Calculate startup runway, burn rate, and when you may want to raise or reach profitability.
Auto-updated · Verified daily against IRS, Fed & Treasury sources
Enter your numbers below
Based on your inputs
Reality Score:save 3 numbers across housing, debt & cash to see how your full picture holds up (0–100). One calc alone can't tell you that.
Stays in your browser. Never sent to us.
Analyze 3+ calcs to unlock your Financial Picture dashboard (cross-analysis of all your numbers).
Runway is the number of months your startup can operate with its current cash before running out of money. It's the clock counting down to your next milestone: profitability, customer traction, or the next funding round. Runway determines whether your startup is"default alive" (will reach profitability without raising) or"default dead" (needs funding to survive).
The formula is deceptively simple: Runway = Cash ÷ Monthly Net Burn. But calculating it correctly requires precision in your burn rate. Most founders get it wrong, either overestimating their runway by ignoring costs or underestimating it by not accounting for revenue growth.
Gross burn is your total monthly expenses: salaries, servers, marketing, office rent, everything. For a 5-person SaaS startup, gross burn might be $80,000/month.
Net burn is gross burn minus monthly revenue. If that same SaaS startup generates $20,000/month in customer revenue, net burn = $80k - $20k = $60k/month. This is the number that matters for runway.
Net burn is what determines your true runway. Many founders focus on gross burn and frighten themselves unnecessarily. If you're already generating revenue, your runway extends dramatically. A startup with $500k cash, $100k/month gross burn, and $60k/month revenue has:
Mistake 1: Ignoring revenue growth. Many early-stage startups grow revenue 5-20% monthly. If you're growing 10% month-on-month, your net burn shrinks each month—your runway actually extends. A static burn rate calculation underestimates your survival timeline. Use a dynamic calculator (like ours) to account for revenue growth.
Mistake 2: Forgetting fixed costs. Office rent, SaaS subscriptions, and insurance don't disappear if revenue drops. When projecting burn, ensure all fixed costs are included. Variable costs (payment processor fees, COGS for products) scale with revenue but should be budgeted conservatively.
Mistake 3: Forgetting one-time costs. When you raise a funding round, legal fees ($10-30k) spike. When you hire, recruitment and onboarding create lumpy costs. These should be amortized into your monthly burn or budgeted as separate reserve.
Mistake 4: Not separating unit economics from runway. A startup could have poor unit economics (losing $10 per customer) but still have 24 months of runway from large VC funding. Runway ≠ business model viability. Improving your burn rate matters more than your absolute runway if your business model is broken.
VCs and experienced founders aim for 18-24 months of runway because fundraising takes time. A typical Series A fundraising process is 3-6 months: pitching, due diligence, term sheets, closing. If you start fundraising at 12 months of runway and take 6 months to close, you'll still have 6 months of cash left when the new money arrives. If you start at <12 months, every month of fundraising delay creates panic.
The formula: Start fundraising when runway = fundraising time + 6-month buffer. For a 6-month fundraising cycle, start raising when you have 12 months of runway. For a 4-month cycle (possible with traction), start at 10 months. Never wait until you have <6 months of runway—your valuation will crater as investors sense desperation.
Step 1: Add up all monthly expenses.
Step 2: Add up all monthly revenue. Include only money actually collected, not commitments. Deduct payment processing fees and any COGS.
Step 3: Subtract revenue from expenses: that's your net monthly burn.
Step 4: Divide cash in bank by net burn. That's your runway in months.
Example: $300k cash, $60k/month expenses, $10k/month revenue = ($60k - $10k) = $50k net burn. $300k ÷ $50k = 6 months runway. This startup is in trouble and needs to raise or cut burn immediately.
1. Increase revenue (highest impact, hardest). Every dollar of customer revenue extends runway and improves your business model. If you can grow revenue 20% monthly while keeping burn flat, you're approaching break-even fast. Focus here first if you have any product-market fit signals.
2. Cut non-essential spending (medium impact, medium difficulty). Audit every subscription, contract, and vendor. Can you negotiate SaaS licenses? Renegotiate office rent or go remote? Reduce marketing spend temporarily? Non-essential includes conferences, retreats, and nice-to-have tools. Cut aggressively; you can reinvest later. A 20% cut to a $60k burn rate saves you 2 months of runway.
3. Delay non-critical hires (medium impact, easy). Hiring is the largest expense. If you have 6 months of runway, delay hiring for 3 months. This saves $15-30k/month depending on salary levels. Only viable if you can sustain current pace without new hires.
4. Founder salary reduction (low impact, high pain). Cut your own salary last, not first. It's painful and hurts morale. Founders often take $0 salary in crisis mode, but this only extends runway 1-2 months in most startups. Save this for true desperation.
5. Negotiate vendor deferment (low probability, worth asking). Call your biggest vendors (especially SaaS platforms you pay $10k+ to annually). Some will offer payment deferment or discounts if you ask. Rarely works but low cost to attempt.
A problem few face: what if you have $5M in VC funding and 48 months of runway? This creates complacency. Some startups with massive runway don't feel pressure to hit milestones, acquire customers, or profitability. They burn cash inefficiently. The best founders act as if they have 18 months even if they have 48. Pair your runway calculation with milestone targets:"In 6 months, we need $50k MRR. In 12 months, we need to be break-even or raise Series A." Runway enables the journey, but milestones drive it.
Input your current cash balance, monthly expenses, monthly revenue, and expected revenue growth rate. Our calculator shows:
Adjust the revenue growth rate to see how much traction you may want to reach break-even before cash runs out. This is your north star metric.
Never plan to your exact runway month. Build buffers:
Conservative planning saves startups. Optimistic planning kills them.
In a 2012 essay, Y Combinator founder Paul Graham divided startups into two categories: default alive and default dead. This simple framework changed how founders think about survival and strategy.
Default alive: A startup on a trajectory to reach profitability before its cash runs out. Revenue is growing, burn is controlled, and the business model works. If the founders execute well and don't make major mistakes, the startup survives without raising more money.
Default dead: A startup on a trajectory to run out of cash before reaching profitability. Revenue is flat or declining, burn is high, and the business model is unproven. Unless the startup raises funding, it will collapse. The founders' job is not building a business—it's fundraising.
This distinction is profound. It separates startups by fundamental viability, not by vanity metrics like growth rate or total users. A startup with 50% month-on-month growth but accelerating burn is default dead. A bootstrap with 5% monthly growth and shrinking burn is default alive.
To determine if you're default alive or dead, look at the trend:
Burn rate trajectory: Is your monthly net burn increasing, decreasing, or flat?
Revenue trajectory: Is your MRR (monthly recurring revenue) growing faster than burn is growing?
Runway: At current burn and growth rates, will revenue meet expenses before cash depletes?
Mathematical test: If (Revenue growth rate) > (Burn growth rate), you're default alive. If the opposite, default dead.
Example 1 (Default Alive):
Example 2 (Default Dead):
Use our calculator to run this scenario. Vary revenue growth and see how it affects break-even month. The shape of the curve—are you approaching break-even or moving away?—is your status.
A default-alive startup with 6 months of runway is in better shape than a default-dead startup with 24 months. Why? Default-alive startups don't need to raise. They can reach profitability through execution. Investors will fund them, but they don't have to accept bad terms because they have alternatives. Default-dead startups are fundraising-dependent. If the market turns or investors lose interest, that 24-month runway shrinks because they can't raise. The founders enter panic mode.
Historical example: Many startups built during the 2021-2022 boom were default dead—$100M in VC funding but monthly losses. When funding froze in 2023, they crashed. Meanwhile, bootstrapped startups with 1/10th the resources survived because they were default alive.
If you're default dead, your options are:
Option 1: Grow revenue faster. This is the permanent solution. If you can grow revenue 30% monthly while keeping burn flat, you'll cross break-even eventually. This requires product-market fit (PMF). If customers aren't buying, no amount of spend will fix it. Focus on PMF first, then scale spending to grow faster.
Option 2: Cut burn dramatically. Reduce expenses until your runway extends and revenue growth has time to catch up. This is painful (firing, cost-cutting) but sometimes necessary. A startup can cut burn 40-50% if it commits to survival over growth. Once approaching break-even, it can raise efficiently or bootstrap.
Option 3: Raise funding. If you have traction (growing revenue, active users) and a clear path to default-alive, investors will fund the gap. But never raise to stay default dead forever. Raise to bridge the gap while you hit PMF or scale. Eventually, you may want to become default alive or fail when funding dries up.
Option 4: Merge or sell. If you're default dead and growth is impossible, a strategic acquisition might be your exit. This is not failure; it's capital efficiency. Facebook acquired Instagram when Instagram was default dead but had 13M users and high engagement. PayPal acquired X.com when X.com was default dead but had promising technology.
Some startups receive massive VC funding ($50M+) and remain default dead. This is dangerous. With $50M and $5M monthly burn, the startup has 10 months of runway. But if revenue is stagnant, the clock ticks. Investors expect 24+ month runways after funding. If you're burning through it without hitting milestones, investors panic and the"death spiral" begins: bad press → harder fundraising → panic cuts → quality loss → slower growth → investor exodus.
Graham's advice: be default alive before raising, or raise aggressively to become default alive quickly. Don't stay in the middle.
Default alive is psychologically powerful. You don't wake up terrified about meeting payroll. You can take risks (hiring talented people, entering new markets) because you have breathing room. You hire for quality over speed. You can decline bad investors or customers. You sleep.
Default dead is psychologically crushing. Every month, the runway countdown ticks. Founders become paranoid about expenses. Hiring freezes occur. Everyone feels the pressure. Talented people leave because they sense death. This stress causes poor decisions.
If you're default dead, communicate honestly with your team. Don't hide the truth. Transparency builds trust and commitment. But also share your plan to become default alive—cost cuts, revenue acceleration, fundraising timeline. People rally around a clear path.
Monitor these monthly:
If break-even month is getting earlier each quarter, you're improving. If it's getting later, you're in trouble.
Default alive/dead applies to SaaS, B2B, and bootstrap models. It's less relevant for:
For these, think differently: fundraise for 5-7 year horizon, set milestone targets (not break-even targets), and measure progress by traction (users, partnerships, IP) not profitability.
The biggest fundraising mistake is timing. Raise too early, and you'll get bad terms because you have no traction. Raise too late, and desperation kills your negotiating power. The goldilocks zone is narrow: start fundraising when you have proof of concept and 12-18 months of runway remaining.
This seems contradictory."Start when I have 18 months?" many founders say."Won't I have more negotiating power with 24 months?" Technically yes, but fundraising has a long tail. If you start at 18 months and take 6 months to close, you finish with 12 months left—still comfortable. If you start at 12 months and take 6 months, you finish with 6 months—risky. If you start at 6 months, investors smell desperation and cap valuations, force unfavorable terms, and you might not close at all. The sweet spot is 18 months, which gives buffer.
Assume fundraising will take 6 months minimum. This includes:
Fast closes happen in 3-4 months (hot companies, insistent investors). Slow closes drag 9+ months (due diligence hell, multiple investors, multiple rounds). Budget for 6 months as baseline.
The most powerful lever in fundraising is traction. A startup with $100k MRR will raise at a 10-50× better valuation than a startup with $0 MRR and the same product. Why? Risk reduction. Investors are buying probability of success. Traction removes uncertainty.
Pre-traction startup:"$X million valuation because we're smart and the market is big." Investor skepticism. Valuation: $1-5M.
Traction startup:"$X million valuation because we have $100k MRR, 200 customers, 20% monthly growth, and a clear path to $10M ARR." Investor confidence. Valuation: $20-50M.
The moral: spend 6-12 months building traction before fundraising. This means:
With this, you'll raise in 3 months at a 2-3× better valuation. The extra 9 months of product work is worth millions in equity saved.
Signal 1: Consistent customer acquisition. You're acquiring 5-20 customers monthly without running out of growth levers. Sales process is somewhat repeatable.
Signal 2: Product-market fit indicators. Customers stay (>80% retention), refer others (word-of-mouth), and expand (increasing ARPU). These are the holy trinity of PMF.
Signal 3: Revenue acceleration. MRR is growing 10-30% monthly. This compounds to $1M+ ARR within 12-24 months if sustained.
Signal 4: Clear unit economics. You know what it costs to acquire a customer (CAC) and their lifetime value (LTV). LTV:CAC >3:1 is healthy.
Signal 5: Investor inbound. VCs start reaching out unprompted because they've heard about you. This is a massive advantage; you'll raise easier and faster.
You don't need all five. With three solid signals, you're fundable. With one, wait.
Mistake 1: Raising too early (pre-product or pre-traction). You'll get lower valuation (sometimes 50% lower) and restrictive terms. Founders give up massive equity for $500k that could've been raised at $5M valuation 12 months later. Build first, raise later.
Mistake 2: Raising too much (or too little). Raising $5M when you need $500k creates bloat and wastes runway. Raising $500k when you need $5M forces another fundraising cycle in 12 months when VCs have fatigue. Raise 18-24 months of runway based on reasonable burn growth.
Mistake 3: Taking the first offer. First term sheet is often 20-40% below fair market. Run a process with multiple investors. Getting 2-3 competing offers ensures you get market rate.
Mistake 4: Underestimating dilution. Many founders accept dilution without understanding compounding. Seed at 30% dilution, Series A at 25%, Series B at 20%, Series C at 20% = 52% remaining founder equity by C (rounded). Track this and set limits (many aim to preserve >20% post-Series B).
Mistake 5: Choosing the wrong investor. Highest valuation or biggest check isn't always best. Choose investors who (a) understand your market, (b) won't micromanage, (c) will help with recruiting and customers, (d) have a track record in your space. Bad investors with good terms destroy more value than good investors with bad terms.
Mistake 6: Staying stealthy too long. Some founders hide their traction to avoid competition. This backfires in fundraising. Investors want proof, not stories. Share your metrics (with NDAs if needed) to build trust and command higher valuations.
When you fundraise with <6 months of runway, you enter a desperation spiral:
This is how companies go from $10M equity (founder) after Seed to $1M equity after Series C, even with a successful exit. Avoid the spiral: plan runway, start raising at 18 months, execute traction in the interim.
Before approaching investors, prepare:
Pitch deck: 15-20 slides covering problem, solution, market, traction, team, ask. Spend 2-3 weeks polishing. Good design matters; sloppy decks signal sloppy execution.
Metrics dashboard: Live Google Sheet or Looker showing MRR, growth rate, churn, CAC, LTV, retention curves. Investors will ask"what's your churn?" If you don't know, you lose credibility.
Financial model: 3-year projection of revenue, expenses, and cash. Don't stress over perfection; investors know forecasts are guesses. But show you've thought through costs and growth.
Investor list: 50-100 VCs who invest at your stage in your vertical. Segment by tier: tier 1 (tier-1 brands, competitive), tier 2 (good investors, realistic), tier 3 (less competitive, fallback). Warm introductions are 10× more effective than cold emails.
Team bios: One-page summary of each founder's background, relevant experience, and why you're the right team to solve this problem.
Customer references: Offer 2-3 customers willing to speak to investors about your product and their results.
Raising isn't mandatory. If you can reach profitability (default alive) with revenue alone, consider bootstrapping. Benefits:
Many profitable startups (Basecamp, Mailchimp pre-acquisition, Automattic pre-IPO) bootstrapped for years. This works if you accept slower growth and don't need venture returns. If your market requires fast scaling to win (AI, deep tech, network effects), raising is necessary.
Runway (months) = Cash on Hand ÷ Net Burn Rate. Net burn = Monthly Expenses - Monthly Revenue. $500K cash at $50K/month net burn = 10 months runway.
Always aim for 18-24 months. This gives time to hit milestones and raise the next round without desperation. Below 12 months: raise immediately or cut burn.
Gross burn: total monthly spend. Net burn: spend minus revenue. Aim for net burn that gives 18+ months runway. VCs watch burn multiple: burn ÷ net new ARR.
Start raising when you have 12-18 months of runway left. Fundraising takes 3-9 months. Never raise when desperate — leverage disappears below 6 months runway.
Cut non-essential spend, delay non-critical hires, reduce founder salaries, negotiate vendor deferred payments, increase revenue (strong option), use revenue-based financing.
Monthly burn rate equals total monthly expenses including salaries, rent, software, marketing, and all operating costs. Net burn subtracts any revenue from total expenses. Track both gross and net burn to understand your full cash consumption.
Most advisors recommend 12-18 months of runway. Less than 6 months is critical and requires immediate action. Start fundraising when you have 9-12 months remaining since raising capital typically takes 3-6 months for most startups.
Cut non-essential expenses, renegotiate vendor contracts, reduce headcount to core team, pivot to revenue-generating activities, offer annual payment discounts to customers, and consider revenue-based financing or grants as equity alternatives.
Default alive means your current growth rate and expenses will lead to profitability before cash runs out. Default dead means you may run out of money first. Calculate by projecting revenue growth against burn rate to see which line crosses first.
Raise 18-24 months of runway per round. This gives 12-18 months to hit milestones and 3-6 months to raise the next round. Raising too little forces premature fundraising while raising too much dilutes ownership excessively.
Runway = Cash / Net monthly burn. Net burn = Monthly expenses - Monthly revenue. Break-even month = log(expenses/revenue) / log(1 + monthly growth rate). Default alive = break-even before cash runs out.
Every formula on this page traces to a federal agency, central bank, or peer-reviewed institution. We cite the rule-makers, not secondhand blogs.
Found an error in a formula or source? Report it →
Calculations are for educational purposes only. Consult a qualified financial advisor for personalized advice.