Working Capital Calculator
Calculate working capital and current ratio to measure operational liquidity.
What this calculator does
This working capital calculator measures the buffer between what a business owns short term and what it owes short term. Enter current assets and current liabilities, and it returns working capital in dollars along with the current ratio — the same relationship expressed as a multiple rather than an amount.
The dollar figure and the ratio answer different questions. Working capital tells you the absolute cushion available to absorb a slow month or fund a large order. The current ratio tells you the proportion, which is what makes it comparable across businesses of different sizes and what lenders write into covenants.
When to use it
The most important use is before accepting growth. A large new contract or a step change in volume consumes working capital before it produces profit, and businesses fail this way far more often than they fail from lack of demand. Calculate the gap before signing, not after.
It is also the right tool for a seasonal build, where inventory purchases and the receivables that follow can consume the entire cushion at exactly the point in the year when you have least flexibility. And it is what to check ahead of a covenant test date, since both inventory and receivables growth move the ratio in ways that are easy to miss month to month.
Understanding the inputs
Current assets are everything convertible to cash within twelve months: cash, marketable securities, accounts receivable net of doubtful accounts, inventory, and prepaid expenses. Be honest about receivables and inventory quality — an aged receivable and obsolete stock both count at full value on the balance sheet and at much less in reality.
Current liabilities are everything due within twelve months: accounts payable, accrued expenses and payroll, taxes payable, the current portion of long-term debt, and any drawn line of credit. The current portion of long-term debt is the item most often overlooked, and for a business carrying a term loan it can be substantial.
How is this calculated?
Working Capital = Current Assets − Current Liabilities. Current Ratio = Current Assets / Current Liabilities.
A worked example
A business holds $990,000 of current assets against $480,000 of current liabilities, giving working capital of $510,000 and a current ratio of 2.06 — comfortable by conventional standards.
Now look at how that capital is trapped. With 52 days of receivables, 61 days of inventory, and 35 days of payables, the cash conversion cycle is 78 days. On $4.2 million of annual revenue, that is about $900,000 of cash locked in the operating cycle. Taking 15 days out — faster collections and tighter stock — would release roughly $173,000 permanently, more than most businesses could borrow at a sensible rate.
Limitations and assumptions
The calculation is a snapshot and assumes every current asset is genuinely convertible. Aged receivables and obsolete inventory both sit at full book value while being worth considerably less, so two businesses with identical working capital can be in very different positions.
It also says nothing about timing within the year, so a healthy figure can coexist with a payroll you cannot meet next Friday. It ignores undrawn credit facilities and can be flattered by deferring supplier payments across a reporting date. Read it alongside a receivables aging report, an inventory aging report, and a rolling thirteen-week cash forecast.
Common Questions
- What is adequate working capital?
- A current ratio between 1.5 and 2.0 is generally healthy for most businesses. Below 1.0 means short-term obligations exceed short-term assets, which is a warning sign. Above 3.0 often means capital is sitting idle in receivables or inventory rather than being deployed, so more is not automatically better.
- Why do growing businesses run short of cash?
- Because growth consumes working capital before it produces profit. Every new order means buying inventory and paying staff weeks before the customer pays. Growing 30 percent typically requires roughly 30 percent more working capital, which has to be funded from somewhere — and profit alone rarely arrives fast enough.
- What is the cash conversion cycle?
- Days of inventory plus days of receivables minus days of payables. It measures how long your cash is tied up between paying a supplier and collecting from a customer. A 78-day cycle on $4.2 million of revenue means roughly $900,000 permanently locked in the business rather than in the bank.
- Can working capital be negative and the business still be healthy?
- Yes, and some of the strongest business models run that way deliberately. Supermarkets and restaurants collect from customers immediately while paying suppliers on 30 or 60 day terms, so customers effectively finance operations. Negative working capital is only dangerous when it results from distress rather than from the model.
- How do I free up working capital without borrowing?
- Attack the cycle from three sides: invoice immediately and chase overdue accounts, reduce slow-moving inventory even at a discount, and negotiate longer supplier terms. Ten days off the cash conversion cycle typically releases about a third of a month's revenue permanently, with no interest cost attached.
- Does a line of credit count as working capital?
- The drawn balance sits in current liabilities and reduces working capital; the undrawn portion does not appear at all. That means a business with a large unused facility is more liquid than the number implies. Report available credit alongside working capital rather than relying on the balance sheet figure alone.
- How much working capital do I need for a large new contract?
- Calculate the gap directly: materials plus labor spent before payment arrives, multiplied by the time until you collect. A contract that requires $200,000 of spending over 90 days before a single payment needs $200,000 of funding, and winning it without arranging that is how profitable businesses fail.
- What is the difference between working capital and cash flow?
- Working capital is a balance sheet position at a point in time; cash flow is movement over a period. A business can hold healthy working capital and still miss payroll if the assets are receivables due next month. Working capital measures capacity, cash flow measures timing, and you need both.
- Do lenders set working capital covenants?
- Frequently, either as a minimum current ratio or a minimum dollar amount of working capital. Breaching it is an event of default even when payments are current. Since inventory build and receivables growth both move the ratio, seasonal businesses should check headroom before their peak rather than during it.