Startup Runway Calculator

FAQ

What is startup runway?

Runway is the number of months a startup can operate before running out of cash, assuming current income and expenses stay constant. If you have $100,000 and burn $20,000/month net, your runway is 5 months. Startups typically aim for 12–18 months of runway to give enough time to hit milestones and close a new funding round.

What is burn rate?

Burn rate is how fast a company spends money. Gross burn is total monthly expenses. Net burn is expenses minus revenue. A company with $50,000 in expenses and $20,000 in revenue has a gross burn of $50,000 and net burn of $30,000. Net burn is the number that drives your runway calculation.

How much runway should a startup have?

Most investors and advisors recommend 12–18 months of runway. Less than 6 months is critical and requires immediate fundraising or drastic cost cuts. 18–24 months is comfortable and gives time to reach meaningful milestones. Having more than 24 months can sometimes signal over-capitalization, but it is rarely a problem in practice.

How can I extend my startup's runway?

There are two main levers: reduce burn rate or increase revenue. On the cost side, review your largest expense categories — usually salaries, rent, and marketing — and cut non-essential spending. On the revenue side, accelerate sales, raise prices, or pursue faster-paying customers. Even small improvements compound significantly: cutting $5,000/month from a $50,000 burn rate extends a $500,000 runway from 10 months to ~11.1 months — gaining over a month without any new funding.

When should a startup start fundraising?

Begin fundraising when you have at least 6 months of runway remaining — ideally 9–12 months, because fundraising typically takes 3–6 months from first outreach to cash in the bank. Starting too late puts you in a weak negotiating position and creates existential risk. The best time to raise is when you don't desperately need to: strong metrics, growing revenue, and sufficient runway give you the leverage to negotiate favorable terms.

What is "default alive" vs "default dead"?

"Default alive" (coined by Paul Graham) means that at current growth and burn rates, your startup will reach profitability before running out of money — without any additional funding. "Default dead" means the opposite: you will run out of cash before becoming self-sustaining. Knowing which category you're in is essential for every strategic decision. Use this calculator's "Months to Profitability" output to determine your status. If you're default dead, you must either cut burn, grow revenue faster, or raise capital.

What are typical runway benchmarks by funding stage?

Benchmarks vary by stage: Pre-seed startups typically operate with 6–12 months of runway (often bootstrapped or angel-funded). Seed-stage companies should target 18–24 months to give enough time to demonstrate product-market fit. Series A companies typically raise 18–24 months of runway to scale a proven model. Series B+ companies often raise 12–18 months because they can raise again more quickly. Regardless of stage, always aim to close your next round while you still have at least 6 months of runway remaining.

How does hiring affect startup runway?

Hiring is typically the single largest impact on startup runway. A new engineer in the US costs $120,000–$180,000/year in total compensation, which translates to $10,000–$15,000/month in additional burn. Adding 3 engineers to a $100,000/month burn rate increases it by 30–45% and can cut a 12-month runway to 8–9 months. Before hiring, ask: will this person generate or enable revenue growth that more than offsets their cost within 6 months? If not, delay the hire until runway is secure.

How does remote work affect startup runway?

Switching to fully remote can dramatically extend runway. Office rent for a 20-person startup in a major city typically costs $15,000–$30,000/month. Eliminating that expense alone can add 2–4 months of runway on a typical seed-stage budget. Beyond rent, remote teams often have lower recruiting costs (access to global talent at lower price points) and reduced overhead. The trade-off is coordination costs and culture-building complexity, which must be weighed against the runway benefit.

What is bridge financing and when should a startup use it?

Bridge financing is a short-term loan or investment — usually from existing investors — designed to extend runway until a larger funding round closes or a key milestone is reached. Use bridge financing when: (1) you are close to closing a larger round but need 2–4 more months of runway, (2) you have a near-term revenue event (e.g., a large contract closing) that will dramatically change your metrics, or (3) market conditions are temporarily unfavorable for raising. Bridge financing typically comes as a convertible note or SAFE and dilutes founders less than a down round. Avoid bridging just to delay hard decisions — it only makes sense when the underlying business trajectory is improving.

When should a startup consider pivoting based on runway?

A runway-driven pivot makes sense when you have 6–9 months remaining, growth is flat or declining, and the current product direction shows no clear path to revenue. With less than 6 months of runway, radical changes are very risky because they require execution time you don't have. With more than 12 months, you have space to iterate without a hard pivot. The decision framework: if you cannot clearly articulate what milestone you will hit in the next 3–4 months that will meaningfully change your fundraising prospects, consider a strategic pivot before your runway becomes critical.

How does monthly revenue growth rate affect my runway?

Revenue growth rate has a compounding effect on runway. At 10% monthly growth, revenue doubles roughly every 7 months. A startup burning $50,000/month with $10,000 in monthly revenue will reach profitability in about 17 months — even though at a static burn/revenue the simple runway would be just 9 months. The key insight: even modest, consistent growth dramatically changes your financial destiny. This is why investors focus so heavily on growth rate as a signal of eventual capital efficiency.

How do I optimize burn rate without laying off my team?

Several levers exist before resorting to layoffs: (1) Renegotiate software subscriptions — startups often overpay for tools they underuse; auditing SaaS spend typically saves 10–20% of the software budget. (2) Reduce cloud infrastructure costs by right-sizing instances or negotiating startup credits with AWS, Google Cloud, or Azure. (3) Cut paid acquisition if CAC exceeds a sustainable multiple of LTV. (4) Defer founder salaries in exchange for equity true-ups. (5) Switch to remote or hybrid to reduce office costs. (6) Renegotiate vendor contracts — most vendors prefer a lower rate to losing a customer entirely.

What is the difference between gross burn and net burn?

Gross burn is your total monthly spending regardless of revenue — it represents the maximum cash you could burn in a month if all revenue disappeared. Net burn is gross burn minus revenue, and it's the number that actually depletes your cash balance. Example: $80,000 gross burn with $30,000 revenue = $50,000 net burn. Always communicate net burn to investors, as it reflects your actual cash consumption. Track both: a rising gross burn with a stable or declining net burn indicates healthy revenue growth covering new spending.

How much should I raise in my next funding round?

The standard formula: raise enough to cover 18–24 months of runway plus a buffer for unexpected expenses. Calculate it as: (Monthly net burn × 20 months) + current cash shortfall. For example, if your net burn is $80,000/month and you want 20 months of runway: raise $1.6M. Add 10–20% as a buffer for slower-than-expected growth. Avoid raising more than 24 months of runway at once — it signals poor capital efficiency and increases dilution unnecessarily. The goal is to raise enough to hit the milestones that justify your next round at a significantly higher valuation.