ARR vs ACV: Definitions, Formulas & How to Use Both

DEFINITIONS — RECURRING REVENUE, TWO LENSES

ARR (Annual Recurring Revenue) is the annualised value of your recurring revenue — the predictable subscription revenue your business expects over the next twelve months. ACV (Annual Contract Value) is the annualised value of a single customer contract — what one customer is worth per year under their agreement. ARR describes the business; ACV describes the deal.

The relationship: ARR is (roughly) the sum of all ACVs, adjusted for churn, expansion and contraction. A business with 100 customers at £12k ACV has £1.2m ARR — until churn and upsells move it. Confusing them means confusing the health of the business (ARR) with the size of the average deal (ACV) — and they tell very different stories about very different things.

CALCULATION FORMULAS — GET THEM RIGHT

ARR = (total recurring revenue per month) × 12, including only recurring components — subscriptions, retainers, maintenance contracts. Exclude one-off fees: implementation, hardware, professional services. New ARR = ARR from new customers; expansion ARR = upsells and cross-sells; churned ARR = lost to cancellations; contracted ARR = signed but not yet live. Net new ARR = new + expansion − churned − contracted-down.

ACV = (total contract value ÷ contract length in years), again recurring-only for the pure definition — though many businesses quote ACV including first-year one-offs, which is fine as long as you are consistent and label it. Example: a 3-year, £90k contract (£30k/year licence) has £30k ACV (recurring-only) — the number that feeds ARR. For the profitability ratios these feed, see our YoY growth guide.

KEY DIFFERENCES — WHEN EACH MISLEADS

ARR misleads when it includes non-recurring revenue — the "ARR" inflated with one-off services is a vanity metric that collapses under diligence. It also misleads as a growth measure without its components: 20% ARR growth from new logos with 25% churn is a leaky bucket, not a healthy business. Always decompose ARR into new, expansion, churned and contracted.

ACV misleads when averaged blindly — a £50k average ACV hiding a split between £5k self-serve and £500k enterprise deals describes neither motion. Segment ACV by deal type, and track ACV trend within segments: rising enterprise ACV with falling SMB ACV tells a strategy story the average hides. Both metrics are honest servants and dangerous masters — define them precisely, then use them consistently.

HOW TO USE BOTH TO TRACK REVENUE GROWTH

Use ARR as the business health metric: track it monthly, decompose it religiously (new vs expansion vs churn), and set targets on net new ARR — the single number that captures whether the business is actually growing. The ARR bridge (starting ARR + new + expansion − churn = ending ARR) is the most important slide in the board pack; every number in it should be explainable.

Use ACV as the go-to-market metric: track it by segment to guide targeting (are we moving upmarket successfully?), by rep to coach performance, and against CAC to validate unit economics (CAC payback = CAC ÷ (ACV × gross margin) — the fundamental SaaS efficiency ratio). When ACV rises while win rates hold, pricing power is real; when ACV rises and win rates fall, you are pricing yourself out of deals. Our digital marketing for SaaS clients is built around these unit economics.

THE METRICS AROUND THEM — THE FULL PICTURE

ARR and ACV sit in a family: gross revenue retention (what % of ARR you keep excluding expansion — the stability measure), net revenue retention (including expansion — the growth-efficiency measure; best-in-class exceeds 120%), CAC payback period, LTV:CAC ratio, and the Rule of 40 (growth rate + profit margin ≥ 40 — the balanced-growth test). No single metric tells the story; the family together does.

Report them as a set, monthly, with trends — not snapshots. The trends reveal the narrative: NRR climbing while new ARR slows means the base is healthy but acquisition needs work; ACV rising with lengthening sales cycles means upmarket motion with its costs. Data without narrative is noise; the metrics are the vocabulary, not the story.

COMMON PITFALLS

Pitfall one: inconsistent definitions across teams — sales, finance and the board using different ARR calculations. Write the definitions down, once, centrally. Pitfall two: vanity ARR — including one-offs, counting unsigned pipeline, annualising monthly deals with high churn. Pitfall three: ignoring the components — celebrating ARR growth while churn eats the base.

Pitfall four: ACV vanity — quoting the biggest deals as typical. Pitfall five: measuring monthly but managing quarterly — the metrics need monthly review to catch drift early. Talk to us if your revenue metrics need an honest audit — clean definitions and honest reporting transform board conversations.

ARR VS ACV — FAQs