Monthly recurring revenue from the two numbers that create it — and, unlike most MRR calculators, this one also shows what your churn rate does to that revenue over the next year if you add nobody new.
Enter your customer count and average revenue per customer — your MRR appears here instantly.
MRR — monthly recurring revenue — is the predictable subscription revenue a business collects in a month, with one-off sales, setup fees and other non-recurring income stripped out. It is the number a subscription business steers by because it smooths away the noise: an annual plan paid upfront is cash in the bank today, but it is one-twelfth of that payment in MRR terms, and treating the whole payment as this month's revenue makes growth look dramatic in the month of the sale and miserable the month after. MRR's weakness is the mirror of its strength — it says nothing about costs, cash timing or whether the customers creating it are about to leave. That last gap is why this calculator asks for churn: two businesses can report identical MRR today while one is compounding and the other is quietly draining away.
MRR = Paying customers × Average revenue per customer per month. Annual recurring revenue is the same figure scaled: ARR = MRR × 12. When customers pay different amounts, use the true average — total recurring revenue divided by customer count — rather than your headline plan price, which usually flatters the result. The projection on this page applies your monthly churn rate repeatedly: each month keeps (1 − churn) of the customers from the month before, so after n months, MRR ≈ current MRR × (1 − churn)^n, assuming no new customers and no price or plan changes. It is deliberately a churn-only view — the floor your growth has to beat, not a forecast.
1. Count only paying customers on recurring plans — exclude free tiers, trials that have not converted, and one-off buyers.
2. Enter your real average revenue per customer per month: total recurring revenue for a recent full month, divided by that month's customer count. Annual plans count at their monthly equivalent, not at what was invoiced.
3. Add your monthly churn rate if you know it (our churn calculator can work it out from customer counts). Read the 6- and 12-month figures as what happens if growth stopped today — every new customer you add improves on them.
A small SaaS has 200 paying customers averaging $49 a month: MRR is 200 × 49 = $9,800, and ARR is 9,800 × 12 = $117,600. With monthly churn of 3%, about 6 customers — roughly $294 of MRR — leave each month. If no new customers arrived, compounding that churn leaves about $8,163 of MRR after 6 months and about $6,800 after 12 months, from roughly 139 of the original 200 customers. Standing still is therefore not flat — at 3% churn the business must win back about a third of its revenue every year just to report the same MRR twice.
MRR changes through exactly four doors: new customers, expansion (existing customers paying more — upgrades, seats, usage), contraction (downgrades), and churn (customers leaving entirely). Reporting only the total hides which door did the work, and they are not equal in value: expansion revenue from customers you already have is usually the cheapest growth there is, while growth bought by out-marketing a churn problem gets more expensive every month, because the base you must replace keeps growing. A useful discipline is to watch net MRR movement alongside this total: if new MRR is strong but contraction plus churn quietly eats most of it, the projection above is the future arriving on schedule.
Counting annual payments in one month: the classic error — it spikes MRR in the sale month and invents a collapse the next. Always divide by the plan length. Including one-off revenue: setup fees, onboarding charges and product sales are real money but they are not recurring; including them makes MRR a vanity figure that next month cannot repeat. Using the headline price instead of the average: discounts, legacy plans and mixed tiers mean the average customer almost never pays the price on your pricing page. Multiplying MRR by 12 and calling it revenue: ARR is a run-rate — a snapshot scaled up — not money earned; churn and growth both make the actual year different.
What is the difference between MRR and ARR? Scale only. ARR is MRR × 12, used by businesses whose typical contract is annual. Neither is a promise about the coming year — both describe the present base at a yearly rate.
How should I count annual-plan customers? At their monthly equivalent: an annual payment of $490 counts as about $40.83 of MRR, regardless of when the cash arrived. Counting it whole in one month is the single most common MRR distortion.
Is the churn projection a forecast? No — it is a stress test. It assumes zero new customers, zero expansion and a constant churn rate, none of which will be exactly true. Its job is to show the size of the hole growth has to fill, not to predict the future.
Are my numbers uploaded? No. The calculation runs entirely in your browser — nothing you type here is sent anywhere.