Burn Rate Calculator Guide: How Long Will Your Startup Last? (2026)
Quick Answer
- *Burn rate is how much cash a startup spends per month. Gross burn = total monthly expenses. Net burn = monthly expenses minus revenue.
- *Runway = cash on hand ÷ net burn rate. A startup with $500K in the bank burning $50K/month net has 10 months of runway.
- *VCs recommend maintaining at least 18 months of runway at all times — enough buffer to fundraise without desperation.
- *People costs (salaries & benefits) represent 60–70% of total burn at most early-stage startups.
Gross Burn vs Net Burn: What's the Difference?
Every startup founder needs to understand two numbers: how much cash they spend, and how fast they are actually losing it. Those are not the same thing.
Gross burn rateis the total amount of cash your company spends each month — salaries, rent, cloud infrastructure, marketing, software subscriptions, legal fees, and everything else. It does not account for revenue.
Net burn rate is your actual cash depletion each month. It is gross burn minus revenue:
Net Burn = Gross Burn − Monthly Revenue
If you spend $80,000/month and generate $30,000 in revenue, your gross burn is $80,000 but your net burn is $50,000. That $50,000 is what actually leaves your bank account each month.
When Each Metric Matters
Investors and operators use these metrics for different purposes:
- Gross burn reveals your cost structure and overhead. A high gross burn means high fixed costs that are difficult to cut quickly in a downturn.
- Net burn determines your runway — how many months you have before you run out of money. This is the number that drives fundraising urgency.
Example: SaaS Startup at Seed Stage
Consider a 6-person SaaS startup with the following monthly costs:
| Expense | Monthly Cost |
|---|---|
| Salaries & benefits (6 people) | $55,000 |
| Cloud infrastructure (AWS/GCP) | $8,000 |
| Marketing & paid acquisition | $10,000 |
| Office / coworking | $3,000 |
| Software tools & SaaS | $4,000 |
| Gross Burn | $80,000 |
| Monthly Revenue (MRR) | $25,000 |
| Net Burn | $55,000 |
With $825,000 in the bank, this startup has exactly 15 months of runway (825,000 ÷ 55,000). That is uncomfortably short — most advisors would say start fundraising now.
How to Calculate Runway
Runway is the number of months your startup can operate before running out of cash. The formula is simple:
Runway (months) = Cash on Hand ÷ Monthly Net Burn Rate
If you have $500,000 in the bank and burn $50,000/month net, your runway is 10 months. A $1.2M raise at that burn rate buys you 24 months.
Why 18 Months Is the VC Benchmark
Y Combinator and most tier-1 VC firms consistently recommend maintaining at least 18 months of runway. The logic: a fundraising process typically takes 3 to 6 months from first outreach to money in the bank. If you start raising when you have only 6 months left, you are negotiating from desperation. Investors can smell it.
18 months gives you:
- 6 months to prepare, build relationships, and refine your pitch
- 4 months for the actual fundraising process (first meetings → term sheet → close)
- 8 months of cushion after close to execute without distraction
According to a First Round Capital analysis of their portfolio, founders who raised with 18+ months of runway consistently achieved better terms than those who raised out of necessity.
How to Extend Runway Without Cutting Your Team
- Push revenue harder. Every dollar of new MRR directly reduces net burn. A 20% revenue increase can add months of runway without cutting a single expense.
- Negotiate deferred compensation. Founders and early employees can agree to equity in lieu of cash for 6–12 months during crunch periods.
- Cut non-core marketing spend. Paid acquisition that is not converting should be paused first, not headcount.
- Move to annual billing. Convincing customers to pay annually instead of monthly improves cash position immediately.
- Apply for non-dilutive capital. SBIR grants, AWS Activate credits, and Stripe Atlas perks can reduce real cash burn without giving up equity.
Burn Rate Benchmarks by Funding Stage
How much should your startup be burning? It depends heavily on stage. Here are typical ranges based on Crunchbase and CB Insights startup data:
| Stage | Typical Net Burn / Month | Team Size | Recommended Runway |
|---|---|---|---|
| Pre-seed | $10,000 – $30,000 | 1–3 | 18+ months |
| Seed | $30,000 – $100,000 | 3–10 | 18+ months |
| Series A | $100,000 – $300,000 | 10–30 | 18–24 months |
| Series B | $300,000 – $1,000,000 | 30–100 | 18–24 months |
These are ranges, not targets. A capital-efficient Series A company might burn $80,000/month while a growth-at-all-costs competitor burns $500,000. Neither is inherently right — what matters is your burn multiple and the milestones your spend is buying.
CB Insights data on startup failure found that 38% of failed startups cited running out of cash as the primary or contributing cause. Burn rate management is not optional.
What Investors Actually Look At
Raw burn rate is a lagging indicator. Sophisticated investors care about efficiency metrics that contextualize your spend against the growth it produces.
Burn Multiple
Burn multiple, popularized by Andreessen Horowitz and David Sacks, answers a single question: how many dollars are you burning to generate one dollar of new ARR?
Burn Multiple = Net Burn ÷ Net New ARR
If you burn $200,000/month and add $100,000 in net new ARR in a given month, your burn multiple is 2.0. According to Andreessen Horowitz's benchmarks:
| Burn Multiple | Investor Interpretation |
|---|---|
| Below 1.0 | Outstanding — highly capital efficient |
| 1.0 – 1.5 | Good |
| 1.5 – 2.0 | Acceptable at early stages |
| 2.0 – 3.0 | Concerning |
| Above 3.0 | Problematic — often a fundraising blocker |
Rule of 40
The Rule of 40 is a SaaS health benchmark that combines growth rate and profitability: your revenue growth rate (%) plus your profit margin (%) should sum to at least 40. A company growing at 60% annually can run a –20% profit margin and still pass. A company growing at 20% needs a 20% margin to pass.
For early-stage startups, the Rule of 40 matters more at Series B+ when growth rates are starting to normalize. Pre-Series A, raw growth and unit economics matter more.
Capital Efficiency Ratio
First Round Capital tracks a simpler metric in early-stage deals: ARR at the end of the funding period divided by total capital raised. A startup that raised $2M seed and built $1M ARR has a 0.5× capital efficiency ratio — a reasonable benchmark for seed stage.
How to Reduce Burn Rate: The 5 Biggest Expenses
Most burn reduction advice is vague. Here is where startup cash actually goes — and how to cut each category without destroying the business.
1. People (60–70% of Burn)
Salaries, benefits, payroll taxes, and contractor fees typically account for the majority of any startup's burn. Every full-time hire adds $80,000 to $200,000+ per year in fully-loaded cost.
Strategies to reduce:
- Pause non-essential hiring for one quarter. This alone can reduce burn trajectory significantly.
- Convert senior full-time roles to fractional or advisory. A fractional CFO costs $5,000–$10,000/month vs $180,000+/year all-in for a full-time hire.
- Offer equity-heavy comp packages to early employees willing to defer cash.
2. Infrastructure & Cloud (5–20% of Burn)
Cloud costs tend to sprawl quickly. Common culprits: over-provisioned servers, unused compute resources running 24/7, redundant staging environments, and over-engineered architecture for current scale.
Strategies to reduce:
- Audit reserved instance usage — committing to 1–3 year terms typically saves 30–60% vs on-demand pricing.
- Implement autoscaling so dev/staging environments shut down outside business hours.
- Apply for AWS Activate, Google for Startups, or Azure for Startups credits — these can eliminate cloud bills entirely for 1–2 years.
3. Marketing & Paid Acquisition (5–20% of Burn)
Paid marketing is the most controllable expense line and should be the first to cut when CAC (customer acquisition cost) is not translating to LTV. A $50,000/month ad budget with a 6-month payback period is fine. The same budget with an 18-month payback drains cash before you prove the model.
Strategies to reduce:
- Cut all channels where CAC > LTV ÷ 3.
- Shift to organic growth levers (content, SEO, community, product-led growth) that compound without ongoing cash spend.
4. Office & Workspace (1–10% of Burn)
Physical office costs are largely optional for most early-stage startups. Post-2020, remote-first has proven viable across company types. A $5,000/month lease that could be replaced with $1,500/month of on-demand coworking adds 30+ months of runway over a 3-year period if net burn is $100,000/month.
5. Software & Tools (2–5% of Burn)
SaaS subscription bloat is real but usually a small percentage of total burn. Still, a systematic audit every 6 months — canceling unused seats, consolidating overlapping tools, and negotiating annual discounts — typically saves $1,000–$5,000/month at seed stage.
Calculate your runway and burn multiple
Use our free Burn Rate Calculator →Also check our SaaS MRR Calculator and Rule of 40 Calculator
Frequently Asked Questions
What is a good burn rate for a startup?
There is no universal “good” burn rate — it depends entirely on your stage and funding. A pre-seed startup should typically burn $10,000 to $30,000 per month. A seed-stage company commonly runs $30,000 to $100,000. What matters most is your runway: Y Combinator recommends maintaining at least 18 months of runway at all times. A startup burning $50,000/month with $900,000 in the bank has exactly 18 months of runway.
What is the difference between gross burn and net burn?
Gross burn is your total cash outflow each month — every dollar you spend on salaries, infrastructure, marketing, rent, and tools. Net burn is gross burn minus revenue. If you spend $80,000/month and bring in $30,000 in revenue, your gross burn is $80,000 but your net burn is $50,000. Net burn is what actually depletes your bank account. Investors care about both: gross burn reveals your cost structure; net burn determines your runway.
How do I calculate startup runway?
Runway is calculated as: Cash on Hand divided by Monthly Net Burn Rate. If you have $600,000 in the bank and burn $40,000 net per month, your runway is 15 months. Because fundraising typically takes 3 to 6 months, most investors and advisors recommend starting your next raise when you have 6 to 9 months of runway remaining — not when you are about to run out.
What is burn multiple and why do investors use it?
Burn multiple is the ratio of net burn to net new ARR: how many dollars you burn for each dollar of new annual recurring revenue. A burn multiple below 1.0 means you are generating more ARR than you are burning — extremely efficient. A burn multiple of 1.5 or below is considered good by Andreessen Horowitz. Above 2.0 raises questions, and above 3.0 is a red flag for most institutional investors. Burn multiple is a core efficiency metric in SaaS fundraising.
What is the biggest expense for most startups?
People. According to Y Combinator and First Round Capital data, salaries and benefits account for 60 to 70 percent of total startup burn at most early-stage companies. This is why the most impactful way to extend runway is almost always hiring more slowly, not cutting software subscriptions. The second largest expense varies by startup type — infrastructure and cloud costs dominate for tech companies, while marketing spend dominates for consumer businesses.
How much runway do I need before raising a Series A?
Most investors recommend having at least 18 months of runway when you begin a Series A process. The raise itself typically takes 3 to 6 months, so if your fundraising starts with 18 months of runway, you will still have 12+ months of cushion at close — enough time to execute without distraction. According to Crunchbase data, the median time between seed and Series A is 18 to 24 months for companies that successfully raise.