Net MRR growth rate

Net MRR growth rate is the percentage change in total MRR from one month to the next. It combines four MRR movements into a single growth figure: new business MRR from first-time customers, expansion MRR from existing customers who upgrade or add seats, contraction MRR from customers who downgrade, and churned MRR from customers who cancel.

Ending MRR = Beginning MRR + New MRR + Expansion MRR - Contraction MRR - Churned MRR

This makes net MRR growth rate the ultimate health metric for a SaaS business. A positive growth rate means the business is adding more revenue than it is losing. A negative growth rate means revenue is declining. The magnitude of the rate determines how quickly the business is scaling or shrinking.

The compounding nature of MRR makes growth rate extraordinarily powerful. A business growing MRR at 10% month-over-month will roughly triple in size over 12 months. At 15% month-over-month, it will grow approximately 5x. Even small differences in monthly growth rate produce dramatic differences in outcomes over time, which is why early-stage investors focus so heavily on this metric.

However, growth rate must be interpreted in context. A 20% monthly growth rate on a 10,000 pound MRR base is 2,000 pounds of incremental revenue. The same 20% rate on a 1,000,000 pound base requires 200,000 pounds of incremental revenue, which is vastly harder to achieve. Growth rates naturally decelerate as the base grows, and the rate of deceleration matters as much as the rate itself.

The basic calculation subtracts beginning MRR from ending MRR, divides by beginning MRR, and multiplies by 100.

For example: beginning MRR is 300,000 pounds. During the month, the business adds 25,000 in new MRR, 12,000 in expansion MRR, loses 6,000 to contraction, and 9,000 to churn. Ending MRR = 300,000 + 25,000 + 12,000 - 6,000 - 9,000 = 322,000. Net MRR growth rate = (322,000 - 300,000) / 300,000 x 100 = 7.3%.

Breaking the growth rate into its components reveals the quality of growth. The same 7.3% growth rate could come from strong new business and weak retention, or from moderate new business and excellent expansion with low churn. The component breakdown determines whether growth is sustainable.

A metric tree decomposes net MRR growth into its four components: new, expansion, contraction, and churn. Each component further breaks down into the operational drivers that influence it. This gives leadership a complete map of where growth is coming from and where it is being lost.

The tree makes the growth equation tangible. If net MRR growth is slowing, the tree identifies whether the deceleration comes from weakening new business (a go-to-market problem), declining expansion (a customer success or pricing problem), increasing contraction (a value perception problem), or rising churn (a retention problem). Each diagnosis leads to a fundamentally different set of actions.

The highest-quality growth comes from a combination of steady new business and strong expansion with low churn. This signals that the business acquires the right customers and delivers increasing value over time.

The T2D3 framework (triple, triple, double, double, double) is a common benchmark for venture-backed SaaS. It implies roughly tripling ARR in years one and two, then doubling in years three through five. Translated to monthly MRR growth, this means starting above 10% and gradually decelerating to around 5% as the base scales. Businesses that maintain growth rates above these thresholds at each stage are considered exceptional.