How do I calculate my startup's gross vs net burn rate?
Understanding the distinction between total operating expenses and net cash outflow is essential for financial planning. I need a clear method to determine which metric applies to my specific SaaS business model.
✓ Accepted answer
Your startup's gross burn rate represents total monthly operating expenses, while net burn rate is the actual cash outflow after deducting any revenue.
- Calculate Gross Burn: Sum all cash operating expenses including salaries, office rent, SaaS tools, and marketing. This is the 'top-line' spending figure regardless of income.
- Determine Net Burn: Subtract your total monthly revenue from your gross burn. For example, if you spend $50,000 and earn $10,000, your net burn is $40,000. This metric reflects your true cash depletion speed.
- Apply to SaaS Models: For subscription businesses, track monthly recurring revenue (MRR) against monthly recurring expenses. If MRR exceeds operating costs, you have a negative burn rate, meaning you are cash-flow positive.
- Assess Runway: Divide your current cash reserves by your net burn rate to find your survival runway in months. Aim for at least 18 months of runway to negotiate effectively with investors.
- Use Financial Tools: Consistent tracking helps you monitor key metrics that drive fundraising discussions and operational budgeting.
If your net burn rate causes your cash runway to drop below three months, you must immediately restructure your spending or raise additional capital to avoid insolvency.
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