Burn Rate: Know Exactly How Long Your Runway Is
Published on March 13, 2026 · Jules, Founder of NoNoiseMetrics · 8min read
You have €24,000 in the bank. You’re spending €3,800 a month. You have 6.3 months. That’s burn rate. It’s not complicated. But most founders don’t track it until they’re 2 months out. This article explains the formula, the two types of burn rate, and how to calculate your exact runway right now.
Table of Contents
- What Is Burn Rate?
- Burn Rate Formula
- Gross Burn vs Net Burn
- What’s Included in Burn Rate?
- How to Calculate Your Runway Today
- How to Extend Your Runway
- Burn Rate Benchmarks
- Burn Rate by Funding Stage
- Real-World Scenario: When Burn Rate Tells You to Change Course
- FAQ
What Is Burn Rate?
Burn rate is the rate at which a company spends its cash reserves, typically measured per month.
Two types:
- Gross burn rate: total monthly cash outflows (all expenses)
- Net burn rate: total cash outflows minus revenue (the actual rate your cash is depleting)
For solo founders, net burn rate is what matters. It tells you how fast your savings are disappearing after accounting for revenue coming in.
Burn Rate Formula
Gross Burn Rate = Total Monthly Operating Expenses
Net Burn Rate = Total Monthly Expenses − Monthly RevenueFor a step-by-step walkthrough of the calculation with worked examples, see how to calculate burn rate.
And to calculate runway:
Runway (months) = Cash on Hand / Net Burn RateWorked example:
- Cash in bank: €18,000
- Monthly expenses: €2,400 (hosting, tools, subscriptions, living expenses)
- Monthly revenue: €800 MRR
- Net burn: €2,400 − €800 = €1,600/month
- Runway: €18,000 / €1,600 = 11.25 months
If net burn is zero or negative, you’re profitable — runway is theoretically infinite.
Gross Burn vs Net Burn — Which One to Track?
| Metric | Formula | When It Matters |
|---|---|---|
| Gross Burn | Total expenses/month | Planning expense reduction |
| Net Burn | Expenses − Revenue | Real runway calculation |
| Runway | Cash / Net Burn | How long you have |
- Net burn is what matters for survival planning
- Gross burn is what you cut when you need to extend runway
- Both are needed: gross burn shows you what’s fixable
The distinction matters during growth: your gross burn might increase (hiring a contractor) while net burn decreases (revenue growing faster). Track both.
What’s Included in Burn Rate?
Real expense categories for an indie hacker:
- Hosting + infrastructure (AWS, Railway, Vercel, Supabase)
- SaaS tools (Linear, Notion, email, analytics)
- Stripe fees (reduces effective revenue, so factor into net burn)
- Contractors/freelancers
- Advertising spend
- Living expenses (if building full-time with no income)
Common mistake: founders exclude living expenses from the calculation because “that’s personal, not business.” If you’re working full-time on your product with no salary, your living expenses are your implicit cost of labor. Ignoring them gives you a false sense of runway. You’ll feel comfortable at €800/month burn while actually depleting savings at €2,300/month. Include everything that comes out of the same pool of cash your company depends on.
What NOT to include:
- Equity dilution (not a cash outflow)
- Future hires (not yet a real expense — model them separately in your financial projections)
- Depreciation (non-cash accounting entry)
- One-time purchases already made (sunk costs — they don’t affect monthly burn going forward)
How to Calculate Your Exact Runway Today (Step by Step)
- Open your bank account — write down the current balance
- List all fixed monthly expenses — total them
- List variable monthly expenses — average over 3 months
- Open Stripe — take last month’s MRR (or average the last 3 months)
- Calculate net burn: expenses − MRR
- Calculate runway: bank balance / net burn
Takes 15 minutes. Do it now.
Two warnings about this calculation. First: don’t use your best month’s MRR — use the average of the last 3 months. Revenue fluctuates, especially early on, and over-estimating MRR gives you a dangerously optimistic runway number. Second: recalculate every month. Runway is a moving target. A founder who checks runway quarterly is flying blind for 90 days at a time.
Use the SaaS financial model that forecasts burn to build a monthly projection across different revenue scenarios.
How to Extend Your Runway Without Raising Money
Cut gross burn:
- Audit every SaaS subscription — most founders have €400–€800/mo in unused tools
- See the SaaS cost optimization audit for a systematic approach
- Downgrade infrastructure until MRR justifies the tier
Reduce net burn by growing MRR:
- Burn rate is a function of both sides: cut costs AND grow revenue
- Even €300/mo MRR growth reduces runway pressure meaningfully at early stage
Extend with annual plans:
- A 12-month upfront payment from one customer can add 2–3 months of runway
- Annual plans from 3 customers at €49/mo = €1,764 in immediate cash
Keep a budget vs actual weekly review to catch burn creep before it becomes a crisis.
Burn Rate Benchmarks
| Stage | Target Net Burn |
|---|---|
| Pre-revenue, solo | < €1,500/month |
| Post-launch, pre-€1K MRR | < €1,000/month |
| At €3K MRR | Near zero or positive |
| At €5K MRR | Cash flow positive |
Rule: if your net burn is more than 50% of your cash on hand, start cutting today. You have less runway than you think.
Burn Rate by Funding Stage
Your acceptable burn rate depends entirely on your funding situation. Here’s the reality:
Bootstrapped / Self-funded
Your runway is your savings account. Every euro of burn is a euro you can’t get back. Target: net burn under €1,500/month until you hit €3K MRR. The goal is survival long enough to reach profitability. There’s no Series A coming to reset the clock.
Friends & Family / Pre-seed (€50K–€200K raised)
You bought yourself 12–18 months. Gross burn should stay under €5,000/month. Spend on product and distribution, not on office space or tools you’ll use twice. The mistake most pre-seed founders make: they spend like they have 24 months when they have 14.
Seed (€500K–€2M raised)
Gross burn between €15K–€40K/month is common. The critical metric shifts from absolute burn to burn multiple: how much net new ARR are you generating per euro burned? A burn multiple above 2x (burning €2 for every €1 of net new ARR) is a warning sign. Below 1x means you’re scaling efficiently.
Post-seed / Series A
Burn rates of €50K–€150K/month are typical. At this stage, the conversation is about efficiency, not survival. Investors track burn multiple and months of runway remaining. The rule of thumb: always have 12+ months of runway after a raise.
Reference: Y Combinator’s startup survival data shows that the most common cause of startup death is running out of cash — not competition, not product failure.
Real-World Scenario: When Burn Rate Tells You to Change Course
Month 1: You launch with €30,000 in savings. Expenses: €2,200/month (€800 hosting/tools, €400 marketing, €1,000 living expenses). Revenue: €0. Net burn: €2,200. Runway: 13.6 months.
Month 4: MRR hits €600. Net burn drops to €1,600. Runway recalculated: €30,000 − (€2,200 × 4) + (€600 × 1 trailing average) = €21,200 remaining. At €1,600 net burn, that’s 13.25 months — barely changed because revenue is growing but hasn’t offset burn yet.
Month 7: MRR reaches €1,800. You added a €500/month contractor for design work. Gross burn: €2,700. Net burn: €900. Cash remaining: roughly €14,500. Runway: 16 months. The hire was worth it — runway actually increased because MRR grew faster than expenses.
Month 10: MRR hits €2,900. Gross burn: €2,700. Net burn: −€200 (cash-flow positive). Runway: infinite — you stopped burning. Time from launch to profitability: 10 months.
The scenario shows: burn rate isn’t just a number to minimize. It’s a ratio to manage. Cutting €300 in tools does less for runway than adding €500 in MRR. Track both sides.
For projecting these scenarios forward, use the scenario modeling stress test to run best/worst/base cases on your own numbers.
FAQ
What is burn rate in simple terms?
Burn rate is how fast you’re spending money. Net burn rate is how fast your savings are disappearing after accounting for any revenue you’re bringing in.
How do I calculate burn rate from Stripe?
Take your total monthly expenses and subtract your current Stripe MRR. That’s your net burn rate. Divide that into your bank balance to get runway in months.
What’s a good burn rate for a bootstrapped SaaS?
Aim for net burn under €1,000/month until you hit €2K–€3K MRR. After that, burn should be near zero. If you’re burning €2,000+/month pre-revenue, that’s 12 months of stress on a €24K savings pile.
Is burn rate the same as cash flow?
Not exactly. Cash flow is the full picture of cash in and out. Burn rate specifically refers to the net rate of cash depletion — how fast your reserves are shrinking. For the full breakdown of inflows minus outflows, see how to calculate net cash flow.
What is burn multiple and how does it relate to burn rate?
Burn multiple = net burn / net new ARR. It measures how efficiently you convert spending into revenue growth. A burn multiple below 1x is excellent (you’re adding more ARR than you’re burning). Between 1–2x is acceptable at early stage. Above 2x means you’re spending too much relative to growth. It’s the efficiency layer on top of raw burn rate.
Should I include my salary in burn rate?
If you’re paying yourself from the company: yes. If you’re living on savings and the company has no payroll: include your living expenses in the calculation anyway. They’re real cash outflows that determine your personal runway, even if the company’s bank account looks clean.
How do I reduce burn rate without killing growth?
Audit your SaaS stack first — most founders have €300–€800/month in unused or redundant tools. See the SaaS cost optimization guide for the systematic approach. Then look at infrastructure: are you over-provisioned? Next, push annual plans to existing customers — upfront cash extends runway without cutting anything. The last resort is cutting marketing spend, which reduces burn but also reduces growth.
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Sources: Y Combinator Startup School, First Round Capital “How to Calculate Burn Rate”, SaaS Capital Operating Metrics Study 2024