Customer Acquisition Cost Calculator – CAC Calculator

Calculate your Customer Acquisition Cost (CAC) from sales and marketing spend, then see your CAC payback period, customer lifetime value (LTV), and LTV:CAC ratio.

Quick Facts

Formula
CAC = Sales & Marketing Spend / New Customers
Fully loaded CAC includes both sales and marketing costs tied to acquiring new customers.
Common benchmark
LTV:CAC of 3:1 or higher
Widely cited in SaaS as a healthy ratio; below 1:1 means a customer costs more than it returns.

Your Results

Calculated
Customer Acquisition Cost
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Spend per new customer (CAC)
CAC payback period
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Months to recover CAC from gross profit
Customer lifetime value
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Total gross profit per customer (LTV)
LTV:CAC ratio
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Lifetime value relative to acquisition cost

Ready

Enter spend, new customers, revenue per customer, gross margin, and customer lifetime, then press Calculate.

How to use the Customer Acquisition Cost Calculator – CAC

Business financial calculators help you move from raw numbers to decision-ready ratios. Whether you're analyzing profitability, valuation, or financial health, the outputs are only as good as the accounting inputs behind them.

Using Customer Acquisition Cost Calculator – CAC effectively

  • Verify that your inputs are on the same accounting basis (GAAP vs. cash) — mixing the two distorts ratios significantly.
  • Compare your result against industry benchmarks, not just an internal target. Margins vary dramatically by sector: SaaS often runs 70%+ gross margin; retail runs 20–40%.
  • Run the calculation across multiple periods to spot trends, not just a single snapshot.

Common interpretation mistakes

  • High gross margin doesn't guarantee profitability — overhead and operating costs still matter.
  • A ratio improving in isolation isn't automatically good: rising revenue with falling margin often signals a structural problem worth investigating.
  • Financial ratios describe the past; projections require assumptions that deserve their own scrutiny.

When to escalate to a specialist

For decisions involving investor presentations, loan covenants, M&A diligence, or regulatory filings, cross-validate this calculator's output with a CFO, accountant, or financial analyst. The math is reliable; the interpretation context is not always captured by a single formula.

Frequently Asked Questions

How accurate are the results?
The Customer Acquisition Cost Calculator – CAC applies a standard formula to your inputs — accuracy depends on how precisely you measure those inputs. For planning and estimation, results are reliable. For high-stakes or professional decisions, cross-check the output with a domain expert or primary source.
What inputs have the biggest effect on the result?
In most financial calculations, the variables with the highest sensitivity are the rate (interest, return, or tax) and time. Try adjusting each by 10-20% to see which one moves the output most — that's where your energy in improving the input estimate is best spent.

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