Cash Flow Calculator

What This Calculator Does

Cash flow is the movement of money in and out of your business. It is possible to be profitable on paper and still go bankrupt if cash runs out. This calculator breaks your cash flow into three categories: operating (day-to-day business activities), investing (buying or selling assets), and financing (loans, equity, dividends). It shows your net cash flow and ending cash balance so you can see whether your business is generating or burning cash.

The distinction between profit and cash flow matters because of timing. If you invoice a client for $10,000 in January but they pay in March, your January income statement shows $10,000 in revenue and looks profitable. But your cash balance has not changed. Meanwhile, you still need to pay rent, salaries, and suppliers in January. A business can be profitable and cash-flow negative at the same time, which is why this calculator is essential for planning.

For startup-specific cash management, pair this with our Burn Rate Calculator and Runway Calculator. To understand your profitability separately from cash flow, use our Margin Calculator.

Inputs Required

• Revenue: Cash received from sales
• Operating Expenses: Cash paid for day-to-day operations (salaries, rent, supplies, utilities)
• Depreciation: Non-cash expense added back to operating cash flow
• Capital Expenditures: Cash spent on equipment, property, or other long-term assets
• Financing Inflows: Cash from loans or equity investments
• Financing Outflows: Cash for loan repayments or dividend payments
• Beginning Cash Balance: Cash on hand at the start of the period

Outputs Provided

• Operating Cash Flow: Cash generated or consumed by core business operations
• Investing Cash Flow: Cash spent on or received from long-term assets
• Financing Cash Flow: Cash from or used for funding activities
• Net Cash Flow: The sum of all three categories
• Ending Cash Balance: Beginning cash plus net cash flow

How the Calculation Works

Cash flow is calculated using the indirect method, which starts with net income and adjusts for non-cash items:

Depreciation is added back because it reduces profit on the income statement but does not involve an actual cash outlay. The cash was spent when the asset was purchased, not when it is depreciated. This adjustment is what makes cash flow different from profit.

How to Use the Calculator

1. Enter your cash revenue for the period (not invoiced revenue, actual cash received)
2. Enter your operating expenses paid in cash during the period
3. Enter depreciation expense (from your income statement, added back as non-cash)
4. Enter capital expenditures (cash spent on equipment, property, or other assets)
5. Enter financing inflows (loan proceeds, equity investments) and outflows (loan payments, dividends)
6. Enter your beginning cash balance
7. Review your net cash flow and ending cash balance

Example Calculations

Example 1: Profitable Small Business

A consulting firm has $50,000 in monthly revenue, $30,000 in operating expenses, and $5,000 in depreciation. They spent $10,000 on new computers. They received $5,000 from a loan and paid $2,000 toward existing loans. Beginning cash: $20,000.

• Operating cash flow: $50,000 - $30,000 + $5,000 = $25,000
• Investing cash flow: -$10,000
• Financing cash flow: $5,000 - $2,000 = $3,000
• Net cash flow: $25,000 - $10,000 + $3,000 = $18,000
• Ending cash: $20,000 + $18,000 = $38,000

Example 2: Growing Startup

A SaaS startup has $15,000 in monthly revenue, $25,000 in operating expenses (mostly salaries), and $1,000 in depreciation. They spent $3,000 on servers. They received $50,000 from a seed round and paid no dividends. Beginning cash: $100,000.

• Operating cash flow: $15,000 - $25,000 + $1,000 = -$9,000 (burning cash)
• Investing cash flow: -$3,000
• Financing cash flow: $50,000
• Net cash flow: -$9,000 - $3,000 + $50,000 = $38,000
• Ending cash: $100,000 + $38,000 = $138,000

The startup is losing money operationally but survived because of the seed round. Without the $50,000 inflow, ending cash would have been $88,000 and the runway would be shrinking.

Real World Scenarios

The Profitable but Cash-Strapped Agency

A marketing agency shows $80,000 in monthly profit on its income statement. But clients pay on 60-day terms, so only $30,000 of cash was collected this month. Operating expenses paid in cash were $45,000. Operating cash flow is negative $15,000. The agency is profitable on paper but burning cash in reality. The solution is to accelerate collections (shorten payment terms, offer early payment discounts) or secure a line of credit to bridge the gap.

Seasonal Business Planning

A retail store does 70% of its annual revenue in November and December. From January through August, monthly operating cash flow is negative $8,000. Beginning cash in January is $60,000. Without financing, the store runs out of cash in July ($60,000 / $8,000 = 7.5 months). The owner uses the calculator to model a $50,000 line of credit drawn in April, which extends the cash position through September when holiday inventory purchasing begins. The financing inflow of $50,000 in April changes the ending cash trajectory from negative to positive through the slow months.

Investing in Growth vs. Preserving Cash

A manufacturing business generates $20,000 in monthly operating cash flow. They are considering buying a new machine for $80,000. Without the purchase, ending cash grows by $20,000 per month. With the purchase in month one, cash drops by $60,000 that month (operating $20,000 minus investing $80,000). But the new machine increases production capacity, adding $8,000 per month to operating cash flow. The investment pays for itself in 10 months ($80,000 / $8,000). The calculator shows the immediate cash impact and helps the owner confirm they have enough cash reserves to absorb the initial outflow.

Common Mistakes to Avoid

• Confusing profit with cash flow: Profit includes non-cash items like depreciation and accrued revenue. Cash flow tracks actual money moving in and out. A profitable business can fail if it runs out of cash
• Forgetting to add back depreciation: Depreciation reduces profit but does not use cash. If you subtract it from revenue without adding it back, you understate your operating cash flow
• Mixing up timing: Enter cash actually received and paid during the period, not invoiced amounts. A $50,000 invoice sent this month but paid next month belongs in next month's cash flow
• Ignoring working capital changes: Increases in accounts receivable or inventory consume cash even though they do not appear as expenses on the income statement. This calculator simplifies by using cash revenue and cash expenses directly

Limitations of This Calculator

This calculator uses a simplified cash flow model. It does not handle changes in working capital (accounts receivable, accounts payable, inventory), which are a significant part of real cash flow statements. It does not account for tax payments, which can be a major cash outflow. The depreciation add-back is simplified and does not handle amortization, stock-based compensation, or deferred taxes. For formal financial reporting, use proper accounting software or consult a CPA.

Authoritative Research & Resources

• SBA - Understanding Cash Flow Statements - The US Small Business Administration's guide to cash flow statements, explaining the three categories and how to use them for business management.
• Investopedia - Cash Flow Statement - A comprehensive reference on cash flow statements, including the indirect method, operating vs. investing vs. financing activities, and how to interpret the results.
• SCORE - How to Create a Cash Flow Statement - SCORE's practical guide for small business owners on building and using cash flow statements for decision-making.