In a subscription business, a single month's billing says little on its own. What is MRR is the question that truly matters: how much recurring and predictable revenue does the company generate each month, excluding one-off payments that will not recur.

The issue arises when MRR is mixed with one-time revenue, such as a separately billed implementation setup fee or an annual contract paid upfront. This mix inflates the figure for one month and deflates it the next, without any real change in the business performance.

In this guide, we explain what MRR is, how to calculate it step-by-step, and MRR vs ARR—the comparison that most frequently confuses founders and sales teams when preparing reports for investors or executive boards.

What is MRR and Why is It the Core Metric of B2B SaaS

MRR (monthly recurring revenue) is the predictable revenue that a subscription business expects to receive each month, calculated solely from active, recurring contracts. It does not include one-time payments, setup fees, or revenue that will not recur the following month.

It is the central metric of B2B SaaS because it summarizes business health month-over-month in a single number: if MRR grows steadily, the business is performing; if it stagnates or drops, there is an issue that no other isolated metric shows as quickly.

How to Calculate MRR Step-by-Step

• 1. List all active contracts for the month. Only current paying customers, excluding prospects or cancelled contracts.

• 2. Normalize each contract to its monthly value. An annual contract worth 1,200 euros translates to 100 euros of MRR, not 1,200 all at once.

• 3. Sum the monthly value of all contracts. The result is the total MRR for the month.

• 4. Exclude one-off payments. Setup fees, implementation services, or one-off consulting do not form part of the MRR, even if they were billed in that month.

The most common mistake in this calculation is the second step: treating an annual contract as if its entire value belongs to the month it was billed, instead of spreading it across the twelve months it actually covers.

MRR vs ARR: When to Use Each

ARR (annual recurring revenue) is simply MRR multiplied by 12. The difference lies not in the calculation, but in how each is utilized.

MRR is the operational metric: it serves to monitor trends month-over-month, detect issues quickly, and make short-term decisions. ARR is the communication metric: it is used for investor relations, to compare business size with other companies, or to project annual revenue in a business plan.

Using ARR for day-to-day operational decisions often obscures underlying issues that monthly MRR would highlight immediately, such as a temporary drop that is not yet visible on an annual scale.

Types of MRR (New, Expansion, Contraction, Churn)

• New MRR. Revenue generated by customers signing a contract for the first time that month.

• Expansion MRR. Additional revenue from existing customers who purchased more seats, upgraded their plan, or bought supplementary features.

• Contraction MRR. Revenue loss from customers who downgraded their plan or reduced usage without canceling entirely.

• Churned MRR. Revenue lost when a customer cancels their subscription completely.

Breaking down MRR into these four types is what actually explains the source of growth (or decline) month-over-month, which the total MRR figure alone cannot reveal.

Common Mistakes When Calculating MRR

• Including one-off fees in MRR. This inflates the metric for a specific month and creates an artificial drop the following month.

• Not accounting for temporary discounts. A customer on a 50% discount for 3 months does not contribute their full list price to MRR during that period.

• Mixing multiple currencies without consistent conversion. For businesses with international clients, this can distort monthly figures due to exchange rate fluctuations.

• Not segmenting MRR by type. Looking only at the total obscures whether growth is driven by new customers, expansion, or simply lower churn that month.

SalesDose: How We Connect MRR with the Sales Process

An MRR that grows solely by acquiring new customers, without account expansion, is often a sign that the sales process is failing to capitalize on the existing customer base.

At SalesDose, our sales consulting team analyzes the complete MRR breakdown (new, expansion, contraction, and churn) to identify at which stage of the sales process recurring revenue is being lost or gained, and through customer acquisition we ensure that new MRR does not depend on a single channel.

If your MRR is growing month-over-month but you do not know exactly why, talk to our team.

Frequently Asked Questions About MRR

These are the most common inquiries from founders and B2B sales teams managing MRR.

Does MRR include taxes?

No. MRR is calculated on the net contract value, excluding VAT or other taxes that the company collects but does not retain.

What is MRR vs ARR in simple terms?

MRR is the recurring revenue for a single month; ARR is that same revenue projected over a full year, multiplying the MRR by 12. One does not replace the other; they serve distinct purposes.

How is MRR calculated with annual plans?

By dividing the total annual contract value by 12, and adding that monthly value to the MRR of each corresponding month, rather than reporting the entire revenue in the month it was received.

What is an acceptable MRR churn rate?

It depends on the customer segment, but in B2B SaaS, a monthly MRR churn below 2% is generally considered healthy. A monthly churn rate above 5% typically indicates a major retention problem.

Is MRR useful for non-SaaS companies?

Yes, it benefits any business with recurring revenue from subscriptions or ongoing contracts, not just software companies: consulting firms with monthly retainers, managed services, or memberships can also be measured with MRR.

Calculating MRR accurately is the first step. The second, more critical step, is to break it down by type to understand if your growth is sustainable or relies on a single channel that could dry up at any moment.

Do you know if your MRR growth is driven by account expansion or purely by new customers? Let's review it together →