Gross Burn

What is gross burn?

Gross burn (also called gross burn rate, total cash outflows, or operating cash spend) is the sum of all cash leaving a company in a given month — before subtracting any revenue collected. It is the top-line view of a company's cost base expressed as a monthly cash number. Unlike a P&L operating expense line, gross burn excludes non-cash charges (depreciation, amortization, stock-based compensation) and captures actual cash movement.

Gross burn is one half of the burn rate equation. The other half is net burn, which subtracts cash revenue from gross burn to show actual cash depletion. For pre-revenue startups, gross burn and net burn are identical. For post-revenue companies with $200K gross burn and $80K in monthly cash revenue, net burn is $120K — but gross burn remains $200K regardless of how revenue performs.

Gross burn matters independently because it represents the floor of cash risk. If revenue disappears tomorrow — a large customer churns, a channel stops performing, an enterprise deal pushes — net burn instantly rises to equal gross burn. A company operating at $80K net burn with $220K gross burn has hidden risk: one bad revenue month turns a manageable net burn into a severe one. Gross burn shows what the company costs to run, separate from what it earns.

For the ICP this page serves — pre-revenue and early-revenue SaaS founders, Series A operators, and CFOs assessing cost base — gross burn is the metric that shows what the business costs to operate at its current headcount and infrastructure. It is the starting point for scenario planning: if we hire 3 engineers, gross burn goes up by $X. If we pause paid media, gross burn drops by $Y.

Why gross burn matters for operators

The cost of not tracking gross burn separately from net burn is a systematic underestimation of cost-base risk. A company that only monitors net burn treats revenue as a permanent offset — and is blindsided when a churn event, billing failure, or revenue delay suddenly inflates net burn by 50% or more in a single month. Gross burn is the stable number that doesn't fluctuate with revenue timing. It is the controllable cost base that management can actually act on.

Gross burn is also the metric that determines how fast cash reserves deplete in a zero-revenue scenario — a useful stress test for any company raising its next round. If the fundraise takes 6 months longer than planned and revenue stalls, gross burn determines the absolute runway floor. A $1.5M cash balance with $300K gross burn means 5 months of total runway in the worst case, regardless of current net burn calculations.

For Series A companies evaluating cost base efficiency, gross burn broken into categories — payroll, infrastructure, marketing, other — reveals which expense buckets are growing faster than revenue. A company where gross burn grew 40% MoM while ARR grew 12% has a structural cost problem that will not self-correct. Gross burn tracking makes this visible before it becomes a board-level crisis.

Gross burn formula

Gross Burn = Σ (Payroll + Rent + Software + Marketing + COGS + All Other OpEx) per month

All inputs must be cash basis — not accrual.

Example breakdown for a 15-person Series A company:
  Payroll + benefits:    $165,000
  Cloud infrastructure:  $18,000
  SaaS tools:            $12,000
  Paid marketing:        $25,000
  Rent + facilities:     $8,000
  Legal + finance:       $6,000
  Other OpEx:            $11,000
  ─────────────────────────────
  Gross Burn:            $245,000/month

Note: Exclude non-cash items:
  - Depreciation
  - Amortization
  - Stock-based compensation (SBC)
  - Unrealized FX gains/losses

• Payroll — gross salaries, employer payroll taxes, health insurance, 401k match (typically 60-70% of gross burn)
• Rent and facilities — actual monthly cash outflow; exclude lease accounting adjustments
• Cloud infrastructure — AWS, GCP, Azure; include all compute, storage, data transfer
• SaaS tools — subscriptions for product, engineering, sales, marketing tools
• Paid media — Google Ads, LinkedIn, Meta; cash out in the month, not commitment-based
• COGS-related cash — support contractor costs, third-party data costs, direct delivery costs
• Legal, accounting, finance — monthly retainers or allocated annual spend

Gross burn benchmarks by team size and stage

Gross burn scales primarily with headcount, since payroll accounts for 55-70% of all cash outflows at most SaaS companies.

Sources: Bessemer Venture Partners State of the Cloud 2025; Kruze Consulting SaaS Benchmark Report 2025; industry-observed ranges from operator reports. Payroll percentages vary by whether company uses contractors vs. FTEs and geographic distribution of team.

Common mistakes when calculating gross burn

1. Including one-time capital expenditures as recurring burn

A $60K server purchase, a $40K legal fee for a funding round, or a $25K annual conference sponsorship are not part of the recurring cost base. Including them in a monthly gross burn figure inflates the apparent burn rate and distorts runway calculations. Separate one-time capex and extraordinary items from recurring operational spend. Report both, but treat them differently in runway projections.

2. Netting out revenue to arrive at a single burn figure

Subtracting revenue from cash outflows produces net burn, not gross burn. Both are valid and necessary metrics — but they answer different questions. Gross burn shows cost structure. Net burn shows cash depletion. Reporting only a combined "burn after revenue" number hides the gross burn baseline and makes it impossible to stress-test against a revenue shortfall scenario.

3. Forgetting to amortize quarterly and annual expenses into monthly burn

Annual software contracts, quarterly insurance premiums, and semi-annual audit fees create lumpy cash outflows that distort gross burn in the month they're paid. Divide these into monthly equivalents for run-rate burn calculations. A $36K annual data contract should add $3K/month to gross burn — not $36K in January and $0 for the next 11 months.

4. Excluding non-cash expenses from the cash picture — or accidentally including them

Gross burn is a cash metric. Depreciation, amortization, and stock-based compensation are real economic costs but they are not cash outflows. Do not include them in gross burn. Conversely, do not exclude actual cash expenses because they are classified as non-operating on the P&L — cash interest payments, for example, are real burn even if they sit below the operating income line.

5. Not distinguishing controllable from committed burn

Not all gross burn is equally actionable. Payroll for existing employees and annual lease obligations are committed — you cannot turn them off in 30 days. Paid media, contractor spend, and discretionary SaaS tools are controllable — you can cut them immediately. Breaking gross burn into committed vs. controllable shows how quickly you could reduce spend if needed, which is a critical input for any fundraise delay scenario.

How Fairview tracks gross burn automatically

Fairview's Operating Dashboard connects to QuickBooks, Xero, and Stripe to pull actual cash outflows by category — payroll, infrastructure, marketing, COGS — and calculates gross burn on a cash basis each month. Quarterly and annual expenses are amortized automatically so that the monthly gross burn figure reflects a true run rate, not lumpy payment timing.

When gross burn increases more than 20% month-over-month without a corresponding increase in pipeline or ARR, Fairview's Next-Best Action Engine surfaces a specific cost-driver alert: "Gross burn increased from $182K to $241K over 60 days (+33%). Marketing spend up $38K; contractor costs up $21K. No corresponding increase in pipeline generated." The alert names the category, quantifies the delta, and flags the missing revenue signal — so operators can investigate and act on the right variable.

→ See how the Operating Dashboard works

Gross burn vs net burn

Gross burn and net burn measure the same company from different angles. Gross burn shows the full cost base. Net burn shows actual cash depletion. Both are necessary — neither alone is sufficient for managing a startup's financial position.

Frequently asked questions

Sources

1. Bessemer Venture Partners State of the Cloud 2025
2. Kruze Consulting SaaS Startup Benchmarks 2025