Net working capital equals your current assets minus your current liabilities. It tells you, in dollar terms, how much short-term financial cushion your business has to cover upcoming bills, fund inventory purchases, or handle unexpected expenses. The formula itself is simple, but pulling the right numbers from a balance sheet and knowing which version of the formula to use takes a bit more detail.
The Basic Formula
Start here:
- Net Working Capital = Current Assets − Current Liabilities
Current assets are anything your business can convert to cash within one year: accounts receivable (money customers owe you), inventory, prepaid expenses, cash, and short-term investments. Current liabilities are obligations due within one year: accounts payable (money you owe suppliers), accrued expenses like wages or rent, and the current portion of any loans.
If a company has $500,000 in current assets and $320,000 in current liabilities, its net working capital is $180,000. A positive number means the business can cover its short-term obligations and still have money left over. A negative number means short-term debts exceed short-term resources, which is a liquidity problem.
Where to Find the Numbers
Everything you need sits on the balance sheet. Current assets and current liabilities are each grouped into their own section, usually listed before long-term items. If you’re looking at a publicly traded company, the balance sheet appears in quarterly and annual filings. If you’re running your own business, your accounting software or bookkeeper produces one.
The most common current asset line items you’ll see are cash and cash equivalents, accounts receivable, inventory, and prepaid expenses. On the liability side, look for accounts payable, accrued expenses, short-term notes payable, and the current portion of long-term debt (the chunk of a multi-year loan that’s due within the next 12 months).
Operating Working Capital: A More Focused Version
Analysts and financial professionals often strip out cash and short-term debt to get a cleaner picture of the capital tied up in daily operations. This version is called operating working capital, and the formula looks like this:
- Operating Working Capital = Current Assets (excluding cash) − Current Liabilities (excluding debt)
A shorthand version narrows it even further:
- Operating Working Capital = Accounts Receivable + Inventory − Accounts Payable
Why exclude cash? Because cash sitting in a bank account or invested in short-term securities isn’t really “tied up” in operations the way inventory or receivables are. It’s more of an investing decision than an operating one. Similarly, short-term debt is a financing decision, not an operational one. Removing both gives you a better read on how much capital the business needs just to keep the lights on and products moving.
If you’re evaluating a company’s operational efficiency or building a financial model, use the operating version. If you just want to know whether a business can pay its bills over the next year, the basic formula works fine.
How to Calculate the Change in Working Capital
Knowing your working capital at a single point in time is useful, but tracking how it changes from one period to the next tells you whether the business is becoming more or less efficient with its short-term resources. The formula is:
- Change in NWC = Prior Period NWC − Current Period NWC
This matters because the change in working capital shows up on the cash flow statement. When working capital increases (say, because you’re carrying more inventory or customers are paying more slowly), that ties up cash. On a cash flow statement, an increase in working capital is a use of cash. When working capital decreases (you’re collecting receivables faster or negotiating longer payment terms with suppliers), that frees up cash.
For example, if your operating working capital was $200,000 last quarter and $250,000 this quarter, the change is negative $50,000. That means $50,000 more cash got absorbed into operations this period. Even if your revenue grew, your actual cash position tightened because more money is sitting in inventory or unpaid invoices.
A Worked Example
Suppose your balance sheet shows the following:
- Cash: $60,000
- Accounts receivable: $150,000
- Inventory: $90,000
- Prepaid expenses: $10,000
- Accounts payable: $80,000
- Accrued expenses: $40,000
- Current portion of long-term debt: $25,000
Basic net working capital: ($60,000 + $150,000 + $90,000 + $10,000) − ($80,000 + $40,000 + $25,000) = $310,000 − $145,000 = $165,000.
Operating working capital (excluding cash and debt): ($150,000 + $90,000 + $10,000) − ($80,000 + $40,000) = $250,000 − $120,000 = $130,000.
Both numbers are positive, which is a good sign. The $35,000 gap between them represents the net effect of cash holdings and debt payments, neither of which reflects the core operating cycle.
Working Capital vs. the Current Ratio
You’ll sometimes see people reference the current ratio alongside working capital. The current ratio uses the same inputs but divides instead of subtracting:
- Current Ratio = Current Assets ÷ Current Liabilities
Using the example above, the current ratio would be $310,000 ÷ $145,000 = 2.14. That means the business has $2.14 in current assets for every $1.00 in current liabilities.
The dollar figure and the ratio serve different purposes. Working capital in dollars helps you make day-to-day decisions: can you afford to place a large inventory order, cover a surprise tax bill, or pay suppliers early to capture a discount? The current ratio is better for comparisons, because the dollar amount doesn’t scale. A $100,000 working capital cushion might be plenty for a small consulting firm but dangerously thin for a manufacturer with millions in monthly expenses. A ratio of 2.0 means the same thing regardless of the company’s size, which makes it more useful when benchmarking against competitors or reporting to lenders.
What the Number Tells You
A positive net working capital figure means a business has enough short-term assets to cover short-term obligations. Generally, the higher the number, the more financial flexibility the company has. But context matters. A very high working capital figure could also mean the company is sitting on too much inventory or isn’t collecting receivables quickly enough, both of which tie up cash that could be put to better use.
Negative working capital isn’t always a crisis. Some businesses, particularly large retailers, operate with negative working capital by design. They collect cash from customers before they have to pay suppliers, so they can function with current liabilities exceeding current assets. For most businesses, though, persistently negative working capital signals trouble meeting short-term obligations.
Tracking the trend over several quarters gives you more insight than any single snapshot. If working capital is shrinking period over period while revenue stays flat, the business may be stretching its short-term resources thinner than it should.