Average Revenue Per Account (ARPA)

Why it matters

ARPA sets the ceiling on your entire business model. At $20 ARPA you need 4,167 accounts to hit $1M ARR; at $500 you need 167, and those are two completely different companies. It also decides which acquisition channels you can afford: low ARPA means self-serve, content, and product-led motion, because a sales call that costs $300 to run does not pay back on a $29 plan. Watch the mix, not just the average: 10 accounts at $1,000 plus 200 at $30 produce a blended ARPA that describes neither segment. Rising ARPA usually signals pricing power or a move upmarket; falling ARPA usually means your cheapest plan is winning, which quietly breaks your CAC math.

Formula

ARPA = MRR / number of active paying accounts

Worked example

MRR of $12,000 across 80 paying accounts gives ARPA of $150 per month. But if 5 of those accounts are on a $1,000 enterprise plan, the remaining 75 average only $93, so the headline $150 overstates what a typical new signup is actually worth.

Common mistakes

• Confusing ARPA with ARPU: ARPA counts accounts (companies), ARPU counts individual users. A 50-seat customer is one account but 50 users, and the two metrics diverge fast in B2B.
• Including free or trial accounts in the denominator, which drags ARPA down and makes payback math look worse than it is.
• Reporting one blended ARPA when your base is really two segments; segment by plan before making pricing or CAC decisions.

Related terms

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