Gross Burn vs Net Burn: Which One to Use for Runway
$200K/month burn. But which: gross or net?
The difference can be $80K — and change runway from 6 months to 4.
💡 Shortcut: want to calculate burn rate and runway automatically? Open the KPI Dashboard.
The difference in one line
Gross Burn = all monthly expenses (ignores revenue)
Net Burn = expenses - revenue (cash that actually leaves)
Numerical example
SaaS company in a month:
- Total expenses: $200,000
- Revenue (MRR): $80,000
Gross Burn: $200,000
Net Burn: $200,000 - $80,000 = $120,000
If the company has $1,000,000 in cash:
- Runway with gross burn: $1M / $200K = 5 months
- Runway with net burn: $1M / $120K = 8.3 months
3.3 months difference. Enough to make a wrong decision.
When to use each
Gross Burn is for:
- Understanding total operation cost
- Evaluating whether overhead is too high
- Comparing with prior period (cost control)
- Pre-revenue: it's the only one available
Net Burn is for:
- Calculating real runway
- Deciding fundraising timeline
- Assessing efficiency (Burn Multiple)
- Reporting to investors
The most common trap
Company looks at decreasing net burn and relaxes: "it's improving, runway is extending".
But net burn can drop for two reasons:
- 1Revenue rose (good — product gaining traction)
- 2Expenses rose less than revenue (also good)
But it can also drop because:
- 1Late payment came in this month (not sustainable)
- 2Annual expense paid in January didn't repeat (returns in 12 months)
Looking at only net burn without decomposing where the improvement came from is a recipe for surprise in 3 months.
The practical rule
Financial cockpit has both:
- Gross Burn (spend control)
- Net Burn (runway calculation)
- Net New MRR (new net revenue)
- Burn Multiple = Net Burn / Net New MRR (efficiency)
Burn Multiple below 1 = efficient. Above 2 = expensive. Above 4 = alert.
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Keep reading
Keep reading about KPIs
MRR vs ARR: The Real Difference and When to Use Each
MRR and ARR aren't the same metric viewed from different angles. They serve different functions — and using the wrong one distorts decisions.
SaaS Metrics Guide: The 8 Numbers That Actually Matter
MRR, churn, CAC, LTV, runway, burn rate. The 8 numbers that separate SaaS that survives from SaaS that dies — no fancy formulas, real numerical examples.
Burn Rate Calculator: Find Yours in 5 Minutes
The number running while you're not looking. Gross vs net burn, the 7 items nobody adds, and why growth makes burn rise faster than revenue.
Frequently asked questions
What's the difference between gross burn and net burn?
Gross burn is the sum of all monthly expenses. Net burn is expenses minus revenue. A company with positive revenue has net burn lower than gross. A pre-revenue company has both equal.
Which to use for runway?
Net burn. Runway = Cash / Net Burn. Using gross burn underestimates runway because it ignores incoming revenue. Using net burn without adjusting for growth underestimates when you're hiring.
What if revenue varies a lot month to month?
Use 3-month rolling average to smooth. Don't use the best month (dangerous optimism) or the worst (paralyzing pessimism). Rolling average captures the trend without distorting from a one-off event.
Are burn line and burn rate the same?
No. Burn rate is the speed of burning ($/month). Burn line is the cumulative cash curve over time. Burn rate is the speed, burn line is the state. The two together tell the full story.