Working Capital & The Cash Conversion Cycle
The Hook
Two companies can sell the exact same thing and yet one is always flush with cash while the other is forever scrambling. The difference often is not sales or margins. It is the speed at which cash flows through the business, and there is a single number that captures it.
Plain English
Working capital is the cash tied up in the everyday churn of running a business: money customers owe you, inventory sitting on shelves, and bills you owe suppliers. The cash conversion cycle (CCC) measures how many days your cash is locked up in that churn before it comes back to you. It is built from three measures, each counted in days. DSO (days sales outstanding) is how long customers take to pay you after a sale. DIO (days inventory outstanding) is how long inventory sits before you sell it. DPO (days payable outstanding) is how long you take to pay your own suppliers. The logic is intuitive once you see it. The longer customers take to pay and the longer inventory sits, the longer your cash is trapped, so DSO and DIO push the cycle up. The longer you can wait to pay suppliers, the longer you hold onto your cash, so DPO pulls the cycle down. A shorter cycle means cash comes back faster, which is almost always better.
The Math
The cash conversion cycle adds the two things that trap your cash (collecting from customers and holding inventory) and subtracts the one thing that frees it (delaying payment to suppliers). The result is the number of days your cash is tied up. Lower is better. A negative cycle means customers pay you before you even pay your suppliers, which is a cash machine.
- Cash conversion cycle (CCC) = DSO + DIO - DPO (all measured in days)
- DSO (days sales outstanding) = how many days, on average, customers take to pay you
- DIO (days inventory outstanding) = how many days, on average, inventory sits before selling
- DPO (days payable outstanding) = how many days, on average, you take to pay suppliers
A company collects from customers in 45 days on average (DSO = 45). Its inventory sits for 60 days before selling (DIO = 60). It pays its own suppliers in 30 days (DPO = 30). Cash conversion cycle = DSO + DIO - DPO = 45 + 60 - 30 = 75 days. That means cash is locked up in the business for 75 days from the moment the company pays for inventory until it finally collects from the customer. For 75 days, that money cannot be used for anything else. Knowing this number tells you exactly how much cash the everyday operation quietly ties up.
Take that 75-day company and improve each lever. It tightens collections so customers pay in 35 days (DSO drops from 45 to 35). It manages inventory better so it sits only 45 days (DIO drops from 60 to 45). It negotiates longer terms with suppliers and now pays in 50 days (DPO rises from 30 to 50). New cycle = 35 + 45 - 50 = 30 days. The cycle fell from 75 days to 30 days, a 45-day improvement. If the company runs about 10,000 dollars of cost through the cycle per day, freeing 45 days releases roughly 450,000 dollars of cash that was previously trapped. Same sales, same product, but a far healthier business simply by moving cash faster.
Some of the strongest businesses run a negative cash conversion cycle. Imagine a company that sells inventory in 20 days (DIO = 20), collects from customers almost immediately in 5 days (DSO = 5), but does not pay its suppliers for 60 days (DPO = 60). Cycle = 5 + 20 - 60 = negative 35 days. A negative number means the company collects cash from its customers a full 35 days before it has to pay its suppliers. In effect, customers fund the operation. This is why some fast-growing companies can expand without constantly raising money: their own cycle generates cash. Spotting a negative cycle tells you a business has a structural cash advantage built right into how it operates.
The Lingo
- Working capital
- Cash tied up in day-to-day operations: money customers owe and inventory on hand, minus what you owe suppliers.
- Cash conversion cycle (CCC)
- The number of days cash is locked up in operations before it returns. DSO plus DIO minus DPO. Lower is better.
- Days sales outstanding (DSO)
- The average number of days customers take to pay you after a sale. Higher DSO traps more cash.
- Days inventory outstanding (DIO)
- The average number of days inventory sits before it is sold. Higher DIO traps more cash.
- Days payable outstanding (DPO)
- The average number of days you take to pay your suppliers. Higher DPO frees up more of your cash.
- Negative cash conversion cycle
- When you collect from customers before you pay suppliers, so customers effectively fund the operation. A structural cash advantage.
Practice
In the Room
The Trap
Believing that strong sales automatically mean strong cash. A company can grow sales and profit while its cash conversion cycle quietly lengthens, because customers pay slower or inventory piles up faster than sales can clear it. That stretches the days cash is trapped, and a growing business can run dry even as the income statement smiles. Always check whether the cycle is getting longer or shorter alongside revenue. The question that exposes it: are we collecting cash faster than we are tying it up?
Quick Check
Q1.What is the formula for the cash conversion cycle?
Q2.DSO is 45 days, DIO is 60 days, and DPO is 30 days. What is the cash conversion cycle?
Q3.Which change would shorten the cash conversion cycle?
Q4.A company has DSO of 5 days, DIO of 20 days, and DPO of 60 days. What is its cash conversion cycle, and what does it mean?
Q5.A company's sales are growing nicely but its cash keeps getting tighter. What is a likely working-capital explanation?
Practice Out Loud
Your finance lead says: sales are up 15 percent, so why are we suddenly short on cash? In 60 seconds, explain the cash conversion cycle and name which of the three levers you would investigate first. The AI will push back with: are you telling me growing sales is making our cash problem worse?
Try it in real life
This week, pick one company you follow and find one real world example of working capital & the cash conversion cycle. Write down what you noticed in two sentences.
Wrap up this lesson
Submitting the Quick Check counts. Or mark it here when you feel ready.