Studio CAC Calculator: What You're Actually Paying to Acquire Each New Member

Studios that calculate CAC by channel discover their Facebook ad cost per member is 3–5x their referral cost per member. The channel reallocation that follows typically pays for itself in the first month — without acquiring a single additional member.

What Is Studio CAC and Why Does Channel-Level Matter?

CAC (Customer Acquisition Cost) is the average cost to acquire one paying member. At the aggregate level, it's a useful benchmark. At the channel level, it's a decision-making tool.

A studio spending $3,000/month across paid social, Google ads, and an informal referral program might see:

• Facebook ads: $1,500 spend → 8 new members → $187.50 CAC
• Google ads: $1,000 spend → 12 new members → $83.33 CAC
• Referrals: $100 in reward credits → 7 new members → $14.29 CAC
• Walk-in / organic: $400 in content time → 5 new members → $80 CAC

Aggregate CAC: $3,000 / 32 members = $93.75. The aggregate number says nothing. The channel breakdown says reallocate budget from Facebook to referral program and Google, and reduce CAC by 30–40% without reducing volume.

How Do You Build a Studio CAC Calculator?

You need three data points per channel per month:

1. Spend: All money and time-cost spent in the channel (ad spend + agency fees + content production cost)
2. New members attributed: Count of new paying members who reported that channel as their discovery source, or who can be traced to that channel via tracking links or referral codes
3. Period alignment: Spend and new member count must be from the same acquisition period — new members may book 2–4 weeks after first seeing an ad, so a 30-day window can undercount conversions from late-month spend

How Do You Calculate LTV to Compare Against CAC?

LTV (Lifetime Value) = average monthly spend × average tenure in months.

For a studio where average members spend $120/month and stay an average of 11 months: LTV = $120 × 11 = $1,320.

The maximum acceptable CAC at 3:1 LTV:CAC is $440.

If your blended CAC is $95 and LTV is $1,320, your LTV:CAC is 13.9:1 — meaning you're under-investing in acquisition relative to the value you generate. You could profitably increase acquisition spend significantly.

If your blended CAC is $400 and LTV is $1,000, your LTV:CAC is 2.5:1 — below the 3:1 threshold. You're spending too much to acquire clients relative to what they generate. Either reduce CAC (channel optimization) or increase LTV (better retention, higher pricing).

What Are the Common Attribution Mistakes?

Mistake 1: Counting everyone who signs up, not just new paying members. Free trial users, intro class completers who don't convert, and former members rejoining inflate your new member count and understate your real CAC.

Mistake 2: Using ad spend only, not total channel cost. A Facebook campaign managed by an agency costs ad spend + agency fees. An organic Instagram strategy costs staff time. Both must be counted to get accurate CAC.

Mistake 3: Single-period attribution. A member who saw your ad in March, attended a trial in April, and bought a pack in May is a Q1 spend / Q2 acquisition. Assign them to the period their first-paid-transaction occurred.

Mistake 4: Ignoring the retention differential. Two channels with equal CAC are not equal if one produces members who stay 8 months and the other produces members who stay 14 months. LTV:CAC by channel is the complete picture.

For a full acquisition framework, see the studio client acquisition playbook. The studio marketing attribution guide covers the attribution models in more detail. The member LTV calculator walks through LTV calculation step by step.

---

Sources:

• Harvard Business School: LTV:CAC ratio benchmarks for subscription businesses — ratio framework reference
• Google Analytics: Channel attribution documentation — attribution model technical reference