Why days working capital matters to a first-time founder
Days working capital shows how much money routine trading can tie up relative to sales. If the figure rises, growth may consume cash faster than expected even when revenue increases. Monitoring it helps founders plan funding and investigate slower collections, excess stock or shorter supplier payment terms.
Examples of days working capital
A company has £120,000 of trade receivables and inventory, less £40,000 of trade payables, against annual revenue of £730,000. Its net operating working capital is £80,000, so days working capital is about 40 days: £80,000 divided by £730,000, multiplied by 365.
Common misunderstanding
It is not the number of days until every asset becomes cash, and calculation conventions vary. Some analysts use sales, others cost of sales, and definitions of operating assets and liabilities differ. Compare periods only when the formula is consistent, and do not confuse it with the cash conversion cycle.
When to use it
Use it in monthly forecasts when customers buy on credit, stock is material or suppliers offer payment terms. Compare the trend with similar businesses and investigate large changes. A subscription business paid upfront with little inventory may learn more from a direct cash forecast than this ratio.