Expansion MRR
DEFINITION
Expansion MRR is the additional monthly recurring revenue a subscription business gains from existing customers within a month, through upgrades, added seats, cross-sells, or usage increases.
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RELATED TERMS
Expansion MRR is the additional monthly recurring revenue a subscription business gains from existing customers within a month, on top of what they were already paying. It comes from upgrades, added seats or units, cross-sells, and increases in usage-based charges, measured only for customers who were active at the start of the month.
Expansion MRR is the monthly recurring view of expansion revenue, and it is one of the standard movements finance and revenue operations teams track when they break down how recurring revenue changed. Read alongside new MRR, contraction MRR, and churned MRR, it shows how much of the month's growth came from deepening existing accounts rather than winning new ones. A subscription platform such as Recurly records the plan changes and add-ons that create expansion MRR, so the figure can be built from actual billing events. Recurly also records and invoices usage events, but usage-based amounts are excluded from its MRR calculation, so usage does not itself add to expansion MRR the way plan changes and add-ons do.
Why expansion MRR matters for subscription businesses
Expansion MRR is usually the most capital-efficient growth a subscription business has, because the customer is already acquired, onboarded, and paying. Growing an existing account tends to cost less than winning a new one, so a healthy expansion MRR line lifts growth without a matching rise in acquisition spend.
It is also central to net revenue retention. When expansion MRR is large enough to outweigh contraction and churn, the existing customer base grows on its own, which is what pushes net revenue retention above 100 percent. Tracking expansion MRR as its own movement keeps that dynamic visible and gives customer success and product clear feedback on where accounts are deepening.
How expansion MRR works
Expansion MRR counts increases in recurring revenue from customers who were already active at the start of the month. The common sources are:
Upgrades from a lower plan or tier to a higher one.
Additional seats, licenses, or units added to an existing subscription.
Cross-sells, where a customer adds another product or module.
Usage-based increases that raise the recurring amount billed.
Revenue from customers acquired during the month is new MRR, not expansion, and decreases from existing customers are contraction MRR. Keeping these movements separate is what lets a team read the month's recurring revenue change as distinct lines rather than one net number.
How to calculate expansion MRR
Expansion MRR is the sum of recurring increases from existing customers during the month. Written as a plain formula:
Expansion MRR = Sum of MRR increases from existing customers during the month (upgrades + added units + cross-sells + usage increases)
It is one of the terms in the standard MRR bridge, which reconciles starting and ending MRR:
Ending MRR = Starting MRR + New MRR + Expansion MRR - Contraction MRR - Churned MRR
And it feeds net revenue retention, which measures how the starting base changed:
Net revenue retention = (Starting MRR + Expansion MRR - Contraction MRR - Churned MRR) / Starting MRR
To calculate expansion MRR for a month:
Identify the customers who were active at the start of the month.
For each, find the increase in their recurring charge during the month from upgrades, added units, cross-sells, or higher usage.
Exclude customers acquired during the month, which is new MRR.
Exclude decreases, which are contraction MRR, and lost customers, which are churned MRR.
Add the increases together to get expansion MRR for the month.
Illustrative example (hypothetical numbers):
Starting base: 300 customers contributing 120,000 dollars in starting MRR.
During the month, 25 customers upgrade, each adding 80 dollars.
Separately, 10 customers add a second product at 120 dollars each.
No new customers are counted here, and no existing customer reduces spend.
Upgrade expansion is 25 times 80 dollars, or 2,000 dollars. Cross-sell expansion is 10 times 120 dollars, or 1,200 dollars. Expansion MRR is 2,000 plus 1,200, or 3,200 dollars. Against 120,000 dollars of starting MRR, that is an expansion rate of 3,200 divided by 120,000, or about 2.7 percent for the month.
Benefits and examples
Tracking expansion MRR as its own movement gives a subscription business several advantages:
A read on capital-efficient growth, since expansion usually costs less than new-logo acquisition.
Visibility into net revenue retention, because expansion is the term that offsets contraction and churn.
A signal of product value, as accounts expand when they get more from the product over time.
Cleaner forecasting, since expansion trends by plan and cohort help predict base growth.
For example, a company with flat new sales in a month can still grow its recurring revenue if expansion MRR outpaces contraction and churn. Recurly captures the upgrades and add-ons that produce expansion, so the movement can be reported rather than estimated. Usage events are recorded and invoiced as well, but usage-based amounts are excluded from Recurly's MRR calculation, so they do not add to expansion MRR the way upgrades and add-ons do.
Frequently asked questions
What is expansion MRR? It is the additional monthly recurring revenue gained from existing customers in a month, through upgrades, added seats, cross-sells, or higher usage. It counts only customers who were active at the start of the month.
What is the difference between expansion MRR and new MRR? Expansion MRR comes from existing customers increasing their spend. New MRR comes from customers acquired during the month. Separating them shows how much growth came from the current base versus new sales.
How does expansion MRR relate to net revenue retention? Expansion MRR is added to the starting base while contraction and churn are subtracted, so net revenue retention rises with expansion. When expansion outweighs contraction and churn, net revenue retention exceeds 100 percent.
Is expansion MRR the same as upsell? Upsell, meaning an upgrade to a higher tier, is one source of expansion MRR. Expansion MRR is broader and also includes added seats or units, cross-sells, and usage-based increases.
