Most startups don’t fail because the idea is bad, they fail because the math stops working. Cash runway shrinks faster than growth compounds, CAC drifts up while retention slides down, and a few small misses stack into a big one. Before you scale, pressure-test your odds with data you control: runway, burn, growth, margins, and customer stickiness. The quick primer below sets the stage, then you can plug your numbers into the calculator.
Startup Survival Rate: What Are Your Odds?
Signals You’re Beating the Odds
- Founder–Market Fit is real: you have insider insight, distribution access, or a repeatable sales motion forming.
- Net Revenue Retention trends upward; expansions offset churn, and customers buy more by month 6–12.
- Unit Economics work at small scale: LTV/CAC > 3 with payback < 12 months and healthy gross margins.
- Burn Multiple (net burn / net new ARR) is improving as you grow, not worsening.
- Concentration Risk is falling: top 3 customers < 40% of revenue; pipeline diversity increasing.
- Cash Discipline: you know exactly how each incremental hire or campaign affects runway and growth.
Pro tip: Predictable growth with steady gross margin beats explosive growth with eroding margins. The calculator links these together so the story is coherent.
Reality Check: Risk Factors
- Runway vs. Ramp: sales cycles longer than cash runway create a silent cliff.
- Price Elasticity: discounts drive volume but compress margin and push out payback.
- Churn Drift: small monthly increases compound into major LTV damage within a year.
- Channel Dependence: CAC spikes when one channel saturates or policy changes.
- Hiring Ahead: premature scale raises burn multiple without durable efficiency gains.
What the Calculator Will Estimate
- Cash runway months based on burn and gross margin.
- Burn multiple trajectory given target growth.
- Payback period and LTV/CAC under different churn/CAC scenarios.
- A simple “survival likelihood” band using your inputs.
Open the Calculator
No sign-in. Bring your CAC, churn, and burn.
Startup Survival Calculator
Inputs
Use monthly figures where asked. The calculator updates as you type.
If “New customers / mo” is 0, the calculator will infer net new revenue from your growth rate.
Results
Runway
—
months
Payback
—
months
LTV / CAC
—
ratio
Burn multiple
—
net burn / net new ARR
Net new ARR
—
$/yr
Survival likelihood
—
How this is estimated
- Runway: cash ÷ monthly net burn. Net burn = OpEx − (MRR × gross margin).
- Payback: CAC ÷ (ARPA × gross margin).
- LTV: (ARPA × gross margin) ÷ churn; LTV/CAC is the ratio.
- Burn multiple: net burn ÷ (net new ARR ÷ 12).
- Net new ARR: 12 × (delta MRR). If “new customers / mo” provided, delta MRR uses it; otherwise uses growth − churn on MRR.
This is an educational estimate, not investment advice.
Quick stress test
+10% CAC
—
LTV/CAC
+2% churn
—
Runway (mo)
–2% growth
—
Burn multiple
Tip: aim for payback < 12 months, LTV/CAC ≥ 3, and a falling burn multiple as you scale.
