CAC payback calculator
How many months until a new member pays back what it cost to acquire them.
CAC payback is the single fastest way to know whether your acquisition is sustainable. A studio spending $200 to get a member who pays $80/month at 70% gross margin recoups that spend in about 3.6 months. A studio spending $400 for the same member recoups in 7 months, which is still healthy. A studio spending $900 to acquire a member who churns at month 8 is quietly going broke.
The formula is straightforward: CAC divided by (ARPM times gross margin). What's not straightforward is being honest about your inputs. Include intro-offer discounts in CAC. Don't count members who never paid full price.
Use this calculator before you renew an ad contract, decide whether to bring on a part-time marketer, or set a referral bonus.
Total marketing + sales spend divided by new members acquired in the same period.
ARPM. Membership dues plus retail and add-ons, averaged over a year of paying members.
Revenue minus the variable cost of serving that member (instructor pay, processing fees, supplies). Most studios run 60–80%.
How we calculate this
Months to payback = CAC ÷ (ARPM × gross margin %)
We use gross profit per month (revenue times margin) rather than raw revenue. That keeps the result honest: it's the cash actually available to recoup your acquisition spend after paying instructors and processing.
FAQ
What is CAC payback period?
CAC payback is the number of months it takes for the gross profit from a new member to equal what you spent to acquire them. Lower is better. Most healthy studios target under 12 months.
How do I calculate my real CAC?
Add up everything you spent on getting new members over a defined period (ads, referral bonuses, intro-offer discounts, the fraction of front-desk and owner time spent on sales) and divide by the number of new paying members from that same period. Don't include members who came in on a free trial and never converted.
What gross margin should I use?
Take a paying member's monthly revenue, subtract the variable cost of serving them (instructor pay attributable to that member, processing fees, towel service, retail COGS) and divide by revenue. Most boutique studios land between 60% and 80%. If you don't know yours, use 70% as a starting point.
Why does shorter CAC payback matter?
Cash. A 6-month CAC payback means you can reinvest profits into the next acquisition cycle twice as fast as an 18-month payback. It also means a member who churns at 9 months still leaves you in the black.
How does Chronix Hub help me track this?
Chronix Hub records every new client, their first payment, and their tenure. The reports page shows revenue per active member, and the CRM tracks intro-offer conversion. The full CAC calculation still requires you to add your ad spend, but the denominator (new paying members per month) is automatic.
Want this number live from your real data?
Chronix Hub tracks every new client and their first payment. Your CAC payback updates as you go — no spreadsheet required. For more on retention math, read Reducing Studio Churn.