Cash Flow Calculator

How to Use

Enter your beginning cash balance, total cash inflows (money actually received), and total cash outflows (money actually paid out) for the period. The calculator shows net cash flow (inflows minus outflows) and the resulting ending balance, updating live as you type. The Status indicator gives an instant positive/negative read on the period, useful as a quick health check before digging into the actual numbers.

Why Cash Flow Is a Different Question Than Profit

Cash flow and profit both describe financial performance, but they answer genuinely different questions. Profit is an accounting figure calculated using rules that include non-cash items, depreciation on equipment you already bought, revenue recognized on a sale even if the customer hasn't paid yet, expenses accrued but not yet disbursed. Cash flow strips all of that away and tracks only money that has actually moved into or out of a bank account during the period. This distinction is exactly why a business can report a healthy profit on its income statement while simultaneously struggling to make payroll, the profit is real on paper, but the cash to cover it hasn't arrived yet.

Worked Example: A Negative Cash Flow Period

Using this tool's own defaults, a beginning cash balance of 200,000, total inflows of 150,000, and total outflows of 180,000. Net cash flow is inflows minus outflows: 150,000 − 180,000 = −30,000, a negative period, meaning more cash left the business than came in. Ending balance still starts from the beginning balance and adds that net figure: 200,000 + (−30,000) = 170,000. Even though this period was cash-flow-negative, the business still ends with a healthy 170,000 balance, because it started from a comfortable cushion, this is exactly the distinction between "a negative period" and "a cash crisis," the former is common and often fine, the latter only happens when negative periods persist long enough to actually deplete the balance to zero.

Reading the Three Numbers Together, Not in Isolation

None of the three figures this tool produces, net cash flow, ending balance, and status, tells the full story alone. A negative net cash flow with a large beginning balance (like the worked example above) is a very different situation from the same negative net cash flow against a thin beginning balance close to zero, the first has runway to absorb it, the second is genuinely urgent. Always read the ending balance in the context of ongoing fixed obligations, if the ending balance barely covers the next period's rent and payroll, a single additional negative period could become a real liquidity problem even if this period's numbers look fine on their own.

Using This Tool for Forward-Looking Cash Planning

Beyond reviewing a period that's already happened, this same calculator works just as well for forward planning, plug in your current cash balance as the beginning figure, and realistic projected inflows and outflows for an upcoming month or quarter, to see whether the projected ending balance stays comfortably positive or dips into risky territory. Running this forward-looking version repeatedly across several future periods, updating each period's beginning balance with the prior period's projected ending balance, is a simple but effective way to build a rolling cash runway projection without needing a full spreadsheet model.

Common Mistakes When Estimating Cash Flow

The most frequent mistake is entering revenue figures instead of actual cash received, especially for businesses that extend credit terms or invoice customers on delay, revenue earned this month and cash actually collected this month can be very different numbers, and mixing them up defeats the entire purpose of a cash-focused calculation. A second mistake is forgetting irregular but predictable outflows, annual insurance premiums, quarterly tax payments, equipment maintenance, that don't happen every period but still need to be accounted for in whichever period they actually hit. A third is treating a single healthy period's ending balance as evidence of long-term stability, one good month doesn't offset a pattern of persistently negative cash flow if it isn't checked again the following period.

Frequently Asked Questions

What's the difference between cash flow and profit?

Profit is an accounting measure that includes non-cash items like depreciation and credit sales not yet collected. Cash flow tracks actual money moving in and out. A business can be profitable on paper but still run out of cash if customers pay slowly.

What counts as a cash inflow or outflow?

Inflows are money actually received, customer payments, loans received, or asset sales. Outflows are money actually paid out, supplier payments, payroll, rent, loan repayments, or equipment purchases. Only real cash movements count, not invoiced but unpaid amounts.

Can a business have negative cash flow but still be healthy?

Yes, in some circumstances. A growing business deliberately investing cash into inventory, equipment, or hiring ahead of expected future revenue can post negative cash flow for a period while remaining fundamentally sound, provided it has enough beginning balance or financing to sustain that gap. The concerning scenario isn't a single negative period, it's negative cash flow that persists without a clear plan for when inflows will catch up, combined with a shrinking cash balance that eventually hits zero.

Why is cash flow considered more urgent to monitor than profit?

Because a business runs out of cash in real time, not on an accounting timeline. A profitable business on paper can still fail to pay its rent or payroll this month if its actual cash inflows lag behind when expenses are due, a timing mismatch profit figures don't directly capture. This is why cash flow is often checked weekly or monthly even at businesses that only calculate formal profit quarterly or annually, running out of cash is an immediate, operational crisis in a way a temporarily thin profit margin usually isn't.

What's the difference between operating, investing, and financing cash flow?

Formal cash flow statements typically split cash movement into three categories: operating (day-to-day business activity, customer payments, supplier payments, payroll), investing (buying or selling long-term assets like equipment or property), and financing (loans, investor funding, dividend payments). This calculator works with simple total inflows and outflows across any combination of these, for a category-by-category breakdown you'd need to total each category separately before entering the figures here.

How often should a business run a cash flow calculation like this?

It depends on the business's cash position and volatility, businesses with thin cash reserves or highly seasonal revenue often benefit from checking weekly or even daily, while more stable, well-capitalized businesses might only need a monthly review. The general principle is to check more frequently the closer the ending balance sits to zero, since that's exactly the situation where an unexpected outflow or delayed inflow could cause a real cash shortfall with little warning.