How to Measure Digital Marketing ROI: A Practical Guide
Stop guessing whether your marketing is working. The 4 numbers every Calgary business owner should know — and the one ratio that decides if you're actually growing or just busy.
- Most Calgary owners we audit don't actually know their CAC. They guess — usually 4x too low.
- Track CAC, CLV, conversion rate, ROAS — but only 2 numbers really matter: CAC vs. CLV.
- ROAS is a vanity metric unless you subtract fulfillment cost. Most don't.
- GA4 attribution improved meaningfully with Consent Mode v2 — re-check yours.
- If your CAC payback is under 12 months, scale spend. Over 18 months, fix the funnel before scaling.
We'll calculate your true CAC and CAC:LTV in 30 minutes. Most owners are surprised by the number.
"Half the money I spend on advertising is wasted; the trouble is I don't know which half." — John Wanamaker said that in 1875. In 2025, it's a solvable problem. The math is simple. Most owners just never sit down to do it.
Here's the system we use with our consulting clients — four numbers, one ratio, one weekly review. That's it.
Customer Acquisition Cost (CAC)
Total marketing spend (ads, agency fees, tools, your time × hourly cost) divided by new customers gained in the same period. The "your time" part is what most owners forget. If you spend 20 hours/week on marketing and bring in 5 new customers, that time is part of CAC.
If you can't tell me your CAC, you don't have a marketing strategy. You have a marketing budget.
— Shuhai Marketing
Customer Lifetime Value (CLV)
Average revenue per customer × gross margin × retention period. For Calgary service businesses, retention is the lever most owners under-invest in. A 10% lift in retention typically beats a 30% lift in lead gen for net profit.
Conversion Rate
Track conversion rates at every funnel stage: visitor → lead → qualified lead → customer. The bottleneck is rarely where you think. We see Calgary businesses obsess over Google Ads CTR while their lead-to-customer rate sits at 8%. Fix the bottleneck — usually it's on the site itself, which is why conversion-focused web design beats a fancier ad in most cases. See how site design influences this.
Return on Ad Spend (ROAS) — and Why It Lies
ROAS = revenue from ads ÷ ad spend. Looks great when it's 4x, until you remember you only keep 30% of that revenue after fulfillment. The fix: track net ROAS — revenue minus cost of goods. Suddenly that 4x is 1.2x and you're running ads for the privilege of working. This is one of the first things we fix inside our SEM & SEO engagements.
The Only Ratio That Matters: CAC:LTV
A healthy CAC:LTV ratio is 1:3 or better — i.e., a customer is worth at least 3x what they cost to acquire. Below 1:2, you're subsidizing growth with cash. Above 1:5, you're probably under-investing and a competitor is about to eat your lunch.
In our last 12 Calgary service-business audits, the average gap between owner-estimated CAC and actual CAC was 4.2x. The reason: nobody includes their own labour, agency overhead, or unbillable lead-qualification time. Once you include those, the picture changes — usually for the better, because it forces real decisions.
We'll calculate your true CAC, CLV, and CAC:LTV ratio in a 60-minute working session. Walk away with one number that actually matters.
- CAC by channel — which channels are subsidizing which?
- LTV by customer segment — which segments are worth doubling down on?
- Conversion rate at each funnel stage — where's the actual bottleneck?
- Net ROAS (after COGS) — not gross ROAS
- Compare to last month and same month last year
Once you have these numbers, decisions stop being arguments. Combine the CAC:LTV view with strong organic acquisition and disciplined content and you have a flywheel that compounds without burning cash.
Send us your last 12 months of revenue + ad spend — we'll come back with your true CAC:LTV and the three highest-leverage levers.
Calgary, AB · Free 30-min consult
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