TL;DR
Customer Acquisition Cost and Lifetime Value are the two metrics that tell you whether your business model is sustainable. If LTV is not at least 3x your CAC, something needs to change.
Every business owner knows their revenue. Most know their expenses. Very few know their Customer Acquisition Cost (CAC) or Customer Lifetime Value (LTV). These two numbers tell you whether your business model actually works.
If it costs you $500 to acquire a customer who generates $400 in total revenue, you are losing money on every sale. No amount of volume fixes that math. Here is how to calculate both and what the ratio should look like.
Customer Acquisition Cost (CAC)
Formula: CAC = Total Sales and Marketing Expenses / Number of New Customers Acquired
Include everything you spend to acquire customers during a specific period: paid advertising (Google, Facebook, TikTok), sales and marketing salaries or commissions, agencies or freelancers, content creation, branding, CRM and email platform costs. Divide by the number of new paying customers acquired during that same period.
Example: You spend $6,000 in a quarter on marketing. You acquire 30 new customers. Your CAC is $200. Each new customer costs you $200 to acquire.
Break it down by channel for sharper insights. If Facebook ads cost $2,000 and brought 12 customers (CAC: $167) while Google ads cost $1,500 and brought 8 customers (CAC: $188), Facebook is more efficient for you. This tells you where to allocate budget.
Benchmarks by business type: eCommerce B2C typically targets $20 to $100. B2C services run $100 to $500. B2B SaaS is $200 to $1,500 or more. B2B consulting ranges from $300 to $3,000 or higher, depending on deal size. Your CAC is only meaningful when compared to what those customers are worth.
Lifetime Value (LTV)
For service and product businesses: LTV = Average Purchase Value x Purchase Frequency x Customer Lifespan
For subscription businesses: LTV = Average Revenue Per User (ARPU) / Churn Rate
Example: You run a consulting firm. Average invoice is $500. Clients buy twice per year. Average client relationship lasts 3 years. LTV = $500 x 2 x 3 = $3,000. Each client is expected to generate $3,000 over the course of the relationship.
For a SaaS business charging $100/month with 5% monthly churn: LTV = $100 / 0.05 = $2,000.
Typical LTV ranges: eCommerce $100 to $500. Service businesses $1,000 to $10,000 or more. B2B SaaS (small business) $1,200 to $15,000 or more. The range is wide because LTV depends heavily on retention, pricing, and how often customers buy.
The Ratio That Matters: LTV to CAC
LTV by itself does not tell you if your business is healthy. You need to compare it to what you spent to acquire the customer.
The target: LTV:CAC of 3:1 or higher. For every $1 you spend acquiring a customer, you should generate at least $3 in lifetime revenue.
Below 2:1 means you are likely overspending on acquisition or underpricing your product. Your business model needs adjustment.
Between 3:1 and 5:1 is the healthy range. Sustainable growth with good unit economics.
Above 5:1 could mean you are profitable but underinvesting in growth. You could spend more on marketing and still generate strong returns. If your competitors figure this out before you do, they will outgrow you.
Also track your CAC payback period: how many months until a new customer's revenue covers the cost of acquiring them. Ideal is 3 to 6 months for B2C. Up to 12 months is acceptable for high-margin B2B. Beyond 12 months, you are tying up too much capital in acquisition.
How to Improve Both Numbers
To reduce CAC: Optimize your website and landing pages for conversion. A 1% improvement in conversion rate reduces CAC across all channels. Invest in organic content (SEO, social, referrals) that compounds over time. Organic channels have near-zero marginal CAC once the content exists. Cut underperforming ad channels. Shift budget to what works.
To increase LTV: Strengthen retention. It is 5x to 7x cheaper to keep an existing customer than to acquire a new one. Upsell and cross-sell: premium packages, add-on services, complementary products. Increase purchase frequency with regular touchpoints, loyalty programs, or subscription models. Raise prices if your product delivers more value than you charge for.
Putting It Together
Calculate your CAC and LTV this week. If you use QuickBooks, you already have the expense data. Pull your sales and marketing spend for the last quarter, count your new customers, and do the division. For LTV, look at your average invoice, how often clients buy, and how long they stay.
Why Most Businesses Never Calculate These
Most small businesses track revenue and expenses. Almost none track CAC and LTV. The reason is simple: these metrics require you to connect your marketing spend to specific customer outcomes, and most businesses do not have that tracking in place.
Start small. Pick one marketing channel. Track how much you spent on it last quarter. Count how many new paying customers came from that channel. Divide. That is your channel-specific CAC. Then look at those same customers and estimate how long they will stay and how much they will spend. That is your LTV estimate.
You do not need perfect data. You need directional data. Even a rough LTV:CAC ratio tells you whether your acquisition strategy is sustainable or whether you are burning cash to buy customers who will never pay back the investment.
If your LTV:CAC ratio is below 3:1, something needs to change: your pricing, your retention, or your acquisition spend. If you want help diagnosing which lever to pull, book a call.
Next step: run your numbers through the free CFO scorecard.
Frequently Asked Questions
- What is CAC and why does it matter?
- CAC is Customer Acquisition Cost, calculated as total sales and marketing expenses divided by the number of new customers acquired in that period. If it costs you $500 to acquire a customer who generates $400 in total revenue, you're losing money on every sale, and no amount of volume fixes that math.
- How do I calculate my CAC?
- Add up everything you spend to acquire customers in a period, paid advertising, sales and marketing salaries or commissions, agencies or freelancers, content creation, branding, and CRM or email platform costs, then divide by the number of new paying customers acquired in that same period. Spending $6,000 in a quarter to acquire 30 new customers, for example, gives you a CAC of $200.
- What's a good CAC benchmark for my industry?
- It depends on your business type. eCommerce B2C typically targets $20 to $100, B2C services run $100 to $500, B2B SaaS is $200 to $1,500 or more, and B2B consulting ranges from $300 to $3,000 or higher.
Get weekly CFO insights
No fluff. Real finance strategy for Canadian business owners. Unsubscribe any time.
Related Articles
Is Your Gross Margin Real? How Misclassified Costs Inflate Profit
Gross margin only means something if the right costs are in the right buckets. Misclassified costs inflate the number, distort your pricing, and can hide a structural problem until it is too late.
4 min read
Corporate Tax Installments: When CRA Expects You to Pay Throughout the Year
If your corporation owes more than $3,000 in tax in a given year, CRA may require monthly installment payments throughout the following year. Missing them triggers interest even if you pay the full balance on time at year-end.
6 min read
How to Tell What Counts as Profit When Payroll and Bills Hit on Staggered Dates
A healthy bank balance mid-month doesn't mean you made money. When expenses hit on staggered dates, the balance swings constantly. Here's how to separate actual profit from temporary cash on hand.
5 min readNeed financial strategy for your business? Explore our CFO services or book a call.