What is Startup Burn Rate?
Burn rate is the speed at which a startup spends its cash reserves before generating positive cash flow. Gross burn rate is total monthly expenses regardless of revenue, while net burn rate subtracts revenue from expenses. Combined with your cash balance, it determines your runway, the number of months before you run out of money.
The Formula
Gross Burn Rate = Total Monthly Expenses Net Burn Rate = Monthly Expenses − Monthly Revenue Runway = Cash in Bank ÷ Net Burn Rate
Always use net burn for runway calculations, as it reflects your actual cash consumption rate.
Worked Example
A seed-stage startup has $500,000 in the bank, $50,000/month in expenses, and $15,000/month in early revenue.
- Gross Burn Rate = $50,000/month
- Net Burn Rate = $50,000 − $15,000 = $35,000/month
- Runway = $500,000 ÷ $35,000 = 14.3 months
- Cash-out date ≈ 14 months from now
📌 The startup has ~14 months of runway. They should begin fundraising conversations at month 8 (6 months before cash-out), as raising typically takes 3-6 months.
Why This Matters
Fundraising timing
Start raising when you have 6-9 months of runway remaining. Wait too long and you'll negotiate from a position of desperation, leading to worse terms. Use our Runway Extension Calculator to model different scenarios.
Hiring decisions
Every new hire increases burn by $8,000-$15,000/month (fully loaded). Use the Employee Cost Calculator to understand the true cost before committing.
Pivot capacity
Your runway determines how many pivots you can afford. Track your revenue growth rate alongside burn to know if you're trending toward sustainability.
Common Mistakes
❌ Using gross burn instead of net
Gross burn ignores revenue entirely. If you're bringing in $20K/month on $50K in expenses, your actual burn is $30K, not $50K. Using gross burn creates unnecessary panic.
❌ Forgetting one-time costs
Annual payments (insurance, software licenses), quarterly tax obligations, and one-time costs (office setup, equipment) aren't captured in monthly burn but significantly impact cash.
❌ Assuming linear burn
Burn rate isn't constant. Hiring, marketing campaigns, and seasonal effects create spikes. Use a 3-month rolling average for more accurate runway estimates.
Industry Benchmarks
| Category | Good | Average | Poor |
|---|---|---|---|
| Pre-Seed Startups | $15-30K/mo | $30-50K/mo | $50K+/mo |
| Seed Stage | $30-50K/mo | $50-100K/mo | $100K+/mo |
| Series A | $80-150K/mo | $150-300K/mo | $300K+/mo |
Source: Kruze Consulting Startup Benchmarks
Benchmark data sourced from Kruze Consulting Startup Benchmarks.