Business Cash Flow Calculator

✓ Free online calculator · No signup · Instant results

Track your business cash flow, calculate burn rate, and forecast how long your funding will last. Pair with our ROI Calculator to evaluate project returns, or use the Startup Runway Calculator to see exactly how many months of operation your cash covers.

Calculate business cash flow and startup runway across 3 modes: Personal freelancer tracking, Freelancer income stress testing with 30% volatility, and Business burn rate with COGS/OpEx/CapEx analysis. Track how long your funding will last.

Income Sources
Expenses
Revenue Streams
Cost Structure

Operating Expenses (Breakdown)

Business Settings

What is Cash Flow?

Cash flow is the lifeblood of any business — it represents the actual money moving in and out of your accounts. For startups and businesses, understanding cash flow means knowing your burn rate (how fast you're spending capital) and runway (how long until funds run out). This calculator helps founders, freelancers, and business owners project their financial survival timeline with 12-month forecasts, stress testing, and burn rate analysis.

Understanding cash flow is fundamentally different from understanding profit. While profit is an accounting concept that includes non-cash items like depreciation or accounts receivable, cash flow reflects the actual money available to spend today. A business can show profit on paper while experiencing negative cash flow if customers pay slowly or if large inventory purchases tie up capital. For startups, cash flow management determines whether you raise another funding round or shut down operations.

This calculator offers three distinct modes for business planning: Personal mode for tracking freelancer income as a solo founder, Freelancer mode for managing irregular revenue with 30% stress testing, and Business mode for calculating burn rate, runway, and COGS/OpEx/CapEx breakdowns—critical metrics every startup founder and business owner must monitor weekly. For a simplified runway-only analysis, try our Startup Runway Calculator.

How to Use This Calculator

Start by selecting the mode that matches your situation. Personal mode is ideal for salary workers and households tracking monthly budgets. Freelancer mode adds features for income variability and buffer calculations. Business mode focuses on operational metrics like burn rate and runway.

Enter your starting cash balance—the amount currently in your accounts. Then input your time horizon (typically 12 months for planning). For Personal and Freelancer modes, add income sources with their frequency (weekly, biweekly, monthly, or yearly). The calculator automatically normalizes everything to monthly figures for comparison. Similarly, add expenses and categorize them as fixed (rent, insurance), variable (groceries, entertainment), debt payments, or irregular (annual subscriptions).

For Business mode, enter monthly revenue, cost of goods sold (COGS), operating expenses (OpEx), debt payments, and capital expenditures (CapEx). The calculator computes your net operating cash flow, burn rate (if negative), and runway (months until cash depletes). Results appear instantly, showing monthly projections, warnings for concerning patterns, and insights for improvement. Use the Advanced section to view charts, detailed tables, and scenario comparisons.

When to Use This Tool

Use this calculator when making financial decisions that depend on cash availability. For personal finances, it's essential when evaluating whether you can afford a lifestyle change—moving to a more expensive apartment, taking a lower-paying job with better work-life balance, or planning a major purchase. By projecting your cash flow over 6-12 months, you can see whether your reserves will grow or shrink under the new scenario.

Freelancers and contractors benefit from regular cash flow analysis, especially when income varies month to month. Use the Freelancer mode to calculate your 3-month rolling average income and stress-test a scenario where income drops 30%. This reveals whether your buffer is adequate or if you need to build larger reserves before taking time off or pursuing riskier projects.

For businesses, cash flow monitoring is survival-critical. Startups should track burn rate and runway weekly, ensuring they maintain 12-18 months of runway before needing additional funding. Small businesses use cash flow projections to time large purchases, plan hiring, or identify seasonal patterns. Once you know your monthly cash flow, use our Break-even Calculator to find exactly when revenue covers all costs. If you're considering a business loan, investors want to see cash flow projections demonstrating you can service debt while maintaining operations.

Examples

Example 1: Personal Budget with Positive Cash Flow

Scenario: Sarah is a software engineer earning $6,500/month after taxes. Her expenses include $1,400 rent, $400 groceries, $200 utilities, $150 insurance, $300 transportation, $400 dining/entertainment, and $250 miscellaneous costs—totaling $3,100/month.

Calculation: Monthly income ($6,500) minus monthly expenses ($3,100) equals net cash flow of +$3,400. With a starting balance of $15,000, her projected balance after 12 months is $55,800 ($15,000 + 12 × $3,400).

Analysis: Sarah has a 52% savings rate ($3,400 ÷ $6,500), indicating strong financial health. She can comfortably maximize her 401(k) contributions, build a 6-month emergency fund ($18,600), and still have surplus for investment accounts. Her positive cash flow provides flexibility to pursue career risks or handle unexpected expenses without financial stress.

Recommendation: With such healthy cash flow, Sarah should prioritize tax-advantaged accounts (401(k), IRA) and consider increasing her emergency fund to 12 months for maximum security. She could also explore real estate investment or taxable brokerage accounts.

Example 2: Freelancer with Irregular Income

Scenario: Marcus is a freelance graphic designer with highly variable income. Recent months: January $8,000, February $3,200, March $2,500, April $6,800, May $4,500. His fixed expenses are $2,800/month (rent, insurance, subscriptions), with variable expenses around $500/month.

Calculation: His 3-month rolling average (March-May) is $4,600/month. Monthly expenses total $3,300. Net cash flow averages +$1,300/month, but with significant volatility. In his worst recent month (March), income was $2,500 against $3,300 expenses—a $800 deficit.

Analysis: Marcus needs a substantial buffer to smooth income fluctuations. With 6 months of expenses equaling $19,800, he should maintain at least this amount in liquid savings. During high-income months, he should save aggressively rather than increase lifestyle spending. The stress test reveals that a string of low-income months could deplete reserves quickly.

Recommendation: Marcus should establish a business "salary" of $3,500/month from his business account to his personal account, only drawing this amount regardless of monthly earnings. Excess income stays in the business account as a buffer, smoothing personal cash flow and simplifying tax planning.

Example 3: Small Business with Negative Cash Flow

Scenario: A coffee shop generates $25,000/month in revenue but faces $28,000 in monthly expenses: $8,000 rent, $12,000 staff wages, $5,000 supplies (COGS), $2,000 utilities and insurance, and $1,000 marketing. Starting cash reserves: $50,000.

Calculation: Net operating cash flow is -$3,000/month ($25,000 revenue minus $28,000 expenses). Burn rate: $3,000/month. Runway: 16.7 months ($50,000 ÷ $3,000). At this rate, cash depletes by month 17 without intervention.

Analysis: The business is losing money despite having customers. While 16.7 months of runway provides time for adjustments, action is needed now. The owner must either increase revenue by 12% (to $28,000/month) or reduce expenses by $3,000/month to reach break-even. Waiting until runway drops below 6 months creates desperation and limits options.

Recommendation: Immediate actions: negotiate rent reduction (many landlords prefer concessions to vacancies), optimize staff scheduling to reduce overtime, switch to lower-cost suppliers, and implement targeted marketing to increase revenue. Consider raising prices 5-8%—most customers accept gradual increases. The goal is to reach break-even within 6 months, then profitability by month 9.

Tips for Better Cash Flow Management

  • Track Everything: Use budgeting apps or spreadsheets to monitor every dollar. Awareness precedes control. You can't improve cash flow without knowing where money goes. Review transactions weekly and categorize expenses to identify patterns and opportunities.
  • Build a Buffer First: Before aggressive investing or spending, establish 3-6 months of expenses in liquid savings. This emergency fund protects against income shocks (job loss, client departures) and prevents expensive last-minute borrowing. For businesses, maintain 3 months of operating expenses as working capital.
  • Automate Savings: Treat savings as a non-negotiable expense. Set up automatic transfers on payday—10-20% of income should move to savings before you see it. This "pay yourself first" approach ensures savings happen regardless of spending temptations.
  • Negotiate Fixed Expenses: Your largest expenses offer the biggest savings opportunities. Call providers annually to negotiate insurance, internet, phone, and subscription services. Refinance high-interest debt. Consider relocating if rent consumes over 30% of income. A 10% reduction in a $2,000 rent saves $2,400 annually.
  • Diversify Income Sources: Relying on a single income stream creates vulnerability. Develop side income through freelancing, consulting, rental properties, or investment dividends. For businesses, avoid dependence on one major client—losing them shouldn't threaten viability.
  • Use the 50/30/20 Rule: Allocate 50% of income to needs (housing, food, utilities), 30% to wants (entertainment, dining), and 20% to savings and debt payoff. This framework ensures balanced finances while building wealth. Adjust ratios based on personal goals—aggressive savers might use 50/20/30 or 50/15/35.

Looking for personal budget planning? If you need to track household expenses, follow the 50/30/20 rule, or set personal savings goals, try our Budget Calculator designed for personal finance and monthly budget planning.

Frequently Asked Questions

What is cash flow?
Cash flow is the movement of money in and out of your budget or business over a specific period. It shows whether you have more income than expenses (positive cash flow) or more expenses than income (negative cash flow). Unlike profit, which is an accounting concept, cash flow reflects actual money you can use. For example, a business can be profitable on paper but have negative cash flow if customers haven't paid yet. Use our Personal Mode to track your monthly cash flow, or Business Mode to calculate your company's burn rate and runway.
How do you calculate cash flow?
The basic cash flow formula is: Income - Expenses = Net Cash Flow. For personal finances, add up all your income sources (salary, freelance work, investments) and subtract all expenses (rent, groceries, debt payments). A positive result means you're saving money; negative means you're spending more than you earn. For businesses, it's similar but includes revenue, cost of goods sold (COGS), operating expenses, debt payments, and capital expenditures. Our calculator automatically normalizes different payment frequencies (weekly, monthly, yearly) to give you a clear monthly view.
What's the difference between cash flow and profit?
Profit is revenue minus expenses on paper, while cash flow is actual money moving in and out of your accounts. You can have profit without positive cash flow if customers pay late or you've invested heavily in inventory. For example, if you invoice $10,000 but customers pay in 60 days, your accounting shows profit today, but you won't have cash flow until payment arrives. Similarly, if you buy $5,000 of inventory, it reduces cash flow immediately but only affects profit when sold. Our calculator focuses on cash flow because it shows what you can actually spend today, making it more useful for budgeting and runway planning.
What is burn rate?
Burn rate is how much money your business spends per month beyond what it earns. If you earn $8,000/month in revenue but spend $12,000 on expenses, your burn rate is $4,000/month. Startups and growing businesses often operate at a burn rate while building their product or customer base. The key question is: how long can you sustain this before running out of money? That's where runway comes in. Use our Business Mode to calculate your burn rate automatically. Enter your monthly revenue and all expenses, and the calculator shows your exact burn rate and runway.
How do I calculate runway?
Runway is calculated by dividing your current cash reserves by your monthly burn rate. The formula is: Runway (months) = Cash Reserves ÷ Monthly Burn Rate. For example, if you have $50,000 in the bank and burn $5,000/month, your runway is 10 months. This tells you how long your business can operate before needing additional funding or becoming profitable. Our Business Mode calculates runway automatically and shows you a 12-month projection. This helps you plan fundraising timelines or identify when you need to cut costs or increase revenue.
Can I export my cash flow results?
Yes, you can export your cash flow analysis as a CSV file. Click the "Download CSV" button in the Advanced section to get a spreadsheet with your monthly projections, cumulative cash flow, and all income and expense details. The CSV includes columns for month, income, expenses, net cash flow, and running balance. You can open it in Excel, Google Sheets, or any spreadsheet software for further analysis, charting, or sharing with investors or financial advisors. Exported data matches exactly what you see in the calculator, ensuring consistency between your planning tool and external reports.
Is my data saved or shared?
Your data is saved locally in your browser using localStorage and is never sent to any server or shared with third parties. All calculations happen entirely in your browser, keeping your financial information private. If you use the same browser, your data will be there when you return. However, clearing browser data or using a different device will reset the calculator. For permanent records, export your results as CSV. We don't collect, store, or transmit any of your input data. The calculator works completely offline once loaded, so your financial information stays on your device.
How often should I calculate my cash flow?
For personal finances, monthly is typically sufficient. Review your cash flow at the end of each month to see if you're on track with savings goals or need to adjust spending. Freelancers with irregular income should check more frequently—weekly or biweekly—to ensure they maintain enough buffer for lean periods. Use our Freelancer Mode to account for income variability. Businesses should track cash flow weekly, especially startups with limited runway. Weekly monitoring helps catch problems early and gives you time to adjust before a crisis. Our calculator's 12-month projection helps you anticipate future cash needs.
What's a good cash flow for my situation?
For personal finances, aim for positive cash flow of at least 10-20% of your income. If you earn $5,000/month, saving $500-1,000 is a healthy target. This builds emergency funds and long-term savings. For freelancers, maintain 3-6 months of expenses as a buffer to smooth out irregular income. If your monthly expenses are $3,000, keep $9,000-18,000 in reserves. For startups, there's no single "good" burn rate—it depends on growth stage and funding. However, maintain at least 12-18 months of runway to have time for pivots or fundraising without desperation.
Why is my cash flow negative even though I have money?
Having money in the bank doesn't mean your current cash flow is positive. Cash flow measures the change over a period—if you're spending more than you earn this month, your cash flow is negative even if your account still has funds. Think of it like a bathtub: your bank balance is the water level, and cash flow is whether the faucet (income) is filling faster than the drain (expenses). You can have water in the tub while it's draining. Negative cash flow is a warning sign that you're depleting savings. Calculate how long your reserves will last at the current rate using our runway feature.
How can I improve negative cash flow?
There are two levers: increase income or reduce expenses. For personal finances, consider side income, asking for a raise, or selling unused items. On the expense side, review subscriptions, negotiate bills, or find cheaper alternatives. For freelancers, raise rates, take on more clients, or require deposits/faster payment terms. Building a buffer during good months helps smooth out lean periods. For businesses, focus on revenue growth first—cutting too much can hurt growth. However, eliminate unnecessary expenses, negotiate vendor terms, and prioritize cash-generating activities. Our scenario comparison feature helps you model different strategies.
Should I use this for personal budgeting or business accounting?
Use this calculator for cash flow planning and projections, not formal accounting. It's perfect for personal budgeting, freelance income tracking, and startup runway analysis, but doesn't replace bookkeeping software or certified accounting. For personal use, it's comprehensive—track all income and expenses, see projections, and export for tax prep. For businesses, use it alongside accounting software: your bookkeeper tracks what happened, while this calculator projects what will happen. If you need GAAP-compliant financial statements, loan applications, or tax filings, consult a professional accountant. This tool helps you make informed decisions, not audit-ready reports.
What's the difference between gross and net cash flow?
Gross cash flow is your total income before any expenses. Net cash flow is what remains after subtracting all expenses. For example, if you earn $5,000/month and spend $3,000, your gross cash flow is $5,000 and net is $2,000. Businesses often distinguish between operating cash flow (from core business), investing cash flow (from asset purchases/sales), and financing cash flow (from loans/equity). Our calculator focuses on operating cash flow for simplicity, which is most relevant for budgeting and runway planning.
How do I handle irregular income as a freelancer?
Use our Freelancer Mode, which is designed for variable income. Enter your typical monthly range, and the calculator shows scenarios for low, average, and high income months. The key strategy is building a buffer—save aggressively during high-income months to cover expenses during slow periods. Aim for 3-6 months of expenses in reserves. Track your average monthly income over 6-12 months to set realistic projections, and always budget based on your low-end estimate, not your best month.
What is free cash flow (FCF)?
Free cash flow is cash remaining after covering all operating expenses and capital expenditures (CapEx). The formula is: FCF = Operating Cash Flow - CapEx. For example, if your business generates $10,000/month in operating cash flow but needs $2,000/month for equipment upgrades, your free cash flow is $8,000. This is money available for debt repayment, distributions, or growth investments. Our calculator shows net cash flow, which is similar but focuses on monthly burn rate rather than distinguishing between operating and capital expenses.
How accurate are these projections?
Projections are only as accurate as your inputs. If you use realistic income and expense estimates based on historical data, the calculator provides reliable forecasts for planning purposes. However, unexpected events—job loss, medical emergencies, market changes—can't be predicted. Use projections as a planning tool, not a guarantee. Our scenario comparison feature helps you model best-case and worst-case outcomes. Update your inputs monthly with actual results to keep projections accurate. The calculator is a living tool, not a one-time forecast.
Can I calculate cash flow for multiple scenarios?
Yes, use the scenario save and compare feature in the Advanced section. Save your baseline scenario, then adjust inputs to model different situations—like a 20% income increase, moving to a cheaper apartment, or adding a new expense. You can save up to 5 scenarios and compare them side-by-side. This is particularly useful for decision-making: Should I take that lower-paying job with better benefits? Can I afford a car payment? How much runway do I gain by cutting this expense? Each scenario preserves all inputs and calculations, so you can revisit and refine them over time.
What's the difference between operating, investing, and financing cash flow?
Operating cash flow comes from core business activities—revenue minus operating expenses. Investing cash flow involves buying or selling assets like equipment or property. Financing cash flow comes from loans, investments, or debt repayment. For example: $50,000 revenue - $30,000 expenses = $20,000 operating cash flow. Buying $10,000 equipment = -$10,000 investing cash flow. Taking a $5,000 loan = +$5,000 financing cash flow. Total: $15,000 net cash flow. Our calculator focuses on operating cash flow since that's most relevant for budgeting and runway.
Should I include depreciation in my cash flow?
No, depreciation is a non-cash accounting expense and doesn't belong in cash flow analysis. It represents the theoretical decline in asset value over time, but no money actually leaves your account. For example, if you buy a $12,000 computer and depreciate it over 3 years, your accountant records $4,000/year depreciation expense. But the $12,000 cash outflow happened when you bought it, not gradually over 3 years. Our calculator tracks actual cash movements only. Record the full purchase price when you buy equipment, not the depreciation.
How do I calculate cash flow from a balance sheet?
Cash flow isn't directly shown on a balance sheet—you need a cash flow statement. However, you can approximate it by comparing cash balances between two periods: (Cash End of Period) - (Cash Start of Period) = Net Cash Flow. For example, if you had $20,000 cash on Jan 1 and $25,000 on Dec 31, your annual net cash flow was $5,000 (or about $417/month average). Our calculator is forward-looking—it projects future cash flow based on planned income and expenses, rather than analyzing historical balance sheets.
What's a healthy burn rate for a startup?
There's no universal "healthy" burn rate—it depends on stage, industry, and funding. Pre-revenue startups might burn $20,000-50,000/month building a product. Growth-stage companies could burn millions while scaling. The key metric is runway, not absolute burn rate. Maintain at least 12-18 months of runway to avoid desperation fundraising. If you're burning $40,000/month, you need $480,000-720,000 in reserves. Focus on burn rate efficiency: Are you burning $10k/month and growing 20% monthly? That's healthier than burning $5k and not growing.
How long should my runway be?
For startups, maintain 12-18 months minimum. Fundraising takes 3-6 months, so start when you have 18 months left, giving you 12+ months after raising. Less than 12 months creates urgency that weakens negotiating position. For personal finances, 3-6 months of expenses is standard emergency fund guidance. Freelancers should aim for 6-12 months due to income variability. Our calculator shows your runway based on current burn rate. If it's under 12 months for a business or 3 months for personal, prioritize either cutting expenses or increasing income immediately.
Can small businesses use this calculator?
Absolutely. While we use startup terminology like "burn rate" and "runway," the calculator works for any business tracking cash flow—retail stores, service providers, contractors, small manufacturers. Use Business Mode to enter revenue and expenses. The calculator shows whether you're cash flow positive or negative, and how long your reserves will last if negative. Many small businesses face seasonal cash flow challenges, and our 12-month projection helps you plan for slow periods. For simple sole proprietorships, Personal or Freelancer Mode may be sufficient if business and personal finances aren't separated.
What's the difference between cash flow and liquidity?
Cash flow measures money movement over time (income minus expenses per month). Liquidity measures how much cash or easily-convertible assets you have right now. You can have high liquidity but negative cash flow—for example, $100,000 in the bank but spending $5,000 more than you earn monthly. Eventually, you'll run out of liquidity. Conversely, you can have positive cash flow but low liquidity—earning more than you spend, but with little in reserves. Our calculator tracks both: net cash flow shows monthly movement, and the running balance projection shows liquidity over time.
What is the difference between cash flow and profit?
Profit is revenue minus expenses on paper (accrual basis), while cash flow tracks actual money moving in and out of your accounts. A business can be profitable on paper but still run out of cash if customers pay late or large investments are due. This calculator focuses on cash flow — the real money available to you each month.

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