The SaaS metrics that actually move the needle

Churn Rate

Churn rate is the percentage of customers (logo churn) or recurring revenue (revenue churn) that you lose over a given period. Customer churn = customers lost ÷ customers at the start of the period. Revenue churn = MRR lost ÷ MRR at the start. For B2B SaaS, monthly customer churn under about 2% is generally healthy; above 4–5% signals a leaky bucket that caps growth.

Net Revenue Retention (NRR)

Net revenue retention (NRR), also called net dollar retention (NDR), measures how much recurring revenue you keep from an existing customer cohort over a period, including expansion and after subtracting contraction and churn — but excluding new customers. NRR = (starting MRR + expansion − contraction − churn) ÷ starting MRR. Above 100% means the cohort grows on its own; best-in-class B2B SaaS sits around 120%+.

Gross Revenue Retention (GRR)

Gross revenue retention (GRR) measures the percentage of recurring revenue retained from an existing customer cohort, excluding any expansion. GRR = (starting MRR − contraction − churn) ÷ starting MRR. Because it ignores upsell, GRR is capped at 100% and exposes raw retention. Strong B2B SaaS GRR is around 90% or higher.

Customer Lifetime Value (LTV)

Customer lifetime value (LTV or CLV) estimates the total gross-margin revenue an average customer generates before they churn. The margin-adjusted formula is LTV = (ARPA × gross margin %) ÷ monthly churn rate, because average customer lifetime ≈ 1 ÷ monthly churn. Compared against acquisition cost, an LTV:CAC ratio of 3:1 or higher is the standard healthy benchmark.

SaaS Quick Ratio

The SaaS quick ratio measures growth efficiency: how much MRR you add for every dollar you lose. Quick ratio = (new MRR + expansion MRR) ÷ (churned MRR + contraction MRR). Popularised by Social Capital, a ratio of 4 or higher is excellent; below 1 means losses outweigh gains and the business is shrinking.

Monthly Recurring Revenue (MRR)

Monthly recurring revenue (MRR) is the predictable subscription revenue a business earns each month, normalised to a monthly figure. MRR = sum of all active subscriptions normalised to monthly value. It moves through five components: new, expansion, reactivation, contraction and churned MRR — and tracking each tells you what is actually driving growth.

Annual Recurring Revenue (ARR)

Annual recurring revenue (ARR) is the normalised value of recurring subscription revenue expressed over a year: ARR = MRR × 12. It counts only predictable, recurring contract value — excluding one-time fees, services and usage overages — and is the headline metric for enterprise-focused SaaS.

Average Revenue Per Account (ARPA)

Average revenue per account (ARPA), sometimes called ARPU, is the average recurring revenue generated per customer account in a period. ARPA = total MRR ÷ number of active accounts. Rising ARPA signals successful upsell, pricing power or a move upmarket, and it feeds directly into customer lifetime value.

Customer Acquisition Cost (CAC)

Customer acquisition cost (CAC) is the fully loaded cost of sales and marketing required to acquire one new customer. CAC = total sales & marketing spend in a period ÷ new customers acquired in that period. It is judged against lifetime value (LTV:CAC of 3:1 is the standard target) and CAC payback period (ideally under 12 months for B2B SaaS).

CAC Payback Period

CAC payback period is the number of months of gross-margin revenue it takes to recoup the cost of acquiring a customer. CAC payback = CAC ÷ (ARPA × gross margin %). Under 12 months is generally healthy for B2B SaaS; under 18 months is workable for enterprise. Shorter payback means less capital tied up in growth.

Expansion Revenue

Expansion revenue (expansion MRR) is additional recurring revenue generated from existing customers through upgrades, added seats, usage growth and cross-sells. It is what pushes net revenue retention above 100% and can drive net negative churn, where the existing base grows even before any new sales.

Cohort Analysis

Cohort analysis groups customers by when they started (their cohort) and tracks a metric — usually retention or revenue — for each group over time. It reveals whether retention is improving for newer cohorts and whether retention curves flatten, which indicates a stable core of customers who stay long-term.

LTV:CAC Ratio (LTV:CAC)

The LTV:CAC ratio compares how much a customer is worth over their lifetime (LTV) to what it costs to acquire them (CAC). LTV:CAC = customer lifetime value ÷ customer acquisition cost. A ratio around 3:1 is the common rule of thumb for healthy unit economics; below 1:1 you lose money on every customer, while a very high ratio (5:1+) often means you are under-investing in growth.

Rule of 40

The Rule of 40 is a SaaS health heuristic: a company’s revenue growth rate plus its profit margin should add up to at least 40%. Rule of 40 score = revenue growth rate (%) + profit margin (%). It balances growth against profitability — a company can grow fast and burn cash, or grow slowly and print profit, as long as the two together clear 40%.

Involuntary Churn

Involuntary churn is revenue lost when a payment fails rather than when a customer chooses to leave — expired cards, insufficient funds, or bank declines. It is distinct from voluntary churn (deliberate cancellation) and is largely recoverable through dunning (automated retries and payment-update prompts). Involuntary churn often accounts for 20–40% of total churn, so recovering it is one of the cheapest retention wins available.

Magic Number

The SaaS Magic Number measures how efficiently sales and marketing spend converts into new recurring revenue. Magic Number = net new ARR in a period ÷ sales and marketing spend in the prior period. A result above ~0.75 generally means your go-to-market is efficient enough to invest more; below ~0.5 suggests you should fix the funnel before spending more.

Burn Multiple

The burn multiple measures capital efficiency: how much cash you burn to add one dollar of new annual recurring revenue. Burn multiple = net burn ÷ net new ARR. Lower is better — under 1x is excellent, while above 2x means you are spending more than two dollars to generate each dollar of new recurring revenue, which is hard to sustain.

Annual Contract Value (ACV)

Annual contract value (ACV) is the average yearly revenue a single customer contract generates, normalized to a one-year basis. ACV = total contract value ÷ contract length in years. It differs from total contract value (TCV), which is the full multi-year value, and from ARR, which sums annualized recurring revenue across all customers. ACV is most useful for understanding deal size and segmenting customers.

Customer Health Score

A customer health score is a composite indicator that summarizes how likely an account is to renew, expand, or churn, based on signals like product usage, engagement, support history, and billing status. There is no single formula — it is a weighted model, and the most predictive versions use statistical methods such as survival analysis rather than fixed point-based rules. It turns scattered signals into one number that customer success teams can act on before churn happens.

Gross Margin

Gross margin is the percentage of revenue remaining after the cost of delivering your product — hosting, support, payment fees, and third-party services. Gross margin = (revenue − cost of revenue) ÷ revenue × 100. Healthy software SaaS runs 75–85% gross margin; it sets the ceiling on how much of each dollar can fund growth, and it feeds metrics like LTV and the Rule of 40.

Dunning

Dunning is the process of recovering failed recurring payments — automatically retrying declined charges and prompting customers to update expired or invalid cards. It is the primary defence against involuntary churn (revenue lost to payment failures rather than cancellations). Effective dunning recovers a large share of failed payments, often turning 20–40% of would-be churn back into retained revenue.

Logo Retention Rate (Logo Retention)

Logo retention rate is the percentage of customers (logos) you keep over a period, counting each account equally regardless of its revenue. Logo retention = customers retained ÷ customers at start × 100. It is the mirror image of customer (logo) churn, and it can diverge sharply from revenue retention when the accounts you lose are much larger or smaller than average.

Renewal Rate

Renewal rate is the percentage of contracts (or revenue) up for renewal in a period that actually renew. Renewal rate = contracts renewed ÷ contracts up for renewal × 100. Unlike churn, which is measured against the whole base, renewal rate is measured only against the cohort whose contracts came due — which makes it the cleanest signal for annual or multi-year subscriptions.

Activation Rate

Activation rate is the percentage of new signups or accounts that reach a defined first-value milestone — the moment they experience the core benefit of your product. Activation rate = users who activated ÷ new users × 100. It is an early leading indicator of retention: users who never activate almost always churn, so activation is where most retention is won or lost.

Trial-to-Paid Conversion Rate (Trial Conversion)

Trial-to-paid conversion rate is the percentage of free trials that turn into paying customers. Trial conversion = trials that converted to paid ÷ total trials started × 100. Benchmarks vary widely by model: opt-in trials (no card up front) convert lower, often 15–25%, while opt-out trials (card required) convert much higher, frequently 40–60%.

Contraction MRR

Contraction MRR is the recurring revenue lost when existing customers downgrade, remove seats, or reduce usage — without cancelling entirely. It is distinct from churned MRR (full cancellations) and the opposite of expansion MRR. Contraction MRR = sum of MRR reductions from retained customers in the period. It eats into net revenue retention even when logo churn looks healthy.

MRR Growth Rate

MRR growth rate is the percentage change in monthly recurring revenue from one period to the next. MRR growth rate = (MRR this month − MRR last month) ÷ MRR last month × 100. It nets the four MRR movements — new, expansion, contraction, and churn — into a single growth figure, and small monthly rates compound into large annual differences.

Net Promoter Score (NPS)

Net Promoter Score (NPS) measures customer loyalty from one question: how likely are you to recommend us, on a 0–10 scale. NPS = % promoters (9–10) − % detractors (0–6), giving a score from −100 to +100. It is a widely used satisfaction signal and a loose leading indicator of retention, but it is survey-based and self-reported, so it complements rather than replaces hard churn data.

Time to Value (TTV)

Time to value (TTV) is how long it takes a new customer to reach their first meaningful outcome with your product — the point where they experience real value. Shorter TTV drives higher activation, better trial conversion, and lower early churn, because customers who hit value quickly are far more likely to stick. It is measured in time (hours, days, weeks) from signup to the activation milestone.

Negative Churn

Negative churn (also called negative net revenue churn) is when expansion revenue from your existing customers exceeds the revenue lost to contraction and cancellations in the same period. The result: your installed base grows even with zero new customers. It is equivalent to net revenue retention above 100%, and it is one of the strongest signals of product-market fit and durable growth.

Total Contract Value (TCV)

Total contract value (TCV) is the full value of a contract across its entire term, including recurring fees plus any one-time charges like setup or professional services. TCV = (recurring value per year × term in years) + one-time fees. It differs from ACV, which annualizes only the recurring portion, and from ARR, which counts only the recurring run-rate.

Committed MRR (CMRR)

Committed MRR (CMRR) is your current MRR adjusted for known, contractually committed future changes: signed deals that have not started yet, plus scheduled expansions, minus cancellations you already know are coming. CMRR = current MRR + signed-but-not-started MRR − known upcoming churn. It is a forward-looking version of MRR that smooths the gap between booking a deal and recognizing its revenue.