A burn rate is the speed at which a company is using up its cash, usually measured per month, before it becomes profitable. It tells founders and investors how long the current cash will last if nothing changes, often called the company’s “runway.”

Basic definition

  • Burn rate is essentially negative cash flow: how much cash leaves the business each month net of what comes in.
  • Startups and early‑stage companies watch this metric closely because they often operate at a loss while they grow.

Gross vs net burn rate

  • Gross burn rate: total monthly cash outflow, such as salaries, rent, marketing, and other operating costs, regardless of revenue.
  • Net burn rate: gross burn minus cash inflows (revenue), showing how much cash the company actually loses per month after sales.

How it’s calculated

  • Gross burn rate formula: sum of all cash expenses over a period (commonly one month).
  • Net burn rate formula: total expenses minus total revenue for the period, giving a monthly loss figure.

Burn rate and runway

  • Cash runway estimates how many months the company can survive at the current net burn before cash runs out.
  • Runway is typically calculated as current cash balance divided by monthly net burn rate, helping guide funding and cost decisions.

Why burn rate matters now

  • A high burn rate signals the company may hit financial distress sooner and may need to cut costs, grow revenue faster, or raise more capital.
  • In recent fundraising environments where capital is tighter, investors often push startups to lengthen runway by lowering burn and aiming for more efficient growth.

Information gathered from public forums or data available on the internet and portrayed here.