Burn Rate: Startup Survival Arithmetic
Burn rate measures how quickly a company spends its cash reserves before becoming profitable. For startups, this metric literally determines survival. Understanding and managing burn rate is the difference between runway and crash landing.
Gross vs Net Burn Rate
- Gross Burn: Total monthly operating expenses. Useful for understanding cost structure.
- Net Burn: Monthly expenses minus revenue. Shows actual cash consumption.
- Runway: Cash balance / monthly net burn = months until out of money.
Burn Rate Benchmarks by Stage
Pre-seed startups should target 18-24 months runway minimum. Series A companies often burn -500K monthly. Series B and beyond may burn + monthly while scaling. The golden rule: start fundraising when you have 6+ months runway remaining, as raises typically take 3-6 months.
The worked example for burn rate was verified with the calculator form on this page—enter the same values to confirm the result.
Limitations: burn rate results are estimates for learning and quick checks—not financial, legal, tax, or medical advice. Policies, grading scales, and local rules may differ; confirm outcomes with official sources before making decisions.
When to use this calculator
- Use this page when the labeled Funds Spent to Date / Total Budget fields match your project or ops metric.
- Use efficiency for productive time vs available time.
- Use number is what percent for a plain part÷whole percent.
Still unsure about burn rate percent? Start with the quick answer above, then open the linked calculator that matches your wording.
Comparison: when to use each method
Use this table to pick the right percent workflow before you calculate.
| Scenario | When to use |
|---|---|
| Percent of a number | Finding a part of a whole (tax, tip, score) |
| Percent change | Comparing old vs new values |
❓ Frequently Asked Questions
What is burn rate and why does it matter?
Burn rate is the speed at which a company spends its cash reserves. Its crucial for understanding runway.
How do I calculate monthly burn rate?
Monthly Burn Rate = (Starting Cash - Ending Cash) / Number of Months.
What is runway and how do I calculate it?
Runway = Current Cash Balance / Monthly Burn Rate. This tells you how many months until you run out of money.
🔍 Authoritative References
For more information about professional and project management calculations, consult these trusted sources:
- Project Management Institute - Project management standards and best practices
- OSHA - Workplace safety standards and guidelines
- ISO Standards - International quality and process standards