What is a good Customer Acquisition Cost (CAC)?

There is no universal 'good' CAC — it must be evaluated relative to customer lifetime value. As a benchmark, most investors and operators target an LTV:CAC ratio of at least 3:1. A $500 CAC is excellent for a customer worth $5,000 but catastrophic for a customer worth $600. Always anchor CAC benchmarking to LTV and payback period, not absolute dollars.

How do you calculate CAC payback period?

CAC Payback Period (months) equals CAC divided by Monthly ARPU (Average Revenue Per User). For example, if it costs $1,000 to acquire a customer who pays $120 per month, the payback period is 1,000 ÷ 120 = 8.3 months. Companies should target under 12 months for capital efficiency; periods above 18 months typically require significant outside funding to scale.

What costs should be included in CAC?

CAC should include all fully loaded sales and marketing costs: advertising spend, marketing team salaries and benefits, sales rep salaries and commissions, CRM and marketing automation software, agency and consultant fees, event and conference costs, and any content production directly tied to acquisition. Many companies undercount CAC by omitting salaries and tool subscriptions.

What is the difference between blended CAC and new customer CAC?

New customer CAC counts only net-new logo acquisitions in the denominator, giving a true cost per new customer. Blended CAC includes all customers — new and returning/expansion — which can make the metric look more favorable than reality. Investors typically scrutinize new customer CAC to evaluate whether the go-to-market engine is healthy.

How can I reduce Customer Acquisition Cost?

The most effective CAC reduction levers are: improving conversion rates at each funnel stage (more customers per dollar spent), investing in inbound and organic channels (SEO, content, community) that have near-zero marginal CAC, increasing sales rep productivity through better tooling and targeting, and expanding customer referral programs, which typically produce the lowest-CAC customers of any channel.

Customer Acquisition Cost (CAC) & Payback Period Calculator for 2026

Calculate your Customer Acquisition Cost (CAC), payback period, and blended efficiency ratios to optimize sales and marketing spend.

Sales Spend ($)

Marketing Spend ($)

New Customers Acquired

Monthly ARPU ($)

Monthly Churn Rate (%)

Display Currency

CAC & Payback Period Calculator

Enter your sales and marketing spend, new customers acquired, and ARPU to calculate CAC and payback period.

Mathematical Audit

How CAC & Payback Period Are Calculated

CAC measures the average cost to acquire one paying customer. Payback period shows how many months of revenue are needed to recover that cost.

CAC = (Sales Spend + Marketing Spend) ÷ New Customers Acquired

CAC Payback Period (months) = CAC ÷ Monthly ARPU

LTV:CAC Ratio = Customer LTV ÷ CAC

Customer LTV = Monthly ARPU ÷ Monthly Churn Rate (decimal)

Blended CAC = Total S&M Spend ÷ (New Customers + Expansion Customers)

Include all fully loaded sales and marketing costs: salaries, software, agencies, events, and paid media. The payback period assumes constant ARPU and does not account for expansion revenue, which can shorten actual payback.

Operational Guide

How to Use the CAC & Payback Period Calculator

Enter Sales Spend

All sales-related costs for the period: rep salaries, commissions, CRM tools, and demo infrastructure.

Enter Marketing Spend

All marketing costs: paid ads, content, SEO tools, events, and marketing team salaries.

Enter New Customers Acquired

The number of net new paying customers won during the same period as your S&M spend.

Enter Monthly ARPU

Average monthly revenue per customer. Divide your MRR by total customer count if you don't have this directly.

Set Monthly Churn Rate

Monthly customer churn percentage — used to derive LTV and the LTV:CAC ratio.

Real-World Scenario Example

"A SaaS company spends $25,000 on sales and $15,000 on marketing in a month, acquires 40 new customers at $120 ARPU and 2% monthly churn."

Inputs

salesSpend:25000

marketingSpend:15000

newCustomers:40

monthlyArpu:120

monthlyChurnRate:2

Result

CAC = $1,000, Payback Period = 8.3 months, Customer LTV = $6,000, LTV:CAC Ratio = 6:1. Excellent unit economics.

Important Disclaimer

CAC and payback period calculations are estimates based on period-averaged data. Actual payback may be shorter if customers expand their subscriptions or longer if churn occurs before CAC is recovered.

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Sources & References

NetSuite — Customer Acquisition Cost (CAC): Formula & Best Practices

https://www.netsuite.com/portal/resource/articles/erp/customer-acqusition-cost.shtml

Corporate Finance Institute — CAC Payback Period

https://corporatefinanceinstitute.com/resources/valuation/cac-payback-period/

Calculator Inputs

Calculation Results

CAC & Payback Period Calculator

How CAC & Payback Period Are Calculated

How to Use the CAC & Payback Period Calculator

Enter Sales Spend

Enter Marketing Spend

Enter New Customers Acquired

Enter Monthly ARPU

Set Monthly Churn Rate

Real-World Scenario Example

Important Disclaimer

What is a good Customer Acquisition Cost (CAC)?

How do you calculate CAC payback period?

What costs should be included in CAC?

What is the difference between blended CAC and new customer CAC?

How can I reduce Customer Acquisition Cost?

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SaaS Churn Rate & Customer LTV Calculator

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Sources & References

Calculator Inputs

Calculation Results

CAC & Payback Period Calculator