The Formula That Tells You Whether Your Marketing Is Actually Working

I ask every owner: what's your customer lifetime value?

About 20% know the answer. The other 80% give me their average job value - which is a completely different number.

LTV is not what a customer pays for one job. It's what they pay over the entire relationship: first job, repeat services, referrals they send, reviews they leave. For a well-run home service business, LTV is typically 2.8 - 4.5x the average single job value. Most owners are calculating it wrong and, as a result, making marketing investment decisions with the wrong math.

Once we recalculate the real LTV, the marketing conversation changes completely.

Why "Did We Get Busier?" Is the Wrong Question

The question most owners use to evaluate marketing: did we get busier after the campaign? Did the phone ring more? Is revenue up?

These are lagging indicators. They tell you what happened, not whether your marketing is profitable. A business can get busier and still be burning money on acquisition. And a business can run quiet months and still have excellent marketing economics if the customers it acquires have high lifetime value.

The right question: Is the cost of acquiring a customer less than the value that customer generates over their relationship with your business?

This is the CAC:LTV ratio. And it's the only number that tells you whether your marketing is actually working.

Calculating Your CAC (Cost per Acquired Customer)

CAC = Total Marketing Spend ÷ New Customers Acquired

Let me be specific about what goes into "total marketing spend": - Google Ads spend - Facebook/Instagram Ads spend - LSA (Local Services Ads) budget - SEO retainer or content costs - Direct mail spend - Sponsorships, trade shows, networking memberships - Lead generation platform fees (Angi, Thumbtack, HomeAdvisor) - Marketing agency fees

What most owners miss: the staff time spent on marketing activities. If the owner spends 5 hours per week on marketing strategy, content, and vendor management at an effective hourly rate of $150, that's $750 per week, or $39,000 per year. This should be included in marketing spend for CAC calculations.

Example:

A Charlotte electrical contractor spending: - Google Ads: $4,200/month → $50,400/year - LSA: $1,800/month → $21,600/year - Marketing agency: $2,500/month → $30,000/year - Owner marketing time (4 hrs/week × $150): $31,200/year

Total marketing spend: $133,200/year

New customers acquired in the last 12 months: 280 (these are first-time customers, not repeat bookings)

CAC = $133,200 ÷ 280 = $476

Every new customer cost this business $476 to acquire. Is that good or bad? You can't answer that without the LTV.

Calculating Your LTV (Customer Lifetime Value)

LTV has three components:

Component 1: Average revenue per customer relationship. Not the first job - the expected total revenue from a customer over the typical relationship length (usually 2 - 5 years for home services).

To calculate: Average job value × Average jobs per customer per year × Average customer retention years

For the Charlotte electrician: - Average job value: $680 - Jobs per customer per year: 1.3 (some customers call once, some call multiple times) - Average retention: 3.2 years (typical for electrical - not emergency-driven, so retention is moderate)

Revenue per customer relationship = $680 × 1.3 × 3.2 = $2,828

Component 2: Referral value. How many of your customers refer someone? Multiply that by the LTV of the referred customer.

For this business: 28% of customers refer at least one person. The referred customer has an LTV of $2,828 (same calculation). So each customer, on average, generates 0.28 × $2,828 = $792 in referral value.

Note: Referred customers often have a slightly higher referral rate themselves (30%+), which means the chain extends further. For this calculation, I'm using one generation of referrals to keep it conservative.

Component 3: Review value. As calculated in the previous post in this series, reviews have measurable economic value through local search ranking effects. For simplicity, I'll use a conservative $400 per customer as the amortized review value over the customer relationship.

Total LTV = $2,828 (direct) + $792 (referral) + $400 (review) = $4,020

The CAC:LTV Ratio

CAC: $476
LTV: $4,020

CAC:LTV ratio = 1:8.4

For every $1 spent acquiring a customer, the business generates $8.40 in lifetime value.

How does this rate? Marketing economists typically define: - Below 1:3: Unsustainable. You're spending more than you're generating. - 1:3 to 1:5: Marginal. You're covering acquisition cost but leaving little margin for operations and growth. - 1:5 to 1:10: Healthy. Marketing is profitable. Growth is investable. - Above 1:10: Excellent. You can grow aggressively.

At 1:8.4, the Charlotte electrician is in healthy territory. Which means the right question isn't "should we cut marketing spend?" - it's "what's our capacity to convert more of the leads we're generating?"

Because here's the leverage point: every 10-point improvement in conversion rate increases the effective LTV return on every marketing dollar spent. If the business improves conversion rate from 38% to 48%, they're not spending more on marketing - they're getting more value out of the leads they already paid to generate.

When the CAC:LTV Ratio Signals a Problem

Let me show a different business where the ratio reveals a real problem.

A Dallas landscaping company: - Marketing spend: $8,500/month → $102,000/year - New customers acquired: 190 - CAC = $537 - Average job value: $340 (lawn maintenance) - Jobs per customer per year: 18 (recurring monthly + one-time projects) - Retention: 2.1 years (landscaping has higher churn than most services) - Revenue per relationship: $340 × 18 × 2.1 = $12,852... but wait. This is recurring service revenue, not one-time. Let me adjust: monthly recurring at $185/month × 25 months = $4,625. Plus occasional additional projects: 3 × $420 = $1,260. Total direct revenue: $5,885. - Referral value: 22% referral rate × $5,885 = $1,295 - Review value: $400

Total LTV = $5,885 + $1,295 + $400 = $7,580

CAC:LTV = $537:$7,580 = 1:14.1

That looks excellent. But here's the problem this business had: their actual retention was 2.1 years, not the industry-typical 3 - 4 years. They were losing customers faster than average. That churn was suppressing LTV significantly - if they could move retention from 2.1 to 3.0 years, their LTV would jump from $7,580 to nearly $11,000, and their ratio would move to 1:20.5.

The marketing wasn't the problem. The retention was.

This is the insight the CAC:LTV ratio surfaces. Not "should we spend more or less on ads?" but "where in the customer lifecycle is the value being lost?"

The Three Zones and What To Do in Each

If your ratio is below 1:3: Stop increasing marketing spend immediately. Fix intake and conversion first. Marketing more aggressively to a broken intake system is accelerating the burn rate, not solving the problem. The priority is CAC reduction - either by improving conversion rate (same leads, more customers) or by shifting to lower-cost channels.

If your ratio is 1:3 to 1:5: Diagnose the bottleneck. Is LTV low because of poor retention? Is CAC high because of poor conversion rate or expensive channels? Run the component calculations to find the specific lever.

If your ratio is above 1:5: You have a profitable marketing operation. The question is: what's the ceiling on growth? At 1:8+, the ROI case for increasing marketing spend is strong - as long as operational capacity can handle the volume. If conversion rate is below 50%, improving intake is more leveraged than increasing ad spend.

The Conversion Rate Connection