Customer Acquisition Cost (CAC) Calculator vs Customer Lifetime Value (CLV) guide Guide: The Startup Metric Every Founder Must Understand
CAC (Customer Acquisition Cost) and LTV (Lifetime Value) are the two numbers that determine whether your business's growth engine is economically viable. If LTV:CAC is below 3:1 and payback exceeds 18 months, you have a unit economics problem — regardless of top-line growth.
Calculating CAC Correctly: What to Include
CAC calculation is frequently done wrong, which produces a misleadingly low number that makes unit economics look better than they are. The correct formula includes ALL sales and marketing costs — not just ad spend. Full CAC Formula: CAC = (Total Sales & Marketing Spend) ÷ (New Customers Acquired) Sales & Marketing spend includes: • Paid advertisin
Calculating LTV: The Correct Method
LTV (Lifetime Value, same as CLV) is the total gross profit a business expects from a customer over the entire relationship. Like CAC, the correct LTV calculation includes specific details that are frequently omitted, making LTV appear higher than reality. For SaaS and subscription and CLV guide businesses: LTV = (Average Monthly Revenue per Accoun
The LTV:CAC Ratio: What It Means and What It Doesn't
The LTV:CAC ratio is the most widely cited unit economics metric in SaaS and venture capital. Here's what each ratio level signals: LTV:CAC 5:1: Potentially underinvesting in growth. If unit economics are this strong, the business could profitably increase acquisition spending — returning more than $5 for every additional dollar spent on growth. So
CAC Payback Period: The Cash Flow Dimension
LTV:CAC tells you the magnitude of value creation. Payback period tells you how quickly you recover the acquisition investment — the cash flow dimension that ratio analysis ignores. CAC Payback Period = CAC ÷ Monthly Gross Profit per Customer Monthly Gross Profit per Customer = Monthly Revenue per Customer × Gross Margin % Example: CAC: $2,400 Mont
Frequently Asked Questions
What is CAC in business?
Customer Acquisition Cost (CAC) is the total cost of winning a new customer, including all sales and marketing expenses. Formula: CAC = Total Sales & Marketing Spend ÷ New Customers Acquired (in the same period). For a company spending $180,000/month on sales and marketing and ac
What is a good LTV:CAC ratio?
3:1 is the widely cited benchmark for healthy unit economics in SaaS and subscription businesses — each customer generates 3× their acquisition cost in lifetime gross profit. Below 1:1 is fundamentally unsustainable. 3:1 to 5:1 is strong and scalable. Above 5:1 may indicate under
How do you calculate customer acquisition cost?
CAC = All Sales & Marketing Costs ÷ New Customers Acquired. Sales & marketing costs include: paid advertising, sales team full compensation (salary + benefits + payroll taxes), marketing team compensation, sales/marketing tools and software, agency fees, events, and content produ
What is the CAC payback period?
CAC payback period is the number of months required to recover the acquisition cost from a customer's gross profit. Formula: CAC Payback = CAC ÷ (Monthly Revenue per Customer × Gross Margin %). A $2,000 CAC with $180/month ARPA at 75% gross margin: payback = $2,000 ÷ $135 = 14.8
How do LTV and CAC relate to each other?
LTV and CAC define the unit economics of customer acquisition. LTV:CAC ratio = how many dollars of lifetime value are generated per dollar of acquisition cost. A 3:1 ratio means $3 in lifetime gross profit per $1 in CAC. This ratio determines whether growth is value-creating (rat
Why is LTV:CAC important for startups?
LTV:CAC is important for startups because it determines whether growth creates or destroys value. A startup growing 200%/year with a 0.8:1 LTV:CAC is burning more cash than it can recover — growth accelerates losses. A startup growing 80%/year with a 4:1 ratio is compounding valu