Annual recurring revenue (ARR) is the annualised value of recurring subscription revenue, calculated by multiplying monthly recurring revenue by twelve. ARR provides a full-year view of the predictable revenue base and is the primary metric used for SaaS company valuation, typically expressed as an EV/ARR multiple.
Formula
ARR = MRR x 12In Depth
ARR takes the snapshot of MRR and projects it over a full year, providing the annualised run-rate of recurring revenue. For SaaS businesses, ARR is the single most important metric for investors, board reporting, and internal goal-setting.
The formula is straightforward: ARR = MRR x 12. Some companies calculate ARR by summing the annual contract values of all active customers. Both approaches should yield similar results for businesses with consistent monthly revenue.
ARR milestones are significant markers in a SaaS company's journey. Reaching £1M ARR validates product-market fit. £5M ARR often triggers Series A/B fundraising. £10M+ ARR is typically required for larger growth rounds. Each milestone commands different valuation multiples and investor expectations.
SaaS valuations are commonly expressed as EV/ARR multiples. A UK SaaS company at £5M ARR growing 80% year-over-year might trade at 15-20x ARR, while one growing 30% might command 5-8x. The correlation between growth rate and valuation multiple is strong.
FP&A teams should track both point-in-time ARR (the current monthly run-rate annualised) and committed ARR (including signed contracts not yet live). The gap between committed and live ARR provides visibility into near-term revenue growth.
For UK SaaS companies, ARR calculations should be consistent with revenue recognition under IFRS 15 or FRS 102, though ARR as a metric does not need to match GAAP revenue exactly — it serves as an operational rather than accounting measure.
Real-World Example
A UK vertical SaaS company reaches £3.6M ARR (£300K MRR) and seeks Series A funding. The company is growing MRR at 8% month-over-month (approximately 150% annualised). Comparable UK SaaS companies at this stage trade at 12-18x ARR. The FP&A team builds a model showing ARR reaching £8M within 18 months, supporting a fundraise at 15x trailing ARR (£54M pre-money valuation).
Related Terms
Enterprise value (EV) represents the total value of a business, combining market capitalisation with...
Monthly recurring revenue (MRR) is the predictable, normalised revenue a subscription business earns...
Customer lifetime value (LTV or CLV) is the total revenue a company expects to earn from a customer ...
Churn rate measures the percentage of customers or revenue lost over a given period. Customer churn ...
Net revenue retention (NRR) measures the percentage of recurring revenue retained from existing cust...
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