Customer Acquisition Cost Calculator
Calculate your Customer Acquisition Cost, LTV:CAC ratio, and payback period. Know instantly whether your acquisition economics are healthy.
CAC calculator inputs and results
Inputs
Acquisition Spend
Customer Value
$2,000.00
Total spend: $80,000
$7,000.00
24-month lifetime
3.50:1
Benchmark: 3:1 or higher
0.6 months
Months to recover CAC
Unit Economics: Healthy
Good ratio. Industry benchmark is 3:1. You're on track.
Improve Your CAC with HelloGrowthCRM
HelloGrowthCRM's AI lead scoring focuses your sales team on the highest-value prospects, reducing wasted spend and lowering CAC. Automated follow-ups shorten your sales cycle, and built-in attribution shows exactly which channels drive the best LTV:CAC ratios.
Understanding Your CAC Calculation
What it does
Calculates your Customer Acquisition Cost (CAC), Customer Lifetime Value (LTV), LTV:CAC ratio, and payback period from your sales and marketing spend inputs. Results update instantly as you adjust inputs, so you can model different scenarios.
Why it matters
CAC is one of the most important unit economics metrics for any B2B business. A healthy LTV:CAC ratio of 3:1 or higher signals that your acquisition model is sustainable and scalable. Most B2B SaaS companies that scale efficiently maintain a payback period under 12 months — meaning they recover the cost of acquiring each customer within the first year of that customer's contract.
Definition
CAC = (Total Marketing Spend + Total Sales Spend) / New Customers Acquired in the period. LTV = Average Contract Value × (Customer Lifetime in Months / 12) × Gross Margin %. LTV:CAC Ratio = LTV / CAC. Payback Period = CAC / (Monthly Revenue per Customer × Gross Margin %).
Assumptions
- All spend and customer acquisition figures are from the same time period (e.g. same quarter or fiscal year).
- Average Contract Value (ACV) is the annualised value — not monthly recurring revenue.
- Gross margin excludes customer success and support costs unless those directly prevent churn.
- Customer lifetime is the average months a customer stays before churning or not renewing.
How to interpret your results
A ratio below 1:1 means you are spending more to acquire customers than they will ever return in profit — this is unsustainable. Between 1:1 and 3:1 is below the industry benchmark and indicates your acquisition costs need to come down or your LTV needs to increase. A 3:1 to 5:1 ratio is the healthy zone for most B2B SaaS businesses. Above 5:1 may indicate under-investment in growth — you may be leaving revenue on the table by not spending more on acquisition.
How to improve
Reduce CAC with AI lead scoring
AI lead scoring focuses your sales team on prospects with the highest probability of converting, eliminating time spent on low-quality leads. Fewer low-quality demos means lower sales cost per customer acquired.
Increase LTV through better onboarding
The fastest way to improve LTV is to reduce early churn. Systematic onboarding that ensures customers see value in the first 30 days dramatically increases average customer lifetime.
Shorten payback period with automation
Automated follow-up sequences, AI email drafting, and workflow automation reduce the sales cycle length. A shorter cycle means reps handle more deals with the same headcount, reducing cost per deal closed.
CAC Calculator — frequently asked questions
Quick answer
What is Customer Acquisition Cost (CAC)?
- What is a good LTV:CAC ratio
- How do you calculate CAC payback period
- What costs should be included in CAC