Expansion Metrics,
Defined

ARPA

Total recurring revenue divided by the number of accounts. The cleanest single read on whether your customer relationships are getting more valuable over time.

New logos usually dilute it, because new accounts typically start smaller than the average of a base that has had time to grow. Expansion raises it directly, which makes ARPA the metric most honestly tied to expansion performance.

The distinction that matters: ARPA can be inflated fragilely by stuffing the initial sale, which shows up as growth and then bills back as contraction at renewal. Milestone-triggered expansion raises the same number durably, because nothing was sold before the customer could use it.

ACV

The annualized value of a customer contract. Almost everyone treats it as a number set at signing, reports it as a single figure, and optimizes it at the point of sale.

That framing is the problem. ACV is a curve, not a point. The interesting question is not what a cohort's ACV was on day one but what it is eighteen months later, and the only thing that bends that curve upward is expansion.

New logos set a new ACV. Expansion raises the ACV of contracts you already hold, which is why a cohort's ACV eighteen months in tells you more about your operating model than any signing-day average ever will.

ASP

The average value of deals closed in a period. A sales-efficiency metric, and the one acquisition motions are usually tuned to optimize.

ASP is also where an honest objection to strategic unbundling lives: if you take things out of the initial sale, does your ASP not fall? Sometimes, slightly. Here is the full accounting.

A leaner initial sale closes faster, because the buyer is not negotiating over things they cannot use yet. The account then ends up above where the bundled deal would have landed, because an item presented at the milestone that earns it prices higher than the same item buried in a list on day one, while renewal contraction never arrives. Optimizing ASP in isolation optimizes one moment in a relationship that has many.

ARPU

Total revenue divided by users. A consumer and product-led metric, appropriate when the user is the buying unit.

For most business-to-business companies, ARPA is the better instrument, because the account is what expands and the account is what churns. If you are tracking ARPU on a base of multi-seat business accounts, you are measuring seat growth and calling it revenue growth.

NRR

What this year's customers are worth a year later: starting revenue, minus churn, minus contraction, plus expansion, on the same cohort.

New logos are excluded from the calculation entirely. You can have the best acquisition year in company history and your NRR will not move by a decimal, which surprises people every time.

Churn and contraction are bounded components; played perfectly, their best possible contribution is zero lost. Expansion is the only unbounded input, which is why you cannot defend your way above 100 percent. You can only expand your way there.

GRR

Retention with expansion excluded. It measures only what you kept, which means it mathematically cannot exceed 100 percent.

GRR is a useful hygiene number and a hard ceiling. It tells you how well you hold what you have, and it will never tell you anything about growth. A company reporting strong GRR and weak NRR is holding its base perfectly and expanding none of it.

LTV

How long a customer stays, multiplied by what they spend while they are with you. Two factors, which means exactly two levers.

Acquiring more customers does not change LTV. It adds customers at whatever LTV your current operating model produces, which makes LTV a property of the machine rather than of the pipeline.

Orchestrated expansion pulls both levers at once: more bought per customer, and longer lifetimes because a customer who can see their next milestone has a reason to stay. That is why LTV compounds rather than adds.

CAC

What it costs to acquire one new customer. Well understood, universally tracked, and genuinely necessary.

CAC stops at the first close. It says nothing about what it costs to acquire the second, third, or tenth dollar from that same customer, which is the entire blind spot the next metric exists to fill. Related and more useful than CAC alone: how fast it pays back, because payback speed is what funds aggression.

RAC

The total cost to acquire one dollar of revenue, expressed as a percentage. CAC counts customers and treats them as interchangeable; RAC follows the dollars, from every source.

Split by source, the spread is the whole argument. New-logo revenue carries the full load: marketing, sales development, commission. Typically 35 to 50 cents per dollar acquired. Expansion carries almost none of it, because the customer is already qualified and the trust already exists. Low teens. Renewals, single digits.

Same dollar of revenue, a third of the cost or less, depending entirely on where it came from. And the cheap dollars are usually the ones nobody is paid to go get.