MRR to ARR Calculator

Why MRR and ARR matter for subscription businesses

Monthly recurring revenue and annual recurring revenue measure predictable income from active subscriptions, stripped of one-off fees, implementation charges and professional services. ARR is MRR multiplied by twelve, the same revenue viewed on an annual basis. Which one gets reported depends on the audience. Board decks and investor updates lean on ARR because the number is larger and the year-on-year framing is cleaner. Operating dashboards lean on MRR because monthly movements are easier to debug and quicker to react to.

Neither is a standardised accounting measure. Both are company-defined, which is why two businesses quoting the same ARR can be counting different things. Securities regulators treat metrics of this kind as requiring their own explanation: the guidance the United States Securities and Exchange Commission issued on key performance indicators in management discussion and analysis, which applies to foreign private issuers as well as domestic filers, expects a metric to be accompanied by a clear definition of how it is calculated, why it is useful, and how management uses it.

The four components of MRR movement

The headline number hides a lot of mechanics. MRR moves through four distinct flows each month.

New MRR is revenue from customers who signed up this month, the output of the acquisition engine across sales, marketing and product-led growth.

Expansion MRR is revenue from existing customers who upgraded, added seats or moved to a higher tier. It compounds, because a customer that grows inside the product carries no new acquisition cost.

Contraction MRR is revenue lost from customers who downgraded, removed seats or moved to a cheaper tier. A contraction line that persists without reversing often shows up before churn does.

Churn MRR is revenue lost from customers who cancelled outright. It draws the most attention because it is the hardest to reverse: a cancelled customer rarely returns without substantial effort.

Net new MRR is New plus Expansion minus Contraction minus Churn. That is the bottom-line movement for the month, and it decides whether ARR grew or shrank.

What the default figures show

The defaults describe a business starting the month on 500,000 MRR, adding 50,000 new and 10,000 expansion, losing 3,000 to contraction and 8,000 to churn. Gross new MRR is 60,000, net new is 49,000, ending MRR is 549,000, and ARR lands at 6,588,000.

The retention row is where the interesting part sits, though. Net revenue retention comes out at 99.8%, just under the line. Strip out the new customers and this business is very slightly smaller than it was at the start of the month: 10,000 of expansion did not quite cover 11,000 of contraction and churn. The ARR figure grew, but it grew entirely on acquisition. That distinction carries more information than the headline figure does, and the headline figure does not show it.

Gross MRR vs net MRR growth

Gross new MRR is New plus Expansion, everything moving in the right direction. Net new MRR is that figure after Contraction and Churn come out. For an early-stage business the two often look similar, because churn is small next to new. For a mature one the gap can be enormous. A business adding 500,000 of gross new MRR while losing 400,000 to churn has 100,000 of real growth, even though its sales and marketing teams produced the same gross output as a business with no churn at all.

The ARR conversion and why it sometimes overstates

Annualising assumes every subscription renews at its current rate for a full year. For a business with low monthly churn that holds up well enough, since the annualised figure represents run-rate revenue if the current state persists. It overstates badly when churn is high. At 5% monthly churn, compounding leaves about 54% of the starting base after twelve months, so multiplying by twelve counts revenue that will not arrive. Some companies report both a headline ARR at twelve times MRR and a separate retention-adjusted figure built from trailing cohort behaviour.

Patterns Commonly Observed in MRR

Three mistakes turn up repeatedly in dashboards built in-house.

The first is counting an annual prepayment as MRR in the month the cash lands. The revenue is real, but it is not recurring monthly, so it inflates one month and manufactures a collapse in the next. Amortising it across twelve months keeps the metric aligned with how the revenue is actually earned, which is also how revenue recognition standards such as IFRS 15 Revenue from Contracts with Customers treat a contract delivered over time.

The second is folding one-off fees into MRR. Setup, implementation and consulting revenue are legitimate income, but mixing them into a recurring-revenue metric dilutes exactly the signal the metric exists to carry.

The third is double-counting a mid-month upgrade as both a contraction on the old plan and new MRR on the new one. That inflates gross new MRR and contraction simultaneously while leaving net new correct, so the error hides in plain sight on the two lines investors read most closely. Recording the difference as expansion avoids it.

How investors read the numbers

An investor asking about MRR growth is usually after four things: gross new MRR last month, net new MRR last month, the net new trend across the last six months, and trailing twelve-month net revenue retention. NRR is starting MRR plus expansion minus contraction minus churn, divided by starting MRR, which is the same as one plus the net movement of the existing base over starting MRR.

Together those four show whether growth is accelerating or slowing, whether the existing base is a source of revenue or a drag on it, and whether acquisition is getting more efficient. NRR above 100% means the existing base grows revenue with no new customers at all, so acquisition compounds on top of a rising floor. Below 100% the floor is sinking, and new sales have to cover the shortfall before any growth registers. Published benchmark ranges for what constitutes strong retention are compiled by several venture firms and vary by segment, contract size and how each firm defines the measure.