Cash Flow Calculator: Net Cash Flow and Closing Balance
This cash flow calculator totals your business cash inflows and outflows for a period and shows net cash flow, the split between operating, investing and financing activities, and your closing cash balance.
A cash flow calculator adds up the cash coming into a business and the cash going out over a period, then subtracts one from the other to give net cash flow. Adding the opening cash balance gives the closing balance. A positive result means cash grew; a negative result means more cash was spent than collected.
Cash Flow Formula with a Worked Example
Net Cash Flow = Total Cash Inflows − Total Cash Outflows
Net Cash Flow = Operating + Investing + Financing Cash Flow
Closing Balance = Opening Balance + Net Cash Flow
Take a small business that starts the month with $15,000 in the bank. Press Load Example above to run these figures; the calculator returns the totals in this table.
| Activity | Cash in | Cash out | Net cash flow |
|---|---|---|---|
| Operating | $42,000 customer receipts | $35,000 rent, payroll and supplies | $7,000 |
| Investing | $0 | $12,000 equipment purchase | -$12,000 |
| Financing | $10,000 bank loan received | $1,500 loan repayment | $8,500 |
| Total | $52,000 | $48,500 | $3,500 |
Net cash flow is $3,500, so the closing balance is $15,000 + $3,500 = $18,500. The split shows what the total hides: cash grew only because of the loan, since $7,000 of operating cash flow did not cover $12,000 of equipment.
How This Cash Flow Calculator Works
- List each cash inflow for the period with its amount: sales receipts, loan proceeds, owner investment.
- List each cash outflow. Use cash actually paid, not bills received.
- Tag each line as operating, investing or financing. Every line starts as operating, so skip this step if you only need a simple in-and-out total.
- Enter the opening cash balance and press Calculate Cash Flow.
The result shows total inflows, total outflows, net cash flow for each activity and the closing balance. A shortfall is shown with a minus sign, for example -$5,000. This page is for business cash flow; for a rental, use the rental property cash flow calculator.
Operating vs Investing vs Financing Cash Flow
A formal cash flow statement is, in the words of the U.S. Securities and Exchange Commission, divided into three main parts, and its bottom line shows the net increase or decrease in cash for the period.
| Activity | What it covers | Examples |
|---|---|---|
| Operating | Cash received from or used in running the business | Customer receipts, payroll, rent, supplies |
| Investing | Purchases or sales of long-term assets and investment securities | Buying equipment, selling property |
| Financing | Cash raised from, or paid back to, lenders and owners | Selling stock or bonds, borrowing from a bank, repaying a loan |
Free cash flow is a related measure. SEC staff guidance describes it as cash flows from operating activities less capital expenditures and notes that it has no uniform definition. In the example above it is $7,000 − $12,000 = -$5,000.
Cash Flow vs Profit
Profit and cash flow are related but different. Profit is revenue minus expenses on an accrual basis, so it includes money you have earned but not yet received. Cash flow tracks actual money movement: when cash enters or leaves your accounts. As the SEC puts it, an income statement tells you whether a company made a profit, while a cash flow statement tells you whether it generated cash. A profitable business can still run short if customers take 90 days to pay but bills are due in 30.
Improving Your Cash Flow
To improve cash flow, speed up inflows and slow down outflows. Invoice immediately on delivery and consider an early payment discount such as 2/10 net 30. Follow up on overdue payments consistently. Negotiate longer payment terms with suppliers and review recurring subscriptions monthly. Keep a cash cushion: a JPMorgan Chase Institute study of 597,000 US small businesses found the median held only 27 cash buffer days, the number of days of outflows it could pay if inflows stopped.
Cash Flow Forecasting Tips
Forecast cash flow by projecting expected inflows and outflows month by month. Include seasonal swings and irregular payments such as annual insurance premiums, quarterly taxes and equipment replacement. Use cautious estimates for revenue and generous ones for expenses, and update the forecast as actual figures come in. A rolling 13-week forecast is a common format for short-term planning because it shows a cash shortfall weeks before it arrives.
Last updated: October 2026. Sources: SEC Beginners’ Guide to Financial Statements; SEC staff guidance on non-GAAP measures, Question 102.07; JPMorgan Chase Institute, Cash is King: Flows, Balances, and Buffer Days (2016).
Frequently Asked Questions
What is cash flow?
Cash flow is the net amount of money moving into and out of a business. Positive cash flow means more income than expenses, while negative cash flow means spending exceeds income.
How do I calculate net cash flow?
Net cash flow = Total cash inflows minus total cash outflows. Add your opening balance to get your closing cash position for the period.
What is the difference between cash flow and profit?
Profit is revenue minus expenses on an accrual basis. Cash flow tracks actual money movement. A business can be profitable but cash-poor if customers pay late.
How often should I analyze cash flow?
Review cash flow weekly for short-term planning and monthly for trends. Many businesses also keep a rolling 13-week forecast so a shortfall shows up weeks in advance.
What causes negative cash flow?
Common causes include slow-paying customers, high inventory, seasonal downturns, rapid expansion, unexpected expenses, and poor pricing that does not cover all costs.
How much cash reserve should a business have?
There is no official figure. A JPMorgan Chase Institute study of 597,000 US small businesses found the median held only 27 cash buffer days, and a quarter held fewer than 13. Size your own cushion to how uneven your income is and how quickly you could cut costs.
What is the formula for cash flow?
Net cash flow = total cash inflows - total cash outflows. On a cash flow statement the same figure is the sum of cash flow from operating, investing and financing activities. Closing cash balance = opening cash balance + net cash flow.
What is the difference between operating cash flow and free cash flow?
Operating cash flow is the cash a business generates from its day-to-day activities. Free cash flow is typically calculated as cash flows from operating activities less capital expenditures. SEC staff guidance notes that free cash flow has no uniform definition, so check how each company calculates it.