What Is CAC?
CAC (customer acquisition cost) measures the total cost of acquiring one new customer, typically including ad spend, sales and marketing salaries, tools, and other costs directly tied to acquisition — not just the media spend alone. It's the core unit economics metric for judging whether a growth strategy is sustainable.
CAC is usually paired with customer lifetime value (LTV): a business can tolerate a high CAC if LTV is high enough to make each customer profitable well beyond the initial acquisition cost.
CAC Formula
Divide total acquisition spend by the number of new customers acquired.
CAC = Total Acquisition Spend ÷ New Customers
Worked Example
A company spends $15,000 on acquisition in a month and gains 150 new customers.
CAC = $15,000 ÷ 150 = $100
Rearranged, the formula solves for total spend or customer count instead, which is what the other two modes above do:
Total Acquisition Spend = CAC × New Customers
New Customers = Total Acquisition Spend ÷ CAC
What Affects CAC?
- Conversion rate at every funnel stage — CAC compounds across click, lead, and close rates, so small improvements at each stage add up.
- Channel mix — paid, organic, and referral channels all carry very different acquisition costs, and blending them changes overall CAC.
- Sales cycle length — longer sales cycles typically carry higher CAC due to the sales team time and nurturing involved.
- Market competitiveness — more competitors bidding for the same audience raises acquisition costs across every channel.
CAC Calculator FAQ
How is CAC calculated?
CAC is calculated by dividing total acquisition spend by the number of new customers acquired: CAC = Total Cost ÷ New Customers. Enter your spend and customer count above to calculate it instantly.
What's the difference between CAC and CPA?
They use the same formula, but CAC typically includes the fully loaded cost of acquiring a customer — ad spend, sales team cost, tools — while CPA usually refers just to the ad platform's cost per conversion. A narrower CPA is often one input into a broader CAC calculation.
What's a good CAC?
A good CAC is comfortably below customer lifetime value (LTV) — a common rule of thumb targets an LTV:CAC ratio of at least 3:1. Judge CAC against your own margins and LTV rather than a fixed dollar figure, since acceptable CAC varies enormously by business model.
How do you lower CAC?
Improve conversion rate throughout the funnel, increase organic and referral acquisition to blend down paid CAC, focus spend on channels and audiences with historically lower CAC, and raise retention so the same acquisition spend supports a larger active customer base.