The cash conversion cycle formula is days inventory outstanding plus days sales outstanding minus days payable outstanding. It expresses working capital efficiency as a number of days, showing how long cash is tied up between paying suppliers and being paid by customers.
The cash conversion cycle formula
CCC = DIO + DSO - DPO, measured in days. Days inventory outstanding is how long stock sits before it sells. Days sales outstanding is how long you wait to be paid after selling it. Days payable outstanding is how long you take to pay your own suppliers, which is the one input that works in your favour. Add the first two, subtract the third, and you have the number of days your cash is unavailable to you.
The underlying balances come straight off the balance sheet, and the measurement rules for inventory and receivables sit in the AASB accounting standards. The cycle itself is a management metric, not a reported one. Nobody audits it and nobody files it, which means the definition is yours to set and yours to hold steady.
The three components, and how each is calculated
Each component uses an average balance over the period against the relevant flow, annualised to 365 days. DIO is average inventory divided by cost of goods sold. DSO is average accounts receivable divided by revenue. DPO is average accounts payable divided by cost of goods sold. Use opening and closing averages rather than a point in time, or a single large invoice at period end will distort the answer.
| What it measures | Where it usually goes wrong in a scale-up | |
|---|---|---|
| DIO | Days inventory outstanding. Average inventory divided by cost of goods sold, times 365. | Stock bought ahead of demand to protect a launch date, then left sitting because nobody revisited the forecast. |
| DSO | Days sales outstanding. Average accounts receivable divided by revenue, times 365. | Payment terms conceded during a negotiation nobody in finance was in. The revenue is booked; the cash is 90 days away. |
| DPO | Days payable outstanding. Average accounts payable divided by cost of goods sold, times 365. | Stretched quietly to buy time, which works until a key supplier tightens terms or asks for payment up front. |
What a good and a bad number looks like
There is no universal target, because the cycle is a property of the business model before it is a property of the finance team. A software business with monthly card payments and no inventory can run a cycle near zero or below it. Hold components as a hardware or deep tech business, or bill on milestones as a project business, and the cycle stays long and positive no matter how well it is managed.
So the useful reading is directional. Is the number moving, which component is moving it, and did anyone decide that. A CCC that lengthened by three weeks because sales quietly agreed longer payment terms to close a quarter is a real event that no P&L will show you.
This is the gap between profit and cash. A profitable month and a month where cash went backwards are entirely compatible.
Who owns working capital in a growing company
Nobody, usually, which is the problem. Inventory decisions sit with operations, payment terms sit with sales, and supplier terms sit with whoever negotiated the contract. Finance sees the consequence a month later. In high-growth businesses the maturity of the finance process is routinely outgrown by the growth itself,[1] and working capital is where that shows up first, because it is the one area that gets worse the faster you grow.
When working capital is genuinely the problem, it shows up in the brief. On one interim CFO search the three critical requirements were a project infrastructure background, experience with cash flow management including working capital and bank relations with refinancing in particular, and previous acquisition experience.[2] That is not a compliance profile. For a financial controller role at a dealership the responsibilities ran to management accounts, FP&A, budgeting, forecasting, working capital and cash flow, and inventory and stock, including the floor plan and profitable stock movement, with heavy business partnering across the shop floor, sales and servicing.[3]
What the cycle says about who you hire next
The length of your cash conversion cycle is one of the better guides to when you need a real finance leader. Timing depends on business type: fintechs such as lenders and payments businesses, and deep tech such as space and robotics, need finance earlier because finance is the product or because of inventory, while single-product SaaS businesses can delay and use fractional support.[4] Deep tech carrying inventory and stock is harder to run on a fractional arrangement for long, because the complexity of R&D and physical goods outpaces a part-time relationship.[5]
The practical test for a candidate is not whether they can recite the formula. It is whether they can tell you which of the three components they would attack first in your business, and who they would have to negotiate with inside the company to move it.
The cycle explains the movement. Liquidity metrics tell you whether you can survive it.
Common questions
What is the CCC formula?
The cash conversion cycle formula is CCC = DIO + DSO - DPO, expressed in days. Days inventory outstanding is how long stock sits before selling, days sales outstanding is how long customers take to pay, and days payable outstanding is how long you take to pay suppliers. What you are left with is the number of days your cash sits locked in the operating cycle. Lower is better.
What is a good cash conversion cycle?
It depends on the business model more than on the finance team. A subscription software business collecting monthly by card with no inventory can run near zero or negative, meaning customers fund the operation. A hardware, deep tech or project business will run a long positive cycle regardless of how well it is managed. The more useful question is whether your number is moving, which component is moving it, and whether anyone decided that.
Can the cash conversion cycle be negative?
Yes, and it is a strong position. A negative cycle means you collect from customers before you pay suppliers, so the operating cycle generates cash rather than consuming it. Businesses that take payment up front and settle supplier invoices on terms often sit here. It is a structural advantage of the model rather than something a finance team creates on its own.
Who should own working capital in a startup?
Finance should own the number, but the levers sit elsewhere: inventory with operations, customer payment terms with sales, and supplier terms with whoever signed the contract. That split is why working capital is often nobody's job until it becomes a crisis. What a founder should expect from a senior finance hire is not a report on the cycle but the authority and the relationships to change it, which means being in the commercial conversations rather than reading about them afterwards.
References
- What I see in high-growth businesses: the maturity of the finance process is often outgrown by the business's rapid growth.
- From an interim CFO brief I ran: the three critical requirements were a project infrastructure background, experience with cash flow management including working capital and bank relations, especially refinancing, and previous acquisition experience.
- From a financial controller brief at a dealership: the responsibilities include management accounts, FP&A, budgeting, forecasting, working capital and cash flow management, and inventory and stock, especially managing the floor plan and profitable stock movement, with significant business partnering across the shop floor, sales team, servicing desk, finance department and spare parts.
- How I read timing, having built a specialist finance recruitment firm for Australian tech, fintech and deep tech companies, as discussed on the Honest Wealth Builders podcast: the point at which a business needs a first finance hire or CFO depends on the business type. Fintechs such as lenders and payments, and deep tech such as space and robotics, need it earlier because finance is the product or because of inventory needs, while single-product SaaS businesses can delay and use fractional support.
- On deep tech specifically: businesses with inventory and stock require finance professionals earlier than SaaS companies, because operations are more complex through factors like R&D, which makes it harder to get by with only a fractional finance person for an extended period.