CPL, ROAS, cost per member: the 5 numbers to track for your ads
CPL, conversion rate, ROAS, cost per member, frequency: the 5 metrics that truly matter to steer your gym’s advertising, explained simply.
Open Meta's ads manager and you'll feel buried: dozens of columns, acronyms, percentages everywhere. The truth is that five numbers are enough to know whether your ads are paying off. Here they are, what they mean, and how to read them without being an analyst.
1. Cost per lead (CPL)
CPL = budget spent ÷ number of leads generated
Your CPL tells you how much each contact costs you (a form, a message, a call). It's handy for comparing two campaigns: at equal offer, an ad with a 5 € CPL pulls in more contacts than one at 15 €.
You can generate very cheap leads who never sign up. CPL measures volume, not quality. Always read it alongside the next number.
2. The lead-to-member conversion rate
Conversion rate = (number of members ÷ number of leads) × 100
This is the missing link between "having contacts" and "having customers." Turn 50 leads into 10 members and that's a 20 % conversion rate.
This number depends as much on your gym (how fast you call back, the quality of your welcome, how strong your offer is) as on the ad itself. It's often your most profitable lever: moving from 20 % to 30 % conversion cuts your cost per member by a third, without spending a single extra euro.
3. Cost per member
Cost per member = budget spent ÷ number of new members
Here's the real verdict. Not clicks, not leads: how much a paying member actually costs you. To judge whether it's good, compare it to a member's lifetime value (their monthly subscription multiplied by how many months they stay). We break this calculation down in our guide on the cost of acquiring a member.
4. ROAS, or return on ad spend
ROAS = revenue generated by the ads ÷ ad budget
ROAS sums everything up in a single number. A ROAS of 4 means every euro of ad spend brought back 4 € in revenue.
800 € in ads, 10 new members, a lifetime value of 468 € each.
- Revenue generated: 10 × 468 = 4,680 €
- ROAS: 4,680 ÷ 800 = 5.85
Every euro invested brought back nearly six. Always calculate ROAS on lifetime value, not on the first month, otherwise you'll badly underestimate your profitability.
5. Frequency
Frequency = the average number of times a single person has seen your ad
This metric warns you about a silent problem: creative fatigue. When frequency climbs past 3 or 4 over a short period, the same people are seeing your ad on a loop. Clicks drop, cost per member rises. That's your signal to swap the visual.
The secret: read them together
Taken on their own, each number lies. It's reading them in combination that reveals the truth:
- Low CPL but high cost per member: your leads are poor quality, or your conversion is letting you down.
- Good cost per member but climbing frequency: make the most of it now, the ad is about to run out of steam.
- High ROAS: don't touch a thing, and even consider raising the budget.
Calculating these five numbers by hand, every week, campaign by campaign, while chasing down who actually signed at the gym: nobody does it, it's just too tedious. AdCoach works them out automatically and turns them into clear decisions, so you keep the controls without the analyst's workload.
- CPL: a volume of contacts, to be read with quality in mind.
- Conversion rate: the cheapest lever for gaining profitability.
- Cost per member: the real verdict, to be compared with lifetime value.
- ROAS: profitability summed up in one number.
- Frequency: your fatigue alert, the signal to refresh your visuals.
Five numbers, not thirty columns. Master those and you'll finally know whether your ads are truly filling your gym.
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