The burn multiple, popularized by David Sacks, divides net burn by net new ARR for the same period. A burn multiple of 1.0 means the company is generating $1 of new ARR for every $1 of cash burned; below 1 is excellent, 1 to 2 is healthy, 2 to 3 is acceptable in a hot market, above 3 is concerning.
The metric is increasingly the headline efficiency measure for growth-stage SaaS, especially in slower funding environments. It penalizes 'growth at any cost' and rewards capital-efficient scaling.