Cash Flow Calculator

Calculate business cash flow, free cash flow, burn rate, and runway. Includes quarterly analysis, 12-month forecast, and full operating/investing/financing breakdown.

Monthly Cash Flow
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Annual Cash Flow —
Cash Flow Margin —
Extended More scenarios, charts & detailed breakdown ▾
Monthly Cash Flow
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Cash Flow Margin —
Annualized Cash Flow —
Professional Full parameters & maximum detail ▾

Operating Cash Flow

Gross Profit —
Operating Cash Flow —

Free Cash Flow & Net

Free Cash Flow —
Net Cash Flow (after financing) —

Liquidity & Risk

Monthly Burn Rate (if negative) —
Cash Runway (months) —
Cash Flow to Debt Ratio —

How to Use This Calculator

  1. Enter your monthly revenue and monthly expenses to instantly see cash flow and margin.
  2. Use the Quarterly tab to input three different months of revenue and expenses.
  3. Use the Cash Flow Forecast tab to project 12 months forward with growth rates.
  4. The Professional tier breaks down operating, investing, and financing cash flows with burn rate and runway analysis.

Formula

Operating Cash Flow = Gross Profit − Operating Expenses
Free Cash Flow = Operating CF − CapEx
Net Cash Flow = Free CF − Loan Payments
Runway = Cash on Hand ÷ Monthly Burn Rate

Example

Example: Revenue $50,000, COGS $20,000, Opex $15,000. Gross Profit = $30,000. Operating CF = $15,000. Less CapEx $5,000 = Free CF = $10,000/month. Annual FCF = $120,000.

Frequently Asked Questions

  • Cash flow is the net amount of cash moving in and out of a business. Positive cash flow means more cash is coming in than going out. Negative cash flow means you're spending more than you earn and need external funding or reserves.
  • Free Cash Flow = Operating Cash Flow − Capital Expenditures. It represents cash available after maintaining and investing in the business. Positive FCF means the business generates surplus cash it can use for debt repayment, dividends, or growth.
  • Cash runway is how many months a business can operate at its current burn rate before running out of cash. Formula: Cash on Hand ÷ Monthly Net Burn Rate. Most startups aim to maintain at least 12–18 months of runway.
  • Cash Flow to Debt = Annual Operating Cash Flow ÷ Total Debt. A ratio above 0.2 (20%) is generally considered healthy. It measures how quickly a business can repay its debt from operations.
  • Profit is an accounting concept (revenue minus expenses on an accrual basis). Cash flow is actual cash in and out. A business can be profitable but cash-flow-negative if customers pay slowly or inventory builds up. Cash flow is usually more critical for day-to-day operations.

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