Cash Runway

The estimated length of time a company can continue operating before running out of cash, based on its current cash balance and cash burn rate.

Cash runway is a critical liquidity metric for unprofitable, early-stage, or pre-revenue companies, particularly in the biotechnology, technology, and startup sectors. It measures the estimated length of time a company can continue operating before running out of cash, assuming its current rate of spending remains constant. This metric provides a clear timeline of the company's financial survival limit under its existing operating model. To calculate cash runway, investors divide the company's total cash and cash equivalents by its cash burn rate (typically measured on a monthly or quarterly basis). The cash burn rate represents the net cash outflow from operations and capital expenditures over that period. Because this calculation assumes no new revenue or funding, it represents a conservative, worst-case scenario timeline. Investors monitor cash runway to assess the urgency and likelihood of upcoming capital raises, which can dilute existing shareholders through secondary stock offerings or burden the company with expensive debt. A short runway (typically under 12 months) increases the risk of emergency financing on unfavorable terms or outright insolvency. Conversely, a long runway gives management the operational flexibility to reach key milestones, such as clinical trial readouts or product launches, which can unlock higher valuations before they need to raise more capital.

Company A is a clinical-stage biotech firm with $50 million in cash and cash equivalents on its balance sheet. Its quarterly cash burn rate is $10 million (or $3.33 million per month). The cash runway is calculated as $50 million / $10 million = 5 quarters, which is equivalent to 15 months of operating runway.