Monthly recurring revenue, or MRR, is a metric that measures the amount of money a company receives on a monthly basis from its recurring revenue streams. This figure excludes one-time or non-recurring payments, such as customer setup fees. MRR is an important metric for companies with subscription-based models because it provides insight into the growth of their business. For example, if a company's MRR is increasing month over month, it indicates that the company is adding more customers and/or upselling existing customers to higher-priced plans.