Net promoter score (NPS) is a market research metric that is based on a single survey question asking respondents to rate the likelihood that they would recommend a company, product, or a service to a friend or colleague. The NPS is calculated by subtracting the percentage of customers who provide ratings of 6 or lower (detractors) from the percentage of customers who provide ratings of 9 or 10 (promoters). The NPS can range from -100 (all customers are dissatisfied) to 100 (all customers are satisfied). The NPS is a simple and transparent way to assess customer satisfaction, loyalty, and enthusiasm with a company, product, or service.