Financial & Unit Economics

Burn Rate

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Burn Rate measures the rate at which a company is spending its cash reserves, typically expressed as a monthly net cash outflow. Gross burn is total monthly cash spending; net burn subtracts revenue received to show the net cash consumed. Burn rate divided into current cash balance gives runway: the number of months before the company runs out of money.

Managing burn rate is a primary survival metric for pre-profitability companies; unexpected acceleration in burn without corresponding revenue growth is a critical warning signal.

Formula

Cash at Start of Period – Cash at End of Period (monthly)

Where It Lives

QuickBooks / NetSuiteCash flow statement and monthly burn reporting
Brex / RampReal-time spend tracking by category and department
MosaicBurn rate forecasting and runway scenario modeling
StripeRevenue cash receipts offsetting gross burn for net burn

What Drives It

Headcount level and loaded compensation costs
Cloud infrastructure spend
Marketing and advertising expenditure
Revenue growth reducing net burn
One-time expenditures (legal, fundraising, large contracts)

Benchmark

Burn multiple (net burn ÷ net new ARR) below 1.5× is considered efficient; above 2× suggests the growth investment is generating insufficient return.

Common Questions About Burn Rate

What is the difference between gross burn and net burn?

Gross burn is total monthly cash outflows (all spending regardless of revenue). Net burn is gross burn minus revenue cash received. For example, if a company spends $500K per month and receives $300K in subscription payments, its gross burn is $500K and net burn is $200K. Net burn is the more relevant metric for runway calculation because it reflects the actual net cash depletion rate.

What is burn multiple and why is it useful?

Burn multiple (Net Burn ÷ Net New ARR) measures how much cash a company burns to generate each dollar of new ARR. A burn multiple of 1.0× means the company spends $1 of cash to add $1 of ARR. Below 1.0× is exceptional; 1.0×–1.5× is good; above 2.0× suggests the growth engine is inefficient. It is a useful complement to LTV:CAC because it accounts for the timing of cash flows.

How much runway should a startup maintain?

Most experienced VCs recommend maintaining at least 18–24 months of runway at all times, accounting for the time needed to raise a new round (typically 6–12 months). Starting a fundraising process with less than 12 months of runway creates significant pressure that disadvantages the company in negotiations. Companies should begin fundraising when they have 12–18 months remaining.

How can a company reduce burn rate without damaging growth?

Focus first on structural inefficiencies: infrastructure optimization, software consolidation, and operational overhead. Avoid cutting growth-generating expenses (high-performing sales reps, marketing programs with positive ROI). If headcount must be reduced, focus on roles that do not directly produce revenue or product improvements. Improving sales efficiency (higher win rates, shorter cycles) can maintain ARR growth while reducing the headcount needed to generate it.

Related Metrics

FCF | Free Cash Flow Operating Margin | Operating Margin EBITDA | EBITDA ARR | Annual Recurring Revenue

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