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Working Capital Requirement Calculator

Enter revenue and your inventory, receivable and payable days to find working capital needs.

How it is calculated

The tool first builds the cash conversion cycle in days: CCC = DIO + DSO − DPO, where DIO is the days stock stays in inventory, DSO the days customers take to pay and DPO the days you take to pay suppliers. Then it applies that cycle to sales per day: WCR = CCC ÷ 365 × annual revenue. The same revenue figure is used as a stand-in for operating cost, so DIO and DPO are valued at the sales rate rather than at cost of goods sold; this tends to overstate the part tied up in stock and payables if your gross margin is large. Revenue must be above zero. A negative CCC (suppliers paid later than stock and customers turn into cash) gives a negative WCR, meaning suppliers fund the operations. A 365-day year is used. Daily sales are shown too.

Worked example

A business has annual revenue of 2,400,000, holds stock for 45 days, collects from customers in 38 days and pays suppliers in 30 days. CCC = 45 + 38 − 30 = 53.0 days. Daily sales = 2,400,000 ÷ 365 = $6,575.34. WCR = 53 ÷ 365 × 2,400,000 = $348,493.15. This is roughly the cash the business needs to keep running between paying for inputs and getting paid. Paying suppliers in 50 days instead of 30 would cut the cycle to 33 days and the requirement to about $217,000.

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Common mistakes

  • Entering days as months or weeks. The three inputs are days; a 2-month receivable period is 60, not 2.
  • Entering monthly or quarterly revenue. The tool divides by 365, so revenue must be for the whole year; monthly sales give a figure 12 times too small.
  • Putting the DPO in with a minus sign. The tool already subtracts it; entering a negative would add it instead.
  • Treating the result as the loan you need. It is a point estimate based on average days, and seasonality, growth and safety stock can push the real peak far higher.
  • Mixing the day counts from different bases. DIO and DPO are usually measured against the cost of goods sold, while the tool applies them to revenue; if you compute those days from costs, the stock and payables parts of the result will differ from a cost-based calculation.

Sources

About this calculator

The working capital requirement (WCR) is the cash a business needs to fund the gap between paying its suppliers and collecting from its customers, driven by the cash conversion cycle: Days Inventory Outstanding + Days Sales Outstanding − Days Payable Outstanding. This calculator applies that cycle-day figure to daily revenue (annual revenue ÷ 365) to estimate how much cash is tied up in operations at any given time.

CFOs, financial analysts and small-business owners use WCR to plan short-term financing needs — a growing company with a long cash conversion cycle (holding inventory a long time, offering generous customer payment terms, but paying suppliers quickly) can be profitable on paper yet run out of cash, which is exactly the scenario WCR is designed to flag before it becomes a liquidity crisis. Lenders also use it when structuring a revolving credit facility sized to a business's actual operating cycle rather than a flat percentage of revenue.

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Comments (1)

  • Editorial team

    The daily sales figure shows how big each lever is: every day taken off the cycle releases one day of sales. With the default 1,000,000 of revenue that is 2,739.73 per day, so cutting collection time from 45 to 40 days frees about 13,699 of cash. The same arithmetic applies to stretching supplier terms by a day. Which lever can you realistically move in your business: stock days, customer terms or supplier terms?

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