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Startup Burn Rate Calculator

Calculate your startup's gross burn rate, net burn rate, and cash runway in months. Know exactly when you need to raise your next round, cut costs, or reach profitability — using real-time inputs for cash balance, monthly expenses, and monthly revenue.

Company Finances

Enter your current cash and monthly metrics to calculate runway.

$
$

This is your "Gross Burn" rate.

$

Cash coming in from customers.

Caution (6–12 Months)

Cash Runway

10.0 Months
Time until cash reaches zero
Gross Burn (Expenses):-$150,000/mo
Revenue:+$50,000/mo
Net Burn Rate:$100,000/mo
Cash Balance:$1,000,000
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What is Startup Burn Rate & Runway?

Burn Rate measures how quickly an unprofitable company is spending its venture capital to finance overhead before generating positive cash flow from operations. It is paired with "Runway" — the amount of time in months before the company goes bankrupt if revenue and expenses stay constant.

Mathematical Foundation

Net Burn=Monthly Expenses−Monthly Revenue\text{Net Burn} = \text{Monthly Expenses} - \text{Monthly Revenue}
Gross Burn\text{Gross Burn}= Total Monthly Expenses (salaries, rent, SaaS tools, marketing)
Net Burn\text{Net Burn}= The actual amount of cash leaving the bank account each month taking revenue into account
Runway=Current Cash BalanceNet Burn\text{Runway} = \frac{\text{Current Cash Balance}}{\text{Net Burn}}
Runway\text{Runway}= Number of months surviving until cash equals zero

Laws & Principles

  • The 18-Month Rule: When raising a seed or Series A round, VCs typically want to see that the capital injected will give you at least 18 months of runway. It takes an average of 6 months just to close a fundraising round, meaning you must start pitching when you hit 12 months.
  • Default Alive vs Default Dead: Coined by Paul Graham, a startup is 'Default Alive' if its current growth rate will allow it to reach profitability before running out of cash. It is 'Default Dead' if it will hit zero before current growth reaches profitability, meaning a future fundraise is mandatory.

Step-by-Step Example Walkthrough

" A seed-stage SaaS startup has $1,000,000 in the bank. They spend $150,000/month on salaries and tools but generate $50,000/month in early subscription revenue. "

  1. Net Burn: $150,000 - $50,000 = $100,000 per month
  2. Runway: $1,000,000 / $100,000 = 10.0 Months
Final Result: Even though they have a million dollars, the company is in the 'Caution' zone with only 10 months of runway. They must either cut expenses, rapidly grow revenue, or start fundraising immediately.

Quick Answer: What is startup burn rate and how do I calculate runway?

Net Burn = Monthly Expenses − Monthly Revenue. Runway = Cash Balance ÷ Net Burn. Example: $1M in bank, $150K/month expenses, $50K/month revenue: Net Burn = $100K/month. Runway = $1,000,000 / $100,000 = 10 months (Caution zone). Investor standard: you need ≥18 months of runway after a fundraise because raising a new round takes 6–9 months. If your runway hits 12 months, start fundraising now. <6 months = danger: you are in a default-dead trajectory without immediate action.

Startup Burn Rate Benchmarks by Stage

Typical gross burn ranges for VC-backed startups by funding stage. Net burns vary significantly based on revenue traction. Source: Y Combinator benchmarks, Andreessen Horowitz portfolio data, SaaS Capital Survey (2023–2024).

Stage Typical Gross Burn Runway Target Key Milestone to Hit
Pre-seed / bootstrapped$5K–$25K/mo12–24 monthsFirst paying customer, product-market fit signal
Seed ($1M–$3M raised)$50K–$150K/mo18–24 months$50K–$250K ARR, repeatable sales motion
Series A ($5M–$15M raised)$200K–$600K/mo18–24 months$1M–$5M ARR, proven growth engine
Series B ($15M–$50M raised)$600K–$2M/mo18–24 months$5M–$20M ARR, path to profitability visible
Growth / pre-IPO$2M–$10M+/mo24+ monthsRule of 40 ≥ 40%, positive unit economics
Burn multiples above 2.0× (dollars burned per dollar of net new ARR) are considered concerning post-Series A. During the 2022–2023 funding contraction: investors shifted from growth-at-all-costs to “efficient growth” — many companies were required to show burn multiple <1.5× to raise new rounds. Gross burn only indicates scale; net burn and burn multiple are the investor metrics that matter.

Pro Tips & Critical Burn Rate Mistakes

Do This

  • ✓Start your fundraise when you have 12 months of runway remaining — not when you’re desperate at 3–4 months. The average time to close a VC round: seed = 3–5 months; Series A = 4–7 months; Series B = 4–6 months. Starting a fundraise with only 4 months of runway means you have already missed the window — VCs know you’re desperate, you have no negotiating leverage, and any delay in closing (which is common: legal issues, partner conflicts, LP approvals) collapses timelines completely. The correct trigger: runway hits 12 months = begin LP outreach and investor meetings. Runway at 18 months = consider re-engaging existing investors for a bridge to extend optionality. Companies that raise from strength (18+ month runway, strong metrics) consistently achieve higher valuations and better terms than those racing against a zero-cash deadline.
  • ✓Track burn multiple (dollars burned per dollar of net new ARR) alongside runway — it’s the metric investors scrutinize most in post-2022 fundraising environments. Burn multiple = net burn ÷ net new ARR added that month. A startup burning $200K/month while adding $100K new ARR has a burn multiple of 2.0×. Benchmark: <1.0× = excellent; 1.0–1.5× = good; 1.5–2.0× = acceptable early stage; >2.0× = increasingly difficult to fundraise post-Series A. Many companies with “sufficient” runway (18 months) still fail to raise because their burn multiple signals capital inefficiency: they are consuming 2× more cash per revenue dollar than the investor threshold. Calculate your burn multiple monthly and present it proactively — it demonstrates you understand your unit economics.

Avoid This

  • ✗Don’t use gross burn rate to calculate runway — you will underestimate how fast you’re running out of money if you ignore revenue. Gross burn = total expenses paid out. Net burn = gross burn − revenue. A company spending $200K/month with $80K/month revenue: gross burn runway (using $200K) = $1M / $200K = 5 months. Net burn runway (using $120K) = $1M / $120K = 8.3 months. You have 3.3 months more runway than the gross calculation suggests — significant for planning. But if you’re presenting to investors: always use net burn. VCs look specifically at net burn (they call it just “burn”) because it reflects the actual cash depletion rate accounting for current revenue. Using gross burn in an investor deck signals you don’t understand how burn is defined in the industry.
  • ✗Don’t assume runway is static — every hire, contract, or price change alters your burn trajectory and can collapse runway by months overnight. Runway calculated today assumes constant burn and constant revenue. In practice: a Series A company that hires 5 engineers in month 1 adds ~$75K–$100K/month in gross burn (salary + benefits + equipment + recruiting fee amortized). If that was not in the model: what looked like 18 months of runway is suddenly 12 months. Catalysts that commonly surprise founders: employer payroll tax resets in January; annual software contract renewals that spike monthly cost; customer churn spiking net burn by reducing revenue; one-time expenses (legal, office build-out) that inflate a single month. Re-calculate your runway every month using actual bank statement figures, not budget projections.

Frequently Asked Questions

What is the difference between gross burn rate and net burn rate?

Gross burn rate is total monthly cash expenditures: salaries, rent, cloud infrastructure, marketing, legal, G&A — every dollar leaving the bank account. It measures your total cost of operations with no offset for revenue. Net burn rate = gross burn − monthly revenue. It measures the actual rate your cash balance is declining. For a pre-revenue company: gross burn = net burn (they are identical). For a company with $100K of monthly revenue that spends $200K: gross burn = $200K, net burn = $100K. Runway is always calculated using net burn. VCs, board members, and sophisticated investors always frame burn in net terms. When someone asks “what’s your burn?” in a startup context, they mean net burn unless they explicitly say “gross.” Running out of cash faster than your net burn model predicted is almost always caused by either: unexpected revenue churn reducing the revenue offset, or unexpected gross burn above plan.

What is “Default Alive” vs “Default Dead” and how do I know which I am?

Coined by Paul Graham (YC): Default Alive means your company will reach profitability before running out of cash, assuming no new fundraising and current growth trends continue. Default Dead means it will hit zero cash before current revenue growth reaches breakeven — it has no self-sustaining path and must raise additional capital to survive. The test: project your monthly revenue growth rate forward and determine at what month net burn = $0. If that month is before your current runway expires: Default Alive. If it never happens before cash = 0: Default Dead. Example: $500K cash, $80K net burn, 10% MoM revenue growth, $20K current revenue. Breakeven = when revenue = gross burn. Revenue reaches ~80K in ~month 13 (20K × 1.10^13 ≈ 68K—close). Runway = $500K / $80K = 6.25 months. Revenue won’t reach $80K by month 6, so this company is Default Dead despite 10% growth. The Default Alive/Dead framework forces founders to confront fundraising necessity objectively, without wishful thinking about future raises that may not materialize.

How much runway should I have going into a fundraise?

Industry standard: start fundraising with 12+ months remaining. Here’s why: closing a VC round takes 3–7 months from first meeting to wire transfer. With 12 months of runway when you start: you have 5–9 months of cushion if the process takes longer than expected, one lead investor falls through, or diligence reveals issues that require a few months to remedy. Starting at 6 months of runway: every week of delay increases existential risk. At 4 months: you are in distressed fundraising mode — VCs know it, your negotiating position collapses, and they may offer predatory terms (high liquidation preferences, heavy governance controls, down rounds). At 2 months: most institutional VCs will not sign a term sheet because closing legally takes 60–90 days. Best practice: after closing a new round, immediately calculate the runway at the new cash level, set a calendar trigger at 12 months remaining, and if metrics are tracking well, consider starting conversations even earlier to maintain leverage.

What levers can I pull to extend runway without raising new capital?

Every dollar of change in net burn extends or compresses runway by (current runway / current net burn) months. For a $100K/month net burn with 10 months of runway: each $10K/month of burn reduction adds 1 month. Levers in order of typical impact: (1) Payroll reduction — largest single expense at most startups (60–80% of gross burn). Layoffs are immediate but devastating to morale and execution. Salary deferrals/reductions preserve team. (2) Vendor renegotiation — cloud infrastructure (AWS, GCP, Azure) is often 10–30% over-provisioned; right-sizing saves 5–15% of cloud spend instantly. SaaS tools can often be renegotiated for 20–30% lower pricing by paying annually or threatening churn. (3) Revenue acceleration — annual prepayment discounts (offer 10–20% off for annual vs. monthly) turn future ARR into immediate cash. (4) Accounts receivable speed — invoice net-30 customers net-15 with an early payment discount (2% net-10). (5) Revenue-based financing — for SaaS companies with $1M+ ARR, providers like Clearco or Lighter Capital offer non-dilutive capital at 6–12% effective rates, repaid as a percentage of monthly revenue.

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