Transparent method
The formula
Worked example
Example inputs
How to interpret the result
A business pays for inputs and labor before customers pay it, and the working capital requirement is the cash tied up in that gap. With $2.4 million of yearly operating costs, that is about $6,575 a day, and a 45 day cash conversion cycle ties up about $295,890. After $100,000 of available credit, the business needs about $195,890 of its own cash. Shortening the cycle by a few days frees cash without borrowing.
Before you rely on it
What to check
Measure your real cycle from cash out to cash in, including slow payers, and update it seasonally. A single average hides the peak need.
The common error
Where people go wrong with working capital requirement calculator
Sizing the credit line to the average cycle. Growth lengthens the cycle and raises daily costs at once, so the requirement can rise faster than sales.
Sensitivity evidence
How annual cash operating costs changes the estimated working-capital need
| Annual cash operating costs | Estimated working-capital need | Gross cash tied in cycle | Daily operating cost |
|---|---|---|---|
| $1,920,000 | $136,712 | $236,712 | $5,260 |
| $2,160,000 | $166,301 | $266,301 | $5,918 |
| $2,400,000worked example | $195,890 | $295,890 | $6,575 |
| $2,640,000 | $225,479 | $325,479 | $7,233 |
| $2,880,000 | $255,068 | $355,068 | $7,890 |
Every input, tested
Which input moves the estimated working-capital need most
| Input | Tested from | To | Estimated working-capital need at each end | Swing |
|---|---|---|---|---|
| Annual cash operating costs | $2,160,000 | $2,640,000 | $166,301 to $225,479 | $59,178 (30%) |
| Cash conversion cycle | 41.0 days | 50.0 days | $169,589 to $228,767 | $59,178 (30%) |
| Available operating credit | $90,000 | $110,000 | $205,890 to $185,890 | $20,000 (10%) |
Two variables at once
Estimated working-capital need by annual cash operating costs and cash conversion cycle
| Annual cash operating costs \ Cash conversion cycle | 36.0 days | 45.0 days | 54.0 days |
|---|---|---|---|
| $1,920,000 | $89,370 | $136,712 | $184,055 |
| $2,160,000 | $113,041 | $166,301 | $219,562 |
| $2,400,000 | $136,712 | $195,890 | $255,068 |
| $2,640,000 | $160,384 | $225,479 | $290,575 |
| $2,880,000 | $184,055 | $255,068 | $326,082 |
Step by step
The worked example, input by input
| Input | Value used |
|---|---|
| Annual cash operating costs | $2,400,000 |
| Cash conversion cycle | 45.0 days |
| Available operating credit | $100,000 |
| Estimated working-capital need | $195,890 |
| Gross cash tied in cycle | $295,890 |
| Daily operating cost | $6,575 |
Where the inputs come from
Annual cash operating costs are the cash costs of running the business, excluding depreciation and other non-cash items. The cash conversion cycle is the number of days between paying for inputs and collecting from customers, which you can compute on the cash conversion cycle page. Available operating credit is any supplier credit or line of credit you can draw on. The daily cost is annual costs divided by 365.
When the result stops applying
The estimate assumes steady daily costs and one average cycle length, whereas seasonality and lumpy orders raise the peak need above the average. It ignores capital expenditures and debt repayments. A line of credit is not permanent capital and can be reduced by the lender. Fast growth can outrun the estimate.
What to compare it with
Find the cycle with the cash conversion cycle calculator, and see the working capital and current ratio pages for the balance sheet view. The burn rate page shows runway for businesses with negative cash flow. The business loan payment calculator sizes the repayment if you borrow to fund the gap.
People also ask
Frequently asked questions
Why does growth increase working capital needs?
More sales mean more inventory and receivables to finance before the cash comes in, so a fast-growing business can run short of cash even while profitable.
How can I reduce the requirement?
Shorten the cycle: collect faster, hold less inventory, and negotiate longer supplier terms. Each day removed frees a day of operating costs.
Should I use a line of credit or a term loan?
A line of credit suits changing needs that rise and fall with the season, while a term loan suits permanent needs such as equipment or a lasting increase in working capital.