Burn Rate

What is burn rate?

Burn rate (also called monthly cash burn, cash consumption rate, or cash depletion rate) is the speed at which a company spends its cash reserves — measured on a monthly basis. It is the foundational metric for understanding how long a company can operate before needing additional funding. Burn rate is not a single number: it has two variants — gross burn and net burn — and confusing them is one of the most common errors in early-stage financial reporting.

Gross burn rate is the total cash leaving the business each month, before any revenue offsets. Net burn rate is what remains after subtracting the cash revenue actually collected in that month. For pre-revenue companies, gross burn and net burn are identical. For post-revenue companies, net burn is what actually determines runway.

Burn rate is distinct from operating expenses on an accrual P&L. A company can report $200K in monthly expenses while only burning $160K in cash — because some expenses are non-cash (depreciation, stock compensation) or involve timing differences (prepaid rent). Burn rate measures actual cash movement, not accounting entries.

For the ICP this page serves — pre-Series B SaaS founders and operators managing cash — burn rate is the metric that connects every hiring decision, marketing spend, and product investment to the single most important constraint: how many months of operation remain before the business needs new capital.

Why burn rate matters for operators

The cost of not tracking burn rate precisely is not an abstract risk — it is a specific, foreseeable outcome. Companies that monitor burn monthly can project the fundraise initiation date 6-9 months in advance. Companies that track burn quarterly discover the same cash crisis with 60-90 days to act instead of 6 months. The difference between those two scenarios is the difference between raising at favorable terms and raising in desperation — or not raising at all.

Burn rate is also the diagnostic metric that reveals cost structure problems early. A company growing MRR at $30K/month while net burn increases by $45K/month has a capital efficiency problem that will compound until corrected. The burn multiple (net burn divided by net new ARR) captures this ratio — but only if monthly net burn is accurately known.

Gross burn deserves attention separate from net burn. It shows the total cost base regardless of revenue performance. A company with $300K gross burn and $120K net burn looks fine on net — but if revenue drops 40%, net burn becomes $228K and runway compresses by months almost immediately. Understanding the gross burn floor is essential stress-testing.

Burn rate formula

Gross Burn Rate = Total Monthly Cash Outflows
  (Payroll + Rent + Software + Marketing + COGS + All OpEx)

Net Burn Rate = Gross Burn Rate - Monthly Cash Revenue
  (Cash collected in month, not ARR/12 or invoiced-not-received)

Alternate: Net Burn Rate = (Beginning Cash Balance - Ending Cash Balance) / Months

Example:
  Gross burn:      $220,000
  Cash collected:  $68,000
  Net burn:        $152,000

  If cash balance = $1,824,000
  Runway = $1,824,000 / $152,000 = 12.0 months

• Payroll — salaries, payroll taxes, benefits (typically 55-70% of gross burn at Series A)
• Rent and facilities — if not fully remote; use actual cash outflow, not lease-amortized amount
• Software and tools — SaaS subscriptions, AWS/GCP/Azure, data vendors
• Marketing and advertising — paid media, events, sponsorships
• COGS — hosting, support costs, data costs tied directly to revenue delivery
• Cash revenue — use actual bank deposits, not deferred revenue or unbilled amounts

Burn rate benchmarks by stage

Typical monthly burn ranges vary by funding stage and team size. These are ranges, not targets — the right burn rate is the one that produces sufficient growth per dollar consumed.

Sources: Bessemer Venture Partners State of the Cloud 2025; a16z SaaS benchmarks; industry-observed ranges from operator reports. Burn multiples benchmarks via David Sacks / Craft Ventures (2024).

Common mistakes when calculating burn rate

1. Confusing gross burn and net burn

Reporting net burn when asked for gross burn — or the reverse — gives investors and board members an incorrect picture of cost structure and runway simultaneously. Always label which burn number you are presenting. Pre-revenue companies: gross and net are the same. Post-revenue: the gap between them reveals how much revenue offsets operating costs.

2. Using ARR/12 as a proxy for monthly cash revenue

Annual contracts often involve upfront cash collection. Monthly contracts involve cash collection throughout the month, sometimes with lag. ARR/12 smooths all of this into a theoretical average. Actual cash collected in a given month may be 40-80% higher or lower than ARR/12 depending on billing cycles, new logo timing, and payment terms. Use bank statement cash receipts, not accounting estimates.

3. Not separating one-time expenses from recurring burn

A month with a $50K legal bill for a funding round, a $30K annual software invoice, or a $20K conference spend should not be treated as a new burn baseline. Separate one-time and recurring expenses each month. The recurring run-rate is what determines forward runway; the one-time items explain variance but shouldn't reset your baseline expectations.

4. Ignoring payroll timing differences

Payroll is typically the largest expense, and it doesn't always land in the same week each month. Semi-monthly payroll can produce months with one pay cycle vs. months with two, creating apparent $40-80K swings in gross burn that are entirely timing-driven. Normalize for payroll cycles when calculating monthly burn — or your MoM trends will be meaningless.

5. Not adjusting net burn for deferred revenue

Collecting an annual contract upfront inflates the cash balance and suppresses apparent net burn in the collection month — then makes net burn look higher in subsequent months when no new cash arrives. Track deferred revenue separately and calculate net burn on cash earned in the period (revenue recognized), or note the deferred revenue impact when presenting net burn numbers to avoid misinterpretation.

How Fairview tracks burn rate automatically

Fairview's Operating Dashboard connects to Stripe, QuickBooks, and Xero to pull actual cash inflows and outflows — not accounting estimates — and calculates both gross and net burn automatically each month. Payroll imports from integrated HR tools. The result is a burn calculation that uses cash basis data rather than accrual journal entries, which is the correct basis for runway projections.

When net burn increases month-over-month by more than 15%, or when the burn rate trajectory puts runway below 14 months, Fairview's Next-Best Action Engine surfaces a specific alert — not a generic warning. For example: "Net burn increased 34% MoM to $187K. Headcount costs +$28K from 2 new hires. Runway now 11.4 months at current rate. Fundraise timeline: consider initiating in next 60 days." The alert identifies the driver, quantifies the change, and recommends a specific action with a time horizon.

→ See how the Operating Dashboard works

Burn rate vs burn multiple

Burn rate measures absolute monthly cash consumption. Burn multiple measures capital efficiency — how much cash is spent per dollar of new ARR generated. A company can have a low burn rate but a terrible burn multiple (growing very slowly relative to spend), or a high burn rate with an excellent burn multiple (growing fast enough to justify the spend).

Frequently asked questions

Sources

1. Bessemer Venture Partners State of the Cloud 2025
2. a16z: How to Think About Burn Rate (Andreessen Horowitz)