ARR is the primary revenue metric for subscription and SaaS businesses. It is calculated by taking the monthly recurring revenue (MRR) and multiplying by 12, or by annualising the value of active contracts. Unlike total revenue, ARR excludes one-time implementation fees, professional services, and non-recurring revenue streams — it is the predictable, contractually committed component of revenue that investors can project forward.
The importance of ARR lies in its predictability. A company with $1M ARR and a 95% net revenue retention rate has a credible starting point for next year: before signing a single new customer, they can expect approximately $950K in revenue. This floor allows for more confident hiring plans, capital allocation decisions, and investor conversations. It is why subscription businesses command revenue multiples that transactional businesses do not.
When communicating ARR, precision matters. Investor-grade ARR should exclude non-recurring revenue, normalise multi-year contracts to their annual value, and be computed on a consistent basis across periods. Common manipulations include: including one-time payments in ARR, counting contracted but unstarted revenue, and forward-projecting current deals. Investors who identify these practices in due diligence will discount the entire ARR figure, not just the manipulated portion.