What is Burn Rate?

Why It Matters

Burn rate matters because it converts a company's entire financial situation into one number that answers the most urgent question a founder or investor can ask: how much time is left. Ignoring it means a company can keep spending at an unsustainable pace without anyone noticing until the bank balance is dangerously low and fundraising options have narrowed. It matters because burn rate combined with cash on hand produces runway, the number that determines whether a team has months or years to prove out a strategy before needing to raise again or reach profitability. Investors watch it closely because a rising burn rate without a corresponding rise in revenue or growth signals inefficient spending, while a controlled burn rate against strong growth is usually seen as healthy, aggressive investment. Because burn rate is entirely within a company's control through hiring and spending decisions, it's one of the few growth-stage metrics a team can adjust quickly if runway starts looking short.

Example

A startup has $1,200,000 in the bank at the start of January and $1,050,000 at the start of February, spending $150,000 net that month. Its monthly burn rate is $150,000. If spending holds steady at that rate while the company has $900,000 left in the bank, it has 6 months of runway before the account reaches zero, which is exactly why burn rate and runway are almost always discussed together rather than on their own. Investors watch burn rate closely because it defines how much room a founding team has to test a strategy before needing to raise again or reach profitability.

Frequently Asked Questions

• What's the difference between burn rate and runway?

  Burn rate is how much cash is spent per month, while runway is how many months of cash remain at that burn rate. Burn rate is the rate; runway is the resulting time horizon.

• Is burn rate the same as net loss?

  They're related but not identical. Net loss comes from the income statement and includes non-cash items like depreciation, while burn rate is a strictly cash-based measure of what actually left the bank account.

• What's considered a healthy burn rate?

  There's no single healthy number since it depends entirely on cash reserves, growth stage, and revenue trajectory. A burn rate that leaves 12 to 18 months of runway is a common comfort zone many startups aim to maintain.

• How often should burn rate be tracked?

  Monthly at minimum, and weekly during periods of rapid spending change, fundraising preparation, or when runway is getting short enough that timing decisions matter.

• What causes burn rate to spike unexpectedly?

  Aggressive hiring, a jump in marketing spend without a matching revenue increase, and one-time costs like office buildouts or legal fees are the most common causes of a sudden increase in monthly burn.