Net burn rate
DEFINITION
Net burn rate is the rate at which a company cash balance declines over a given period, after accounting for both cash going out and cash coming in, typically expressed as a dollar amount per month.
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Net burn rate is the rate at which a company's cash balance declines over a given period, after accounting for both cash going out and cash coming in. It is typically expressed as a dollar amount per month and is one of the primary metrics used to understand how much runway a company has left before it needs additional financing or reaches profitability. Net burn rate matters most for early and growth-stage subscription businesses that are not yet profitable, since it directly answers the question of how many months the company can continue operating at its current spending and revenue levels before running out of cash.
A subscription platform such as Recurly generates the recurring revenue and collections data that feeds directly into the cash-in side of this calculation, since accurate, timely visibility into collected revenue is a prerequisite for finance teams to calculate net burn correctly rather than estimating it from incomplete bank data.
Why net burn rate matters for subscription businesses
Net burn rate is one of the clearest signals of a company's financial runway, since it translates operating performance directly into how much time is left. For a venture-backed subscription business between funding rounds, or any company managing toward profitability, tracking net burn rate closely determines when the next fundraise needs to happen, or how aggressively spending needs to be cut to reach breakeven before cash runs out. Net burn rate also forces a company to look at cash generation and cash consumption together rather than separately. A business can have strong revenue growth and still burn cash quickly if spending is growing even faster, and net burn rate is the metric that captures that net effect in a single number finance and leadership teams can track over time.
How to use net burn rate
Finance and RevOps teams use net burn rate in a few concrete ways in planning and reporting.
Calculate runway (months of cash remaining) by dividing current cash balance by net burn rate, to understand how much time the company has before it needs new financing or to reach breakeven.
Track net burn rate trends month over month to see whether spending discipline and revenue growth are moving the company toward or away from profitability.
Use net burn rate in board reporting and fundraising materials, since investors typically want to see both the current burn rate and the trajectory of that number over recent quarters.
Model different growth and spending scenarios against net burn rate to stress-test how a hiring plan, a marketing spend increase, or a slower revenue ramp would affect runway.
How to calculate net burn rate
Net burn rate = Cash out minus Cash in (over a given period, typically one month) An equivalent way to express it: Net burn rate = Total operating expenses minus Total cash revenue collected (over the period) To calculate net burn rate for a given month:
Total all cash outflows for the period, including payroll, rent, software costs, and other operating expenses paid in cash.
Total all cash inflows for the period, primarily cash collected from customers.
Subtract total cash inflows from total cash outflows.
The result is the net burn rate for that period, expressed as a dollar amount (a positive number means the company is burning cash; a negative number means it is generating more cash than it spends). As an illustrative example: imagine a company spends $500,000 in cash during a given month on payroll, rent, software, and other operating costs, and collects $350,000 in cash from customers during that same month. The net burn rate for the month is $500,000 minus $350,000, which equals $150,000. If the company has $1,800,000 in the bank, dividing that cash balance by the $150,000 monthly net burn rate gives a runway of 12 months at the current pace.
Net burn rate vs gross burn rate
Net burn rate and gross burn rate both measure cash consumption, but they differ in whether incoming cash is factored in. Gross burn rate measures total cash operating expenses only, with no offset for revenue collected, so it reflects the full cost of running the business regardless of how much cash is coming in. Net burn rate subtracts cash collected from customers from that same expense figure, so it reflects the actual net decline in the company's cash balance. A company with strong revenue growth can have a high gross burn rate (it is spending a lot to grow) while still having a manageable net burn rate (a large share of that spend is being offset by cash coming in). Tracking both together shows whether a company is burning cash because it spends heavily, because it collects too little, or both.
Benefits and examples
Tracking net burn rate closely delivers direct planning value:
Runway visibility. Net burn rate is the key input for calculating how many months of operation remain at the current cash balance.
Fundraising timing. A clear, trending view of net burn rate helps leadership decide when to start a fundraising process well ahead of running low on cash.
Spending discipline. Monitoring net burn rate month over month surfaces whether cost growth is outpacing revenue growth before it becomes a crisis.
Scenario planning. Modeling net burn rate under different assumptions (a hiring freeze, a pricing change, a slower sales ramp) helps leadership make informed tradeoffs.
Frequently asked questions
Is net burn rate the same as monthly operating loss? They are closely related but not identical. Operating loss is typically based on accrual accounting (revenue recognized and expenses incurred), while net burn rate is based on actual cash movements, so timing differences like unpaid invoices or prepaid expenses can cause the two figures to diverge in a given month.
What is considered a healthy net burn rate? There is no single healthy number; it depends on the company's cash balance, growth stage, and access to future financing.
How does net burn rate relate to runway? Runway is calculated by dividing the current cash balance by the net burn rate, giving the number of months the company can continue operating at its current pace before running out of cash, assuming no change in spending or collections.
Can net burn rate be negative? Yes, a negative net burn rate means the company collected more cash than it spent during the period, which means its cash balance grew rather than declined, sometimes called being cash flow positive for that period.
