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Working capital is the fuel that keeps your business running between the moment you pay for inventory or labor and the moment customers pay you back. Knowing how to calculate it accurately, and more importantly how to project it forward, is one of the most practical financial skills a business owner can develop. The formula itself is simple: current assets minus current liabilities. But applying it correctly, with realistic numbers and a forward-looking lens, takes a bit more work.
This guide walks through the working capital formula step by step, explains what your ratio means, and shows you how to project 90 days ahead so you can see cash gaps coming before they arrive. We also cover what to do when your calculation reveals a shortfall.
Working Capital Formula: Current Assets Minus Current Liabilities
The working capital formula is straightforward: Working Capital = Current Assets − Current Liabilities. Current assets are resources your business expects to convert to cash within 12 months. That includes cash and cash equivalents, accounts receivable, inventory, and prepaid expenses. Current liabilities are obligations due within 12 months, including accounts payable, short-term loan payments, accrued wages, and sales tax payable.
Here is a worked example. Suppose your balance sheet shows the following: cash of $18,000, accounts receivable of $34,000, inventory of $22,000, and prepaid expenses of $4,000. Your total current assets are $78,000. On the liability side, accounts payable totals $28,000, short-term loan payments due this year are $12,000, and accrued wages are $7,000, giving total current liabilities of $47,000. Subtract: $78,000 − $47,000 = $31,000 in working capital.
That $31,000 represents the cushion you have to absorb unexpected costs, fund growth, or cover a slow collection month. Whether $31,000 is enough depends entirely on your revenue scale and the timing mismatches in your business, which is where the ratio comes in.
Interpreting Your Working Capital Ratio
The working capital ratio (also called the current ratio) is simply current assets divided by current liabilities. Using the example above: $78,000 ÷ $47,000 = 1.66. That sits comfortably in the healthy range of 1.5 to 2.0, meaning for every dollar of short-term debt you have $1.66 in short-term assets to cover it.
A ratio below 1.0 means current liabilities exceed current assets. You owe more in the next 12 months than you can cover with existing liquid resources. That is a yellow flag, and sometimes a red one depending on how quickly liabilities come due. Ratios above 2.0 are not automatically good either; they can signal that cash is sitting idle rather than being deployed in inventory or growth.
Industry benchmarks vary significantly. Retail businesses with fast inventory turnover can often operate comfortably at 1.2 to 1.5 because cash comes in quickly. Service businesses with long invoice cycles may want to stay closer to 2.0 or higher as a buffer. Construction and government contractors, who often wait 60 to 90 days to get paid on large jobs, sometimes need ratios of 2.5 or above to stay solvent. Know your industry's standard before judging your own number.
Project 90 Days Forward to Catch Shortfalls Early
A balance sheet snapshot tells you where you stand today. It does not tell you where you will be when a $40,000 tax payment is due in six weeks or when your largest client takes 75 days to pay an invoice. That is why projecting working capital 90 days forward is so valuable, and why most business finance advisors recommend it as a monthly habit.
Start with your current working capital figure. Then add expected cash inflows for each of the next three months: projected revenue collections based on your typical payment timing, any loan disbursements already approved, and other known incoming cash. Next, subtract expected outflows: payroll, rent, inventory purchases, loan payments, estimated taxes, and any large one-time expenses you know are coming. Run this month by month and you will see a forward-looking working capital line for months one, two, and three.
Here is a quick example. You have $31,000 in working capital today. Month one you collect $55,000 and spend $60,000, ending at $26,000. Month two you collect $48,000 and spend $52,000, ending at $22,000. Month three a $15,000 quarterly insurance premium hits and a slow collection month brings in only $40,000 against $58,000 in expenses, dropping you to a projected -$1,000. That third month is the warning. Without the projection you would not see it coming until you were already in the red. With the projection you have 60 days to act: accelerate a receivable, delay a discretionary purchase, or arrange a short-term credit line before you need it.
Adjustments for Seasonal and High-Growth Businesses
The standard formula and ratio benchmarks assume relatively steady cash flow. Many businesses, especially seasonal ones, face months where incoming cash drops sharply while fixed costs stay constant. A landscaping company in January, a retailer the week after the holiday rush, or a tax preparer in August all face this pattern. For these businesses, the working capital calculation needs to account for the trough, not just the annual average.
A practical adjustment: instead of projecting 90 days forward from today, also project through your known slow season. If your slow season runs three months and your average monthly operating expenses are $45,000, you need at least $135,000 in accessible liquidity (cash plus available credit) to bridge that period without disrupting operations. That is your seasonal working capital target, and it is often much larger than what a simple balance sheet calculation would suggest.
High-growth businesses face a different version of the same problem. When revenue grows rapidly, so does the cash tied up in inventory and receivables before customers pay. A business that doubles revenue in 12 months can actually become cash-flow negative even while it is highly profitable on paper. If your working capital ratio is falling quarter over quarter despite strong sales, that is a growth-capital signal. It means your business is healthy but needs more fuel to keep scaling.
What to Do When Your Calculation Shows a Shortfall
If your working capital projection reveals a gap, the first step is to quantify it precisely: how large is the shortfall, and when exactly does it occur? A $20,000 gap in month two is a very different problem than a $5,000 gap in month eight. Knowing the size and timing lets you choose the right solution.
On the operational side, you can shorten your receivables cycle by invoicing faster, offering small early-payment discounts, or using invoice factoring. You can lengthen your payables cycle by negotiating net-60 terms with suppliers. You can reduce inventory held on hand if carrying costs are large. These moves adjust your working capital without adding any debt.
When operational adjustments are not enough, or when the shortfall is too large or too soon to close organically, financing fills the gap. A business line of credit is the most flexible tool because you only draw and pay interest on what you use. Short-term working capital loans provide a lump sum quickly. Invoice financing turns unpaid receivables into immediate cash. The right choice depends on whether your shortfall is recurring (line of credit fits better) or one-time (a term loan often makes more sense).
How TurboFunding Helps
Once your working capital calculation shows a gap, acting quickly matters. TurboFunding connects small business owners with working capital financing from $10,000 to $5,000,000, with a 3-minute application and a soft credit pull that does not affect your score. The minimum requirements are a 550+ FICO score, at least $10,000 in monthly revenue, and six or more months in business. Whether you need a short-term loan to cover a seasonal trough, a line of credit to smooth out receivable timing, or growth capital to fund expanding inventory, TurboFunding can match you with an option suited to your numbers. If your 90-day projection is showing a cash gap on the horizon, the right time to apply is before the gap arrives, not after. Find out More
Frequently Asked Questions
Q. What is the working capital formula?
A. Working capital equals current assets minus current liabilities. Current assets include cash, receivables, inventory, and prepaid expenses. Current liabilities include accounts payable, short-term loan payments, accrued wages, and other obligations due within 12 months.
Q. What is a good working capital ratio?
A. A ratio between 1.5 and 2.0 is generally considered healthy. Below 1.0 means current liabilities exceed current assets, which can indicate cash flow stress. Above 2.0 is usually safe but may suggest idle cash that could be deployed more productively.
Q. How do I project working capital 90 days forward?
A. Start with your current working capital balance. Add expected cash inflows (collections, loan disbursements, other income) and subtract expected outflows (payroll, rent, inventory, loan payments, taxes) for each of the next three months. The resulting month-by-month balance shows where shortfalls will occur and how large they will be.
Q. Why would my working capital be negative even when my business is profitable?
A. Profit is an accounting concept; cash flow is a timing concept. A business can be highly profitable on paper while cash is tied up in unpaid invoices or inventory sitting on shelves. Rapid growth often causes this because rising sales increase receivables and inventory faster than cash comes in. This is called a working capital gap, and it is common in fast-growing businesses.
Q. How much working capital should I keep on hand?
A. A common rule of thumb is to keep enough liquid working capital to cover one to three months of operating expenses, adjusted for your industry's payment cycle and any known seasonal troughs. Businesses with unpredictable cash flow or long receivable cycles should aim for the higher end of that range.
Calculating your working capital accurately, and projecting it forward rather than just reading today's snapshot, gives you the visibility to manage cash proactively instead of reacting to crises. The formula is simple; the discipline to run it monthly and act on the results is what separates businesses that thrive from those that scramble. If your projection reveals a gap you cannot close on your own, financing is a practical tool, and the earlier you apply, the better your options. Find out More