definition

The burn rate is the speed at which a company spends its available cash before generating positive cash flow from operations.

Put simply, it measures how quickly a business is “burning” through its funds each month to cover expenses such as salaries, rent, product development, and marketing.

Burn rate is usually expressed as a monthly figure, for example, “the startup has a burn rate of $200,000 per month.”

The concept gained widespread adoption in the startup ecosystem during the dot-com boom of the late 1990s, when many young tech companies raised substantial sums of venture capital but struggled to convert that capital into sustainable revenue.

Founders and investors closely monitor burn rate because it directly determines a company’s financial runway. Runway defines the amount of time it has before needing to raise more capital or reach profitability.

Many startups fail because they mismanage their burn rate, scaling too quickly or overspending on customer acquisition without a clear path to revenue.

A high burn rate can drain cash reserves faster than expected, leaving little room to pivot or weather market downturns.

Companies that manage their burn rate carefully can extend their runway, giving them more time to refine products and achieve market fit.

For example, Airbnb famously tightened its burn rate during the 2008–2009 financial crisis, cutting costs and focusing on core growth, which later helped it scale sustainably.

Understanding burn rate serves as a reality check on spending discipline, signals financial health, and often determines whether a startup will survive long enough to become a profitable and enduring business.