Most small business owners have a rough sense that their marketing is either working or not working. What they rarely have is a clear answer to why, or what to do about it.
The problem isn't that the data doesn't exist. It's that most businesses track the wrong numbers, or don't track anything at all, and end up spending money on channels they can't evaluate.
Four numbers change that. If you know these four numbers for your business, you know whether your marketing is working and where to put your next dollar.
Number 1: Cost Per Lead
Cost per lead is what you're spending to get one potential customer to raise their hand - fill out a form, call your phone, or walk through the door.
To calculate it: take your total marketing spend on a given channel in a period, and divide by the number of leads that came from that channel in the same period.
If you spent $1,500 on Google Ads last month and got 30 form submissions and calls, your cost per lead is $50.
This number is only meaningful when you compare it across channels. A $50 lead from Google Ads might be excellent. A $50 lead from a local magazine ad might be terrible. Context comes from tracking it consistently and knowing your close rate (next number).
The single most common mistake in local service business marketing: spending money on a channel without knowing the cost per lead. If you can't calculate this number for every channel you're spending on, you're flying blind.
Number 2: Close Rate
Close rate is the percentage of leads that turn into paying customers. If you get 30 leads in a month and 15 of them book, your close rate is 50%.
Close rate does two things. First, it tells you about the quality of your leads - a low close rate often means you're attracting the wrong prospects, not just that your sales process is weak. Second, it connects cost per lead to cost per customer acquired.
If your cost per lead is $50 and your close rate is 50%, your cost per acquired customer is $100. If your close rate is 25%, your cost per acquired customer is $200 - from the same lead cost.
This is why close rate matters for evaluating marketing channels, not just for improving your sales process. A channel with a higher cost per lead but better-qualified leads (higher close rate) might actually be cheaper on a per-customer basis than a cheaper lead source with a lower close rate.
Number 3: Customer Lifetime Value
Customer lifetime value (LTV) is the total revenue a typical customer brings you over the full course of your relationship with them.
For a business with repeat customers - HVAC maintenance contracts, dental practices, physiotherapy clinics, property managers - LTV can be several times the value of the first transaction. For one-time service businesses, LTV is closer to average job value.
Why it matters: your cost per acquired customer needs to be measured against LTV, not just the value of the first job. If your cost to acquire a customer is $200 but their average LTV is $800, that's a 4x return - a very different picture than if LTV is $300.
Most local service businesses underestimate their LTV because they don't track repeat business carefully. If you've never calculated what a typical customer is worth to you over time, the number is almost always higher than you expect.
Number 4: Channel Attribution
Channel attribution answers: where are your customers actually coming from?
This sounds straightforward. It isn't. Most small businesses have a rough sense ("most of my business is referrals") without a clear picture of which marketing efforts are contributing to what share of their leads and revenue.
At minimum, ask every new customer how they found you. Track the answers. After 90 days you'll have a real picture of your channel mix - and you'll almost certainly be surprised by something. Channels you assumed were working will be underperforming. Channels you weren't paying attention to will be driving more business than you realized.
If you're running paid advertising (Google Ads, Facebook, etc.), use UTM parameters and conversion tracking to connect ad spend to actual leads. If you're not, you're spending money on a channel you can't evaluate.
What to Cut and What to Scale
Once you have these four numbers by channel, the decision framework becomes straightforward:
Cut channels with high cost per acquired customer relative to LTV, or where you genuinely can't measure attribution.
Scale channels with low cost per acquired customer relative to LTV and consistent lead quality (reflected in close rate).
Fix first if close rate is low across all channels - the problem may be in your sales process or your offer, not your marketing.
The businesses that grow efficiently are almost always the ones that track these numbers and make decisions based on them. The ones that stagnate keep spending on channels they can't evaluate, cut things that were working because they seemed expensive, and never build a clear picture of what's actually driving revenue.
The Vanity Metrics to Stop Tracking
A few numbers that feel like progress but rarely connect to revenue:
Website traffic without conversion tracking. 10,000 visitors a month is irrelevant if you don't know how many of them become leads.
Social media followers and likes. For local service businesses, social engagement rarely correlates with leads unless you can draw a direct line from a post to a call or form.
Ad impressions. Impressions tell you how many times your ad was shown, not how many people took action. Clicks and conversions are what matter.
None of these are useless. They're just not the primary numbers. Cost per lead, close rate, LTV, and attribution are.