Calculate Customer Acquisition Cost (CAC) across three modes: Basic (total spend ÷ customers), Channel Comparison (compare CAC by marketing channel), and Blended (add CLV for CLV:CAC ratio, payback period, and contribution per customer). Includes efficiency ratings and benchmark targets.
Enter your spend and customer data, then click Calculate CAC
CAC Calculator is part of the Business & Marketing collection. If you want a broader view of similar workflows, open the Business & Marketing category page or browse all QuickTools categories.
Common next steps after this tool include Break-Even Calculator, Profit Calculator and Revenue Calculator.
A Customer Acquisition Cost (CAC) calculator tells you exactly how much you spend to win each new customer. It is one of the most important unit economics metrics for any business — from e-commerce and SaaS to service companies — because it determines whether your marketing and sales investment is sustainable relative to the value each customer brings.
This tool offers three modes. Basic CAC divides your total marketing and sales spend by the number of new customers acquired in a given period, with normalization to a monthly and annualized view. Blended + CLV adds Customer Lifetime Value, gross margin %, and average monthly revenue to output your CLV:CAC ratio, payback period, and net contribution per customer — the full unit economics picture. Channel Compare breaks down CAC by individual marketing channel (Google Ads, Facebook, Email, SEO, etc.) so you can identify which channels acquire customers most efficiently and reallocate budget accordingly.
| Business | Mktg Spend | Sales Spend | New Customers | CAC | CLV | CLV:CAC |
|---|---|---|---|---|---|---|
| SaaS startup | $10,000 | $5,000 | 150 | $100 | $600 | 6.0× |
| E-commerce brand | $8,000 | $0 | 400 | $20 | $90 | 4.5× |
| B2B software | $30,000 | $20,000 | 25 | $2,000 | $8,000 | 4.0× |
| Mobile app | $5,000 | $0 | 2,000 | $2.50 | $12 | 4.8× |
| Local service biz | $1,500 | $500 | 30 | $67 | $350 | 5.2× |
| Online courses | $4,000 | $0 | 80 | $50 | $120 | 2.4× |
The fundamental formula for Customer Acquisition Cost is:
For example: You spend $8,000 on marketing and $2,000 on sales over 2 months and acquire 100 customers. CAC = ($8,000 + $2,000) / 100 = $100 per customer. Monthly CAC = $100 / 2 = $50. Annualised = $600.
The CLV:CAC ratio compares lifetime revenue against acquisition cost — the most important unit economics signal:
If CLV = $600, CAC = $100, and gross margin = 70%: CLV:CAC = 6×. Target CAC = $200. Payback = $100 / ($25 × 70%) ≈ 5.7 months. Contribution = ($600 × 70%) − $100 = $320 per customer.
In Channel Compare mode, CAC is calculated independently for each channel, then compared against the blended CAC to generate an efficiency rating. Channels with CAC ≤ 75% of blended CAC are rated Excellent; those at 75–100% are Good; 100–150% are Fair; above 150% are Poor.
CAC (Customer Acquisition Cost)
The total average cost to acquire one new paying customer, including all marketing and sales expenses. It is the baseline metric for evaluating marketing efficiency and pricing strategy.
(Marketing Spend + Sales Spend) / New CustomersBlended CAC
The average CAC across all marketing channels combined. Blended CAC smooths out channel-level variation and gives you the overall acquisition efficiency of your entire go-to-market motion.
Total Spend / Total New CustomersCLV:CAC Ratio
Customer Lifetime Value divided by CAC. The gold-standard unit economics metric. A ratio ≥ 3× means each customer generates at least $3 in lifetime value for every $1 spent acquiring them.
CLV / CACPayback Period
The number of months until a customer generates enough revenue (after margin) to recover their acquisition cost. Most SaaS companies target ≤ 12 months; e-commerce often targets ≤ 6 months.
CAC / (Monthly Revenue per Customer × Gross Margin %)Contribution per Customer
The net value delivered by each customer over their lifetime after deducting both the margin cost and the acquisition cost. Positive contribution means profitable acquisition; negative means each customer acquired is a net loss.
(CLV × Gross Margin %) − CACTarget CAC
The maximum CAC you should pay to achieve a CLV:CAC ratio of 3×. If CLV = $600, target CAC = $200. Exceeding this threshold without a path to higher CLV or lower costs risks unsustainable unit economics.
CLV / 3What is a good CAC?
There is no universal "good" CAC — it depends entirely on your Customer Lifetime Value. The benchmark is a CLV:CAC ratio of 3× or higher, meaning each customer generates $3 in lifetime value per $1 of acquisition cost. For SaaS, typical CAC ranges from $100 (SMB) to $10,000+ (enterprise). For e-commerce, $10–$100. What matters is whether your CLV comfortably exceeds your CAC with enough margin to cover overheads.
What costs should I include in CAC?
Fully-loaded CAC includes: all paid advertising spend (Google, Meta, LinkedIn, etc.), content creation and SEO costs, email and marketing tool subscriptions, marketing team salaries and agency fees, sales team salaries and commissions, CRM and sales tool subscriptions, and any referral or affiliate payments. Many businesses only include ad spend, which understates true CAC by 40–60%.
What is the difference between CAC and CPA (Cost per Acquisition)?
CPA (Cost per Acquisition) typically refers to the cost of a specific conversion action — which may be a lead, a trial sign-up, a download, or a sale — often calculated at the campaign or ad level. CAC specifically refers to the cost of acquiring a paying customer and usually includes all sales and marketing costs at a business level. CAC is the unit economics metric; CPA is the campaign performance metric.
What is a good CLV:CAC ratio?
3× is the widely accepted minimum. At 3×, for every $1 spent acquiring a customer, you generate $3 in lifetime value — enough to cover CAC and contribute meaningfully to profit after margin costs. A ratio below 1× means you spend more acquiring customers than they ever return (economically destructive). Above 5× often signals underinvestment — you could profitably acquire more customers.
How do I reduce my CAC?
Six proven levers: (1) Improve targeting to cut wasted spend on unqualified audiences. (2) Increase conversion rate through better landing pages, onboarding, and offers. (3) Invest in organic channels (SEO, content, community) which have near-zero marginal CAC. (4) Build a referral programme — referred customers typically have 16–25% lower CAC than paid. (5) Improve lead quality at the top of funnel so sales spends less time on non-buyers. (6) Shorten the sales cycle to reduce sales team cost per deal.
What is payback period and why does it matter?
Payback period is the number of months until a customer's cumulative revenue (after gross margin) recovers your CAC. For example, if CAC = $120 and a customer pays $50/month at 40% margin ($20 contribution), payback = 120 / 20 = 6 months. The shorter the payback, the less capital you need to fund growth. Most investors look for ≤ 12 months payback for SaaS companies. A long payback period (24+ months) can create a cash flow crisis during rapid growth.
Should I use blended CAC or channel-level CAC?
Both. Blended CAC gives you the headline unit economics number for business-level decisions. Channel-level CAC reveals which channels are efficient and which are destroying value. A common mistake is relying only on blended CAC — this can hide a poorly performing channel dragging down your best channels. Run channel comparison mode monthly to continually shift budget toward the lowest-CAC channels.
How do I calculate CAC without clear revenue attribution?
Use multi-touch attribution models such as: (1) First-touch — credit the channel that first brought the customer. (2) Last-touch — credit the final channel before conversion. (3) Linear — equal credit across all touchpoints. (4) Time-decay — more credit to recent touchpoints. For subscription businesses, compare cohort acquisition costs by source in your CRM. For e-commerce, UTM parameters + platform analytics (Google Analytics 4) enable channel-level attribution. Accept that any method has imperfections — consistency over time matters more than perfection.
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