to watch, and it's why a great sales month can still empty the bank account.
The funding gap, and why stockouts cost more than borrowing
The funding gap is the cash your next inventory order needs that you don't currently have on hand. Sellers hit it constantly because the cash from this batch is still locked in pending payouts and unsold stock when it's time to reorder. Skipping the order to save cash has its own cost: while the ASIN is out of stock it makes no sales. Bridging the gap — through reimbursements you're already owed, tighter supplier terms, or supply-chain funding aligned to your payouts — keeps the ASIN in stock.
The levers that shorten your cycle
Tighter inventory turns: audit slow SKUs quarterly and redirect that capital to fast movers. Stock sitting past ~150 days also risks the 181-day aged-inventory surcharge.
Longer supplier terms: moving from prepay to Net 30 or Net 45 directly shortens your cycle.
Faster payout access: Amazon's payout delay is fixed, but daily-payout financing or reimbursement recovery can pull cash forward.
Don't fund growth on cards: a balance carried at 20%+ APR erases margin fast. If you can't clear cards in full, slow down and let cash catch up.
Is this estimate exact?
It's a planning estimate built on standard working-capital formulas (the cash conversion cycle and monthly COGS × CCC ÷ 30), not your exact bank reality. Real figures depend on your actual sell-through, supplier terms, reserve level, and seasonality. Pull trailing-90-day numbers from Seller Central and your accounting for a precise picture, and re-run this whenever your lead times or payout reserve change.
When does outside funding actually make sense?
The cleanest signal is when you've shortened the cycle as far as you reasonably can — tighter turns, better terms, recovered reimbursements — and still need cash to fund demand you can see coming. At that point, financing structured around your payout cycle (so repayment flexes with sales rather than a fixed term) is one option to compare against credit cards or skipping the order. Compare the all-in cost, not just the headline rate, and make sure the structure doesn't add new liquidity pressure.
Trace one illustrative China + sea-freight order through the calculator's own template numbers, on 30/70 payment terms. Day 0: you wire the 30% deposit — cash starts leaving. Day 30: production ends and the remaining 70% is due before shipping — now 100% of the order cost is out the door. Days 30–65: the goods are on the water and checking into FBA (35 days shipping + inbound). Days 65–110: units sell through over the typical 45 days of inventory. Add the template's 14-day payout delay — the slider's starting position, not an Amazon rule — and the last dollar of this order comes back around day 124 — four months after the first dollar left. Now size it: at an illustrative $100,000 monthly revenue with COGS around 35% ($35,000 a month), the cash conversion cycle the calculator shows is 103 days — the 124 days less 70% of the 30 production days, because that share of the payment leaves only when production ends — and it keeps about $120,000 permanently locked in the pipeline while sales continue. On 100% prepay the cycle is the full 124 days and about $145,000. That's the number the "capital tied up" figure above is showing you, and why it grows every time revenue does.
Which lever actually shortens the cycle
The three inputs aren't equal. Supplier terms move CCC one-for-one: shifting from 100% prepay to 30/70 delays most of the outflow by the production time, and negotiating Net 30 after a few clean orders removes another thirty days — it's the only lever that costs engineering nothing and pricing nothing, just negotiation after you've proven you pay. Inventory days are the next biggest and reward boring discipline: smaller, more frequent orders and honest demand forecasts. Cutting the template's 45 sitting days to 30 frees two weeks of capital forever. Freight mode is the expensive lever: air removes most of the 35-day shipping leg, but you're paying real freight dollars to release capital — it only clears when the freed cash earns more (restock before a stockout, a Q4 window) than the air premium costs. Run your own numbers in the calculator with each lever changed one at a time; the CCC delta per lever is the decision.
Q4: when the cycle and the calendar collide
The cruel arithmetic of a long cash cycle is that Q4 inventory is bought in late summer. With the template's ~65 days of production plus freight, stock that must be sellable in early November needs its deposit wired around late August — which is also when you're still carrying the capital from your current orders. That's why the steady-state formula on this page (monthly COGS × CCC ÷ 30) understates the seasonal peak: in the build-up months you're funding two seasons at once, and the trapped-capital figure above can transiently double. The planning move: run this calculator twice — once with normal monthly revenue, once with your Q4 forecast — and treat the difference as the cash you must have arranged (from reserves, terms, or funding) before the deposit date, not before the sales date.
A sane order of funding operations
When the funding-gap line above goes red, the order in which you reach for money matters. First, collect what you're already owed: pending payouts you can time orders around, and unclaimed FBA reimbursements, which reimbursement services put at 1–3% of annual sales. Second, negotiate time instead of money — supplier terms are interest-free funding, and one conversation can beat any lender's rate. Third, if you borrow, match the instrument to the cycle: supply-chain or revenue-based funding that repays as payouts land keeps repayment aligned with the cash it freed, while credit card interest at 20%+ APR keeps compounding until the balance is paid — the calculator's "safe reinvestment cap" exists precisely to show how much growth you can fund without borrowing at all. And whatever the source, borrow against a specific order with a known cycle length, not against general optimism.
More questions sellers ask about cash flow
What's the fastest way to shorten my cash conversion cycle?
Supplier payment terms. Moving from full prepay to a deposit structure, then to Net 30 after a few reliable orders, removes weeks from the cycle at zero cash cost — the reduction passes straight through the CCC formula. Inventory sell-through is the second lever; freight mode is the most expensive one. Change one input at a time in the calculator to see each lever's effect on your numbers.
Is air freight worth it to free up trapped cash?
Sometimes — it's buying time with margin. Air removes most of the shipping leg (35 days in the sea template), but the premium is real money, so it only wins when the released capital or the earlier arrival earns more than the freight difference costs: avoiding a stockout, or landing before a seasonal window. Compare the freight difference with what the same cash would cost to borrow.
How much of my profit can I safely reinvest into inventory?
The calculator's safe reinvestment cap estimates it from your own cycle: cash on hand minus the capital your current pipeline already claims, sized so the next order doesn't create a gap. The qualitative rule behind it — reinvest from cash that has actually returned, not from revenue that's still locked in inventory and pending payouts. Growth funded from unreturned cash is how profitable sellers go broke.
How should I set the payout delay?
From your own settlement history, not a textbook figure — which is why the calculator's payout field is an input rather than a fixed number. A reserve on your account holds funds longer than the normal disbursement cycle. Check the settlement dates for your last few disbursements and enter what Amazon actually does to your account. Your Payments dashboard in Seller Central shows the dates for your own account.
Sources & how this calculator is maintained
The cash conversion cycle formula used here is the standard working-capital calculation (inventory days + receivable days − payable days), extended with production and freight lead times because import sellers pay long before inventory is sellable. The payout field is a seller input, not a published figure: re-checked on 29 September 2026, neither official source below carries a disbursement cycle, so the page no longer states one and asks you to read it off your own settlement dates. Template lead times are typical figures for the named shipping modes and are the slider’s starting positions, not Amazon rules, and the working-capital figure is the formula monthly COGS × CCC ÷ 30, not an industry benchmark. Marginely is an independent seller-tools site. The funding link above is an affiliate link — the commission disclosure sits beside it, and commissions do not change the guidance shown, including the recommendation to exhaust reimbursements and supplier terms before borrowing. We review this page on a recurring cycle and when Amazon changes its disbursement policy. Found a discrepancy? Tell us via the about page — we verify against the source and correct. Official sources: Amazon Selling Partner pricing and Fulfillment by Amazon.
Last reviewed: July 21, 2026 · next scheduled review with Amazon's next disbursement or reserve policy change.
