This calculator measures customer acquisition cost (CAC) — a marketing and business metric. If you're looking for a coronary artery calcium (CAC) score calculator or medical CAC calculator, this is not the right tool. This page is for business owners, marketers, and founders calculating what it costs to acquire a paying customer.
What is customer acquisition cost (CAC)?
CAC is the total cost of winning one new customer. It's the denominator behind almost every growth decision, because if you don't know what a customer costs, you can't tell whether acquiring them is profitable.
CAC formula: CAC = Total sales & marketing cost ÷ New customers acquired
If you spent $30,000 on sales and marketing last quarter and gained 150 customers, your CAC is $30,000 ÷ 150 = $200.
CAC calculator Excel — how to build your own
If you prefer tracking in a spreadsheet, the formula works the same in Excel or Google Sheets:
CAC = B2 / B3
where B2 = total sales & marketing cost, B3 = new customers acquired
Set up columns for each month or quarter, with spend and customer count in separate rows, then apply the division formula across. To model different scenarios, create a row for "target CAC" and back-calculate: required spend = target CAC × desired new customers.
How to calculate CAC (step by step)
- Pick a time period — usually a month or quarter. Use the same window for costs and customer count.
- Add all sales & marketing spend in that period (see checklist below).
- Count new customers only — first-time paying customers, not repeat orders from existing accounts.
- Divide: total cost ÷ new customers = CAC.
Worked example: B2B SaaS (quarterly)
| Cost category | Q1 spend |
|---|---|
| Paid ads (Google + LinkedIn) | $18,000 |
| Marketing salaries (allocated %) | $9,000 |
| CRM, email, analytics tools | $1,200 |
| Agency / creative | $1,800 |
| Total S&M cost | $30,000 |
New paying customers in Q1: 150 → CAC = $30,000 ÷ 150 = $200.
Check sustainability: if customer lifetime value is $800, LTV:CAC = 4:1 — healthy for many SaaS businesses. If LTV is only $250, the same CAC destroys margin.
Worked example: ecommerce (monthly, ads-only vs fully loaded)
A DTC brand spends $12,000 on Meta and Google in March and acquires 200 new customers:
- Paid-media CAC = $12,000 ÷ 200 = $60 (what the ad dashboards imply)
- Fully loaded CAC might be $85–$110 once you add email platform, part-time marketer, and creative — the number investors and finance teams care about
Always label which CAC you are quoting. Comparing your $60 ad CAC to a competitor's "fully loaded" $90 CAC is misleading.
The customer acquisition cost model
A CAC model breaks down the components that drive your acquisition cost so you can identify which lever to pull. The basic structure:
CAC = (Ad Spend + Salaries + Tools + Agency + Creative + Events) ÷ New Customers
Each component can be split further — for example, ad spend by channel (Google vs Meta vs LinkedIn), or salaries by role (performance marketer vs content vs SDR). A good CAC model shows you which channel has the lowest blended cost, not just the lowest ad-reported CPA. Most ad platforms only report their own cost per conversion; a full CAC model folds in the human and tool costs those dashboards leave out.
CAC payback period — when do you get your money back?
CAC alone doesn't tell you about cash flow timing. If a customer costs $200 and generates $50/month in gross profit, the CAC payback period is 4 months. Shorter payback means you can reinvest faster; long payback strains cash flow even if LTV:CAC looks healthy on paper. Use our CAC payback calculator to model the full timeline.
What to include in "cost"
A fully-loaded CAC counts more than ad spend:
| Include | Often forgotten |
|---|---|
| Ad spend (Google, Meta, Amazon, etc.) | Prorated marketing & sales salaries |
| Agency and freelancer fees | CRM, email, analytics, design tools |
| Creative production | Sales commissions tied to new logos |
| Events and sponsorships (if acquisition-focused) | Content and SEO contractor costs |
Many businesses understate CAC by only counting media spend — which makes campaigns look more profitable than they really are. When in doubt, over-include costs for a conservative number.
What is a good customer acquisition cost?
There is no universal number for a "good" CAC — it depends entirely on what a customer is worth. The standard health check is the LTV:CAC ratio:
Good vs bad LTV:CAC
A $200 CAC is excellent if each customer is worth $900 over their lifetime, and disastrous if they're worth $150. That's why CAC is almost always read alongside lifetime value as the LTV:CAC ratio — the single clearest test of whether your growth engine is sustainable.
Rough health checks (SaaS-heavy benchmarks; ecommerce varies by margin):
- Below 1:1 — you lose money on every new customer
- 1:1 to 2:1 — fragile; only works with very fast payback
- 3:1 or better — commonly cited as healthy for subscription businesses
- Above 5:1 — strong, but can also mean you are under-investing in growth
Use the CAC payback calculator to see how many months of gross profit it takes to earn back acquisition cost, and the customer lifetime value calculator to estimate what a customer is really worth.
How to lower CAC
CAC falls when you either spend less for the same customers or win more customers for the same spend:
- Improve ad targeting and creative to cut wasted CPM/CPC
- Raise landing-page conversion rate and lead-to-customer rate
- Increase AOV so each acquired customer carries more first-order revenue
- Invest in retention and referrals so organic customers dilute blended CAC over time
Tie CAC back to your marketing budget — if CAC rises, the same budget buys fewer customers unless you increase spend or efficiency.
CAC vs CPL vs CPA
- CPL — cost per lead (top of funnel)
- CPA — cost per conversion action (often platform-reported)
- CAC — cost per paying customer, usually fully loaded
Quick bridge: implied CAC ≈ CPL ÷ lead-to-customer rate. Example: $40 CPL at a 20% close rate → about $200 CAC. Read CAC vs CPL for a full side-by-side.