Expansion MRR is the new monthly revenue that comes from customers you already have.

It matters because it grows revenue without winning a new customer.

A new customer has to be found, convinced and set up. An upgrade from an existing customer needs no new lead, no trial and no new card. The account is already there and already paying.

Expansion is also what offsets churn. When expansion MRR is larger than the MRR you lose to cancellations and downgrades, revenue from existing customers grows by itself. That is called net negative churn.

Add up every MRR increase from customers who were already paying.

expansion MRR = sum of MRR increases from existing customers in the period
expansion rate = expansion MRR ÷ MRR at the start of the period × 100

Only customers who were paying at the start of the period count. A customer who signs up and upgrades in the same month is new MRR at the higher price.

Expansion of $2,000 is larger than the $1,500 lost, so the customers you started with now pay $50,500, before any new sale. Measured over a year, that same comparison is net revenue retention.

Expansion comes from four places.

• Plan upgrades. A customer moves to a higher plan with more features or higher limits.
• More seats. An account adds users as more of the team starts using the product.
• Add-ons. A customer buys an extra module or service on top of the plan they have.
• Usage. On usage-based pricing, the bill grows as the customer does more, when that higher level repeats month after month.

You grow it by giving customers a reason to buy more as they get more value.

• Price on something that grows with use. Seats, contacts, volume or usage let the bill follow the value the customer gets.
• Put the upgrade where the limit is. The moment a customer reaches a plan limit is the moment to show the next plan and its price.
• Sell add-ons that solve the next problem. A customer who has the core product working is the right audience for the feature that comes after it.
• Watch accounts that are close to a limit. An account at most of its seats or volume is ready for a conversation about the next plan.

These mistakes overstate expansion.

• Counting new customers. Only customers who were already paying at the start of the period can expand.
• Counting reactivations. A customer who cancelled and came back is reactivation MRR, not expansion.
• Netting it against downgrades. Report expansion and contraction as separate lines. One net number hides both.
• Counting one-time charges. A one-off overage fee is revenue this month, but it does not recur.