Burn Rate
The rate at which a company spends its cash reserves each month, critical for tracking how long funding will last.
Burn rate measures how quickly a company is spending its available cash, typically expressed as a monthly figure. It is one of the most closely watched metrics for startups and growth-stage companies that are not yet profitable and are operating on investor capital.
There are two versions: gross burn rate is total monthly cash outflows (all operating expenses paid in cash), while net burn rate subtracts any revenue collected to show the net cash consumed each month. Net burn rate is more meaningful because it reflects the actual pace of cash depletion.
For example, if a startup has $5 million in operating expenses per month and $2 million in revenue, its gross burn is $5M and net burn is $3M. With $18M in the bank, it has 6 months of runway at the net burn rate.
Burn rate is driven by headcount (typically 60–80% of cash expenses for tech companies), infrastructure costs, marketing spend, and rent. Rising burn in advance of revenue inflection points is expected — but unexpected acceleration without corresponding growth is a red flag.
VCs and board members monitor burn rate obsessively. The standard expectation is that a startup should have 18–24 months of runway after a financing round, providing time to hit milestones needed for the next raise. In adverse market conditions (as seen in 2022–2023), pressure to reduce burn and extend runway intensified significantly, driving widespread layoffs across the tech sector.
Burn rate calculations are part of financial modeling, board reporting, and investor updates. CFO platforms and FP&A tools like Mosaic, Runway, and Cube make burn rate dashboards a standard feature.
FAQs
What is a safe burn rate for a Series A startup?
There's no universal safe burn rate — it depends on revenue stage and growth trajectory. A common rule of thumb is spending no more than 1/18th of total cash reserves per month to maintain at least 18 months of runway. More important than the absolute number is the revenue-to-burn ratio improving over time.
How can a startup reduce its burn rate quickly?
The fastest levers are headcount reductions (typically 60–80% of expenses), followed by cutting discretionary marketing spend, renegotiating vendor contracts, delaying capex, and subletting office space. Revenue acceleration through pricing or new deals also reduces net burn.
Is zero burn rate a good goal?
Reaching break-even (zero net burn) is a significant milestone that eliminates financing risk and gives a company optionality. However, spending too little on growth can also be a mistake — the goal is efficient burn, not zero burn. Investors want to see capital being deployed to accelerate a proven growth model.
Related Terms
Runway
The number of months a company can operate at its current burn rate before exhausting its cash reserves.
Working Capital
The difference between current assets and current liabilities, measuring a company's short-term liquidity and operational efficiency.
Cash Flow Statement
A financial statement showing all cash inflows and outflows across operating, investing, and financing activities over a period.
Annual Recurring Revenue
The annualized value of all active recurring subscription contracts, the primary revenue metric for SaaS businesses.
