Startup Burn Rate Calculator
Find your net monthly burn rate and how many months of runway you have left.
How to use this startup burn rate calculator
- 1Enter your current total cash balance — include all bank accounts and liquid short-term investments your company can access.
- 2Enter your total monthly expenses — payroll is usually the largest item; include software, office, marketing, and all operating costs.
- 3Enter your current monthly revenue — for early-stage startups this may be zero; use MRR for subscription businesses.
- 4Net burn rate is what you are actually consuming per month after revenue; this is the number investors focus on.
- 5If your runway is under 12 months, treat it as an urgent signal to either begin fundraising immediately or cut expenses to extend runway.
- 6Use this calculator monthly to track whether your burn is trending in the right direction and whether your runway assumptions are holding.
How it's calculated
Net burn = monthly expenses − monthly revenue. Runway = cash ÷ net burn (months).
About the Startup Burn Rate Calculator
Burn rate and runway are two of the most critical numbers in a startup's financial reality, yet many founders are surprised to discover how little buffer they actually have when they calculate them carefully. The burn rate calculator forces clarity on a question that is easy to avoid in the optimistic day-to-day reality of building a company: exactly how long does the current cash supply last, and what needs to happen before it runs out?
Net burn rate — monthly expenses minus monthly revenue — is the actual cash consumption rate that determines your runway. In the earliest stages, with no revenue, net burn and gross burn are identical. As revenue grows, the gap between them shrinks, and this improving ratio is one of the most positive signals a startup can show investors. Tracking the trend in net burn monthly reveals whether the company is moving toward sustainability or whether expenses are outpacing revenue growth in a way that will require either faster fundraising or difficult cost decisions.
Runway — cash on hand divided by monthly net burn — is the single most important planning input for any startup's near-term strategy. The standard rule of thumb in venture-backed startups is to maintain at least 18 months of runway, with fundraising beginning when the timeline drops to 12 months. This schedule exists because fundraising takes time — typically 3–6 months from first investor meeting to cash in the bank for seed and Series A rounds — and because negotiating from a position of cash scarcity produces dramatically worse outcomes on valuation, dilution, and terms. Founders who start raising at 6 months of runway frequently discover that by the time a deal closes, they are making decisions under duress.
The relationship between burn rate and milestone achievement is what investors actually scrutinize, not the absolute burn number in isolation. A company burning $200,000/month while growing ARR from $1M to $3M in 12 months is making excellent use of its capital. The same burn with flat growth is burning investor money without producing the returns that justified the investment. This analysis — sometimes formalized as the "burn multiple" (net burn divided by net new ARR) — has become a standard efficiency metric in venture evaluation. Burn multiples below 1× indicate exceptional capital efficiency; above 3× is a warning sign.
Founders in the early stages of building often focus entirely on growth and product, treating financial management as something to think about later. This is understandable but risky. Maintaining a real-time view of cash position, burn rate, and runway is not just an investor-relations exercise — it is the information infrastructure that lets you make rational decisions about hiring, spending, and strategy. Many of the most painful startup failures have featured founders who were working hard and optimistic about the product right up until they discovered the company had weeks of cash left. Monthly financial reviews, even simple ones, are the single most effective way to avoid being surprised by a runway crisis.
Frequently asked questions
What is the difference between gross burn and net burn?
Gross burn is the total amount your company spends each month, regardless of revenue. Net burn is gross burn minus monthly revenue — the actual net cash consumed. A startup spending $100,000/month with $40,000 in monthly revenue has a $100,000 gross burn and a $60,000 net burn. Investors almost always discuss and evaluate net burn, because it shows the true cash consumption rate and how quickly revenue is reducing the company's dependence on external capital.
How much runway should a startup maintain?
18+ months of runway is considered healthy and gives founders time to build product, grow metrics, and raise the next round from a position of strength rather than desperation. 12 months is the signal to begin active fundraising — a Series A or Seed extension typically takes 3–6 months to close, so starting at 12 months gives you a small but viable cushion. Below 9 months, fundraising becomes urgent and founders often accept worse terms. Below 6 months, companies enter crisis mode where difficult decisions about layoffs and cost cuts become unavoidable.
How does fundraising timeline affect runway planning?
The biggest mistake founders make is waiting too long to start raising. A full fundraising process — from initial outreach to signed term sheet to closed wire — typically takes 3–6 months for seed and Series A rounds. Add another 30–60 days for legal diligence and closing documents. This means you should begin active fundraising when you have 12–15 months of runway, not 6. Founders who start raising at 6 months of runway often find themselves negotiating from a position of obvious distress, which significantly weakens their leverage on valuation and terms.
What are the fastest ways to extend runway without raising?
Revenue acceleration is the highest-leverage option — pushing annual contract prepayment discounts, closing deals faster, or launching a paid pilot program can add months of runway quickly. On the expense side, payroll is usually 50–70% of startup expenses, so leadership salary reductions and headcount optimization have the largest impact. Renegotiating vendor contracts, moving to annual SaaS subscriptions (often 20–30% cheaper), and eliminating non-critical tools are also effective. Some startups find they can cut burn by 25–40% with minimal impact on core business operations.
What burn rate do investors consider acceptable?
Investors evaluate burn rate relative to the progress it buys. A startup burning $150,000/month with strong growth metrics (tripling ARR, expanding LTV, improving retention) is spending efficiently. The same burn rate with flat metrics signals inefficiency. A useful rule of thumb is the burn multiple: net burn ÷ net new ARR added. A burn multiple below 1× means you are generating more new ARR than you are burning — highly efficient. Between 1–2× is reasonable for early growth. Above 3× suggests significant capital inefficiency that investors will question.
How should a startup present burn rate to investors?
Present burn rate with context: show the trend (is it going up or down?), break down the largest expense categories, and connect burn to measurable milestones. Investors want to understand what the money is buying. A narrative like 'We are burning $80k/month, 65% of which is engineering headcount building our core product, with launch in Q2 after which we project revenue to reduce net burn to $30k/month' tells a coherent story. Unexplained or inconsistently trending burn rates are a significant concern to investors who have seen companies where uncontrolled spending preceded failure.