ARR and MRR: How recurring revenue is measured and interpreted

Monthly Recurring Revenue (MRR) and Annual Recurring Revenue (ARR) describe the recurring revenue base of a subscription business at a point in time. MRR expresses that base monthly, while ARR annualizes it. For venture investors evaluating subscription businesses, the pair provides a common view of recurring scale and momentum.

A consistent calculation should focus on recurring subscription or contract revenue and separate one-time implementation, services, and other non-recurring income. Stripe describes ARR as recurring revenue annualized over twelve months and MRR as the monthly equivalent.

How ARR and MRR are calculated

MRR = total normalized monthly recurring revenue

ARR = MRR × 12

A company with annual or multi-year contracts can arrive at the same result by normalizing active recurring contracts to a monthly or annual value. The important point is consistency in what the company treats as recurring revenue.

ARR can also be reconciled from one period to another:

Ending ARR = Starting ARR + New ARR + Expansion ARR − Contraction ARR − Churned ARR

That bridge is often more informative than the ending figure alone because it shows how the recurring base changed.

Worked example

Consider a SaaS company that begins the year with $2.0 million in ARR and finishes with $2.8 million. During the year, it adds $900,000 from new customers and $300,000 from expansion within existing customers. It loses $250,000 from churn and another $150,000 from customers reducing their subscriptions.

$2.0M + $0.9M + $0.3M − $0.25M − $0.15M = $2.8M ARR

Its ARR growth rate for the year is 40%. The ending ARR shows the current recurring revenue scale. The bridge adds the operating context behind that change.

How venture investors interpret ARR and MRR

ARR is commonly used to understand the scale and growth of subscription businesses. Investors usually examine the absolute level, growth rate, composition, and development over time rather than treating the ending ARR figure as sufficient on its own.

The quality of ARR depends on the economics underneath it. A company growing through strong customer retention and expansion has a different profile from one replacing heavy churn with new sales every quarter. ARR therefore becomes more useful when read alongside retention, gross margin, customer concentration, sales efficiency, and cash consumption.

MRR can be more useful when operating changes are happening quickly. Monthly movements can surface changes in new sales, expansion, contraction, or churn before those changes become obvious in annual comparisons.

Common mistakes

Including one-time revenue

Professional services, setup fees, implementation projects, and other one-time charges can overstate recurring scale when they are included in ARR or MRR.

Treating ARR as accounting revenue

ARR is an operating metric based on the recurring revenue run rate. Revenue recognized in financial statements follows accounting rules and can differ materially from ARR during the same period.

Mixing contracted and live revenue

Signed contracts that have not started can be economically meaningful while still falling outside a definition based on active recurring revenue. Companies should make clear whether they are reporting live ARR, contracted ARR, or another variation.

Ignoring the ARR bridge

Two companies can add the same amount of ARR through very different combinations of new sales, expansion, contraction, and churn. Looking only at beginning and ending ARR can hide those differences.

Changing the definition over time

Treatment of discounts, usage components, pilots, annual prepayments, and services should remain consistent. Changes in methodology can create artificial growth or contraction.

Limitations

ARR and MRR describe recurring revenue scale. They provide limited information about profitability, retention, gross margin, customer concentration, cash collection, or capital efficiency. A company with attractive recurring-revenue growth can still have weak underlying economics.

They also become less representative as the business model moves away from fixed recurring subscriptions. Usage-based, transactional, marketplace, and hybrid revenue models usually need additional measures to explain the business accurately.

Diligence request: reconcile reported ARR to the active-contract schedule on the measurement date. List contracted-but-not-live customers separately, with start dates and cancellation assumptions. Treto's portfolio workspace can retain the reported ARR, its definition and supporting file as later company updates arrive.