Cash Conversion Cycle (CCC): Formula, Example and How It Drives Startup Runway

What is the cash conversion cycle?

The cash conversion cycle (CCC) is the number of days between the moment cash leaves your account to pay for inputs and the moment cash comes back from customers. A shorter cycle means your money is tied up for less time. A negative cycle means customers effectively finance your operations before you pay your own bills.

It combines three timing metrics into one number: how long inventory sits (days inventory outstanding, DIO), how long customers take to pay you (days sales outstanding, DSO) and how long you take to pay suppliers (days payable outstanding, DPO).

For a startup this matters because runway is a cash measure, not a profit measure. Two companies with the same revenue and the same margin can have very different cash positions if one collects in 15 days and the other in 75.

The CCC formula, step by step

The formula is CCC = DIO + DSO − DPO. DIO is average inventory divided by cost of goods sold, times the days in the period. DSO is accounts receivable divided by credit sales, times the days. DPO is accounts payable divided by cost of goods sold or credit purchases, times the days. Use the same period for all three.

A worked example with made-up numbers: a hardware-enabled startup holds 35 days of inventory, customers pay in 45 days and it pays suppliers in 30 days. CCC = 35 + 45 − 30 = 50 days. Every dollar of product it ships is financed by the company for about seven weeks before it comes back.

Most pure software startups carry no inventory, so DIO is zero and the formula collapses to DSO − DPO. If customers pay in 40 days and you pay vendors in 30, your cycle is 10 days. If you bill annual plans upfront and pay vendors monthly, it can turn negative.

How the cycle changes your runway

A longer cycle ties up more cash in working capital, and that cash is not available to cover burn. At a 50-day cycle, the company above must fund roughly 50 days of operating costs before customers repay it. Cut the cycle by 10 days and about 10 days of those costs return to the bank.

Put numbers on it. With $300,000 of cash, $30,000 of monthly net burn and $20,000 of cash tied up that you free by shortening the cycle, runway moves from 10 months to about 10.7 months. The gain is a one-time shift, not a permanent drop in burn, so treat it as a way to buy time for a milestone.

The effect compounds as you grow. A business that doubles revenue with the same cycle needs roughly twice as much cash tied up in working capital. Fast-growing companies can run out of cash while reporting rising revenue, which is why investors look at the cycle next to the growth rate.

What a negative cash conversion cycle means

A negative cycle appears when you collect from customers before you pay suppliers. Subscription businesses with annual prepay are the classic case: the customer pays for twelve months on day one, while you pay hosting, contractors and tools over the following months. The more you grow, the more cash the model generates.

That cash is not free money. For a prepaid plan, it is deferred revenue: you owe the customer twelve months of service, and the cash only becomes revenue as you deliver it. A negative cycle makes runway look comfortable, so keep the deferred balance in view before you spend it on hiring.

Marketplaces and platforms can also run negative cycles if they collect from buyers before paying sellers. In that case the cash often belongs to someone else, and regulators may require you to hold it separately. Read the rules for your model before treating it as working capital.

Three ways to shorten the cycle

Start with the collection side. Invoice on the day of delivery, send reminders before the due date and offer a modest discount for annual prepayment. Moving DSO from 45 to 30 days often does more for cash than any cost cut of the same size, and our guide to days sales outstanding shows how to measure it.

Next, look at the payment side. Negotiate longer terms with large, predictable suppliers and pay on the due date, not earlier. Stretching payments well past the agreed terms damages trust, so use DPO as a negotiated advantage and not as a habit of paying late.

Finally, reduce inventory if you hold any. Order smaller batches more often, sell slow items at a discount and avoid building stock before demand is proven. For software teams the equivalent is unbilled work: delivering without invoicing is DIO in disguise.

What is a good cash conversion cycle?

There is no universal benchmark, because the right number depends on your model. Retailers with fast-moving stock can run close to zero, while capital equipment makers may live with 100 days or more. The useful comparison is your own cycle over time and against companies with the same model.

For early-stage software, a cycle under 30 days is comfortable and a negative one is a strong position. For hardware or services sold to large customers, 60 to 90 days is common, so the question becomes whether your runway can finance it.

Track the three inputs every month, plus the result. A rising CCC with flat revenue is a warning that customers are paying later or inventory is piling up, and it shows in the bank balance before it shows in the profit and loss.

Feeling the cash cycle in Founder Runway

In Founder Runway, a run lasts 20 turns and every decision has four options. You choose a B2B, B2C or B2G business model and start at Pre-Seed, Seed, Pre-Series A or Series A, then manage cash, burn and runway as your choices play out. It is a learning game, not financial advice, but it makes the cost of slow money easy to feel.

A run can end in failure, a promising outcome, EBITDA positive or high-value exit potential. Try a B2G run next to a B2C one: long public-sector payment cycles and fast consumer payments teach the same lesson as the formula, without the spreadsheet.