This calculator determines monthly recurring revenue (MRR) for a Series A business from active recurring customers and average monthly recurring revenue per customer. It also shows annualized recurring revenue and optional growth from a prior-month MRR baseline.
Series A teams can use the result for board reporting, planning, and consistency checks across billing systems. Include only predictable recurring subscription revenue; exclude one-time implementation fees, pass-through charges, and nonrecurring services unless company reporting policy explicitly treats them as recurring.
1. Count active recurring customers
Use customers with active recurring subscriptions at the reporting date.
2. Enter average recurring revenue
Use normalized monthly recurring revenue per active customer.
3. Add prior MRR
Enter the previous month’s MRR to calculate growth; use zero if unavailable.
4. Review MRR and ARR
Use the annualized value as a run-rate, not as a forecast of recognized revenue.
MRR = Active recurring customers × Average monthly recurring revenue per customer ARR = MRR × 12 MRR growth = (Current MRR − Prior MRR) ÷ Prior MRR × 100
The method assumes the average revenue input is already normalized to a monthly recurring amount.
The main result is the recurring subscription revenue represented by one normalized month.
Apply a documented MRR policy consistently across contracts and periods.
Given: 850 customers, $420 average monthly recurring revenue, and $330,000 prior-month MRR.
Calculation: MRR = 850 × $420 = $357,000. ARR = $4,284,000. Growth = ($357,000 − $330,000) ÷ $330,000 = 8.18%.
Result: Current MRR is $357,000 with 8.18% month-over-month growth.
Yes, normalize recurring contract value to a monthly amount before including it in MRR.
Usually no, because setup fees are nonrecurring.
Use total qualified MRR divided by active recurring customers to derive a weighted average ARPA.
Billing schedules, usage charges, credits, and accounting recognition can differ from the recurring run-rate metric.
MRR growth reflects both customer count and revenue per customer, including upgrades and downgrades.