Free tool

Startup Runway Calculator

How many months until you run out of cash? Enter your numbers to see your runway, your zero-cash date, and how far startup credits could stretch it. Free, no signup, nothing leaves your browser.

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Your numbers

Cash in the bank

Everything you could spend: bank accounts + treasury.

Monthly expenses (gross burn)

Payroll, cloud, software, rent — total cash out per month.

Monthly revenue

Cash actually collected per month. Zero is fine.

Monthly revenue growth

Optional. Month-over-month growth, compounded in the projection.

Runway

—

Zero-cash date

—

Net burn

—

per month

Projected cash balance

Extend it without dilution

We track 43 startup credit programs worth a combined $2.2M+ — free money that offsets the cloud, AI, and software spend already inside your burn.

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How runway is calculated

Gross burn is your total monthly spend — payroll, cloud, software, rent. Net burn is what actually leaves the bank each month after revenue: net burn = monthly expenses − monthly revenue.

With flat revenue, runway is simple division: runway (months) = cash ÷ net burn. If you add monthly revenue growth, this calculator projects month by month instead — revenue compounds, net burn shrinks, and your runway is the month your cash crosses zero. If growing revenue overtakes expenses before the cash runs out, you're default alive: you reach profitability without needing to raise.

The number is only as honest as its inputs. Use real bank-account cash (not committed-but-unsigned checks), your average spend over the last 3 months (not your best month), and collected revenue (not bookings or ARR ÷ 12 if customers pay late).

Startup runway FAQs

How do I calculate my startup’s runway?

Divide your cash in the bank by your monthly net burn (monthly expenses minus monthly revenue). $500K in cash with $45K in expenses and $10K in revenue is $500K ÷ $35K ≈ 14 months of runway. If your revenue is growing, project month by month instead — this calculator does that automatically.

What is the difference between gross burn and net burn?

Gross burn is your total monthly spend — payroll, cloud, software, rent. Net burn is what actually leaves the bank after revenue: expenses minus collected revenue. Runway is always calculated on net burn, but investors look at both, because gross burn shows the true size of your cost base.

How many months of runway should a startup have?

The common rule of thumb is 18–24 months after a raise, and most founders start the next fundraise with 9–12 months left, since a round typically takes 3–6 months to close. Under 6 months of runway means fundraising from a weak position — act before you get there.

How can I extend runway without raising money?

Three levers: cut expenses, grow revenue, or offset costs with non-dilutive programs. Startup credits from AWS, Google Cloud, Microsoft, Anthropic, OpenAI and others can absorb six figures of cloud and software spend — the major cloud programs alone are worth over $600K — without touching your cap table.

Does this calculator store my financial data?

No. All calculations run in your browser — nothing you type is sent to our servers or stored anywhere.