Cash conversion cycle explained for operators

The cash conversion cycle is the number of days between paying for inputs and collecting cash from customers. It combines three working capital legs: inventory, receivables, and payables. Shorter cycles free cash; negative cycles mean customers effectively fund the operation.

It is an operating measure, not a profit measure. A business can be profitable and still run short of cash if the cycle lengthens, because growth consumes working capital before it produces it.

The cycle is best used as a trend and a comparison, not as a target imposed from outside. Two businesses in the same sector can run different cycles and both be healthy if their margins and funding costs differ.

Inventory days = average inventory / cost of goods sold x 365. Receivable days = average trade receivables / revenue x 365. Payable days = average trade payables / cost of goods sold x 365. Use the same period, the same averaging method, and the same number of days throughout.

The denominator choice matters. Inventory and payables relate to cost, receivables to selling price. Mixing revenue into inventory days understates the days in a high-margin business and makes the result incomparable with prior periods.

Use 365 days for an annual calculation and the actual number of days for a quarter or a month. Using 365 with quarterly figures multiplies the result by about four, which is the most common error in the calculation. State the formula in the report header so the reader knows which denominator produced the number.

Take inventory of 250,000, receivables of 300,000, payables of 180,000, annual revenue of 2,400,000, and annual cost of goods sold of 1,500,000. Inventory days are about 61, receivable days about 46, and payable days about 44. The cycle is roughly 63 days.

The cash tied up is the sum of the three average balances: 250,000 + 300,000 - 180,000 = 370,000. That is a useful cross-check. If the calculated cycle implies a very different figure, one of the legs is using the wrong denominator.

A single cycle figure says little without context. Plot 13 months, compare with the same month a year earlier, and mark any change in terms or in the product mix. Seasonality can move the number by weeks without anything being wrong.

Growth lengthens the cycle in cash terms even when the days stay constant. A business with a 60-day cycle and rising revenue needs more cash each quarter simply to fund the same number of days.

Seasonal businesses should compare the cycle with the same month in prior years, not with the previous month. A stock build before a peak season is a planned use of cash, not a deterioration in working capital.

Every leg has a lever and a cost. The aim is a shorter cycle that the operation can sustain, not the shortest number in a spreadsheet.

Do not improve one leg by damaging another. Extending payables to 90 days may shorten the cycle while making the business a lower priority supplier, which then lengthens lead times and increases inventory.

Payment terms deserve a cash calculation before negotiation. Extending payables by 15 days on annual purchases of 1,500,000 frees about 61,600, but only if the supplier does not raise prices or deprioritise deliveries to compensate.

Report the cycle, each leg, and the cash value of a one-day change. A day of receivables is one day of revenue; a day of inventory is one day of cost of goods sold. That translation makes the number meaningful to operators.

Give each leg an owner. Inventory sits with buying and operations, receivables with credit control, payables with finance. Without owners, the cycle is a report rather than a target.

Set the target from the operating model, not from a benchmark. If inventory must be held for a long service obligation, a short cycle may be neither possible nor desirable.