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Marketing • Sales • Growth

CAC Calculator

Find out exactly what it costs to win one new customer, and whether that cost is healthy compared to what that customer is worth over time — the LTV:CAC ratio investors ask about first.

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Why Use This CAC Calculator?

  • ✓ Calculates Customer Acquisition Cost (CAC) from your spend and new customers.
  • ✓ Shows your LTV:CAC ratio to see if that spend is actually working.
  • ✓ Useful for comparing marketing channels or campaigns.
  • ✓ No account or spreadsheet needed — just plug in your numbers.

On This Page

CAC Calculator Formula Quick Reference Key Terms Explained Where It's Used Worked Examples Tips & Mistakes FAQs

CAC Calculator

Converts your entered amounts between currencies at an approximate exchange rate.
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Ad spend, content, tools, agency fees for the period.
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Sales salaries, commissions, sales tools for the period.
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New customers won during the same period.
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Leave as-is or set to 0 to skip the LTV:CAC ratio.

About CAC Calculator

Customer Acquisition Cost tells you how much you spend, on average, to win one new paying customer. On its own it's just a number — compared against customer lifetime value, it tells you whether your growth spend is actually profitable.

Results

Customer Acquisition Cost (CAC)
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Total Spend
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LTV:CAC Ratio
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Health Check
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Summary

Enter values to see your results.

CAC Calculator Formula

Customer Acquisition Cost

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

LTV:CAC Ratio

Ratio = Average Customer LTV ÷ CAC

Healthy Benchmark

A ratio of 3:1 or higher is generally considered healthy for most subscription and repeat-purchase businesses.

Worked Example

$8,000 marketing + $4,000 sales spend, 60 new customers → CAC = $200. With an LTV of $900, ratio = 4.5:1 — healthy.

Quick Reference

LTV:CAC RatioWhat It Means
Below 1:1Losing money on every customer acquired
1:1 – 2:1Weak — barely breaking even after overhead
3:1Healthy — the widely-cited benchmark
5:1 or higherVery strong, though may signal under-investing in growth

What Lowers CAC

  • Improving conversion rate on existing traffic.
  • Referral and word-of-mouth programs.
  • Better targeting to reduce wasted ad spend.

What This Doesn't Capture

  • Time-to-payback (how many months until CAC is recovered).
  • Channel-by-channel differences — calculate CAC per channel too.
  • Fully-loaded costs like overhead, unless you include them in spend.

Key Terms Explained

Two numbers, read together, tell you whether your customer growth engine is actually profitable.

🎯 Customer Acquisition Cost (CAC)

  • Total sales and marketing spend divided by new customers won.
  • Should be calculated over the same time period on both sides.
  • Lower isn't always better — check it against LTV, not in isolation.

💎 Customer Lifetime Value (LTV)

  • What an average customer is worth over their full relationship with you.
  • Use the LTV Calculator for a detailed estimate.
  • Pairs with CAC to judge whether growth spend is worth it.

⚖️ LTV:CAC Ratio

  • The single number investors ask about most in growth-stage businesses.
  • 3:1 is the most commonly cited healthy benchmark.
  • Track it by channel, not just as one blended company-wide number.

⏱️ CAC Payback Period

  • How many months of revenue it takes to recover the acquisition cost.
  • Shorter payback means less cash tied up before a customer becomes profitable.
  • Not calculated here, but worth tracking alongside LTV:CAC.

Where CAC Is Used

📣 Comparing Marketing Channels

Calculate CAC separately for paid ads, organic, referral and outbound to see what's actually working.

💰 Budget Planning

Decide how much you can spend to acquire a customer while staying profitable.

📈 Investor Reporting

LTV:CAC is one of the first unit economics metrics investors ask about.

🧪 Campaign Testing

Compare CAC before and after a campaign change to see real impact.

🛍️ E-Commerce Growth

Check whether paid acquisition is still profitable as ad costs rise.

🤝 Sales Team Efficiency

Include sales costs, not just marketing, for a true acquisition cost.

Worked Examples

Example 1 — Healthy SaaS Business

Marketing $8,000 + Sales $4,000, 60 new customers, LTV $900 → CAC $200, Ratio 4.5:1 — healthy.

Example 2 — Overspending on Ads

Marketing $20,000 + Sales $2,000, 40 new customers, LTV $400 → CAC $550, Ratio 0.7:1 — losing money per customer.

Example 3 — E-Commerce Brand

Marketing $15,000 + Sales $0, 300 new customers, LTV $150 → CAC $50, Ratio 3:1 — right at the healthy benchmark.

Best Practices & Common Mistakes

✅ Best Practices

  • Calculate CAC over the same time period as the customers it produced.
  • Include both marketing and sales costs, not marketing spend alone.
  • Track CAC per channel, not just one blended company-wide figure.
  • Compare CAC against LTV, never look at it as a standalone number.
  • Recalculate regularly — CAC tends to rise as a channel gets saturated.

❌ Common Mistakes

  • Leaving out sales team costs and only counting ad spend.
  • Comparing CAC across a different time window than the customers counted.
  • Using an LTV estimate from a different customer segment or channel.
  • Ignoring CAC payback period, which matters as much as the ratio.
  • Chasing the lowest possible CAC instead of the best LTV:CAC ratio.

Frequently Asked Questions

There's no universal "good" CAC — it depends entirely on your average order value or LTV. A $50 CAC is great for a $500 product and terrible for a $60 product.
3:1 is the most commonly cited healthy benchmark. Below 1:1 means you're losing money per customer; above 5:1 may mean you're under-investing in growth.
Yes — a true CAC includes both marketing and sales costs involved in winning the customer, not just ad spend.
Cost per lead measures spend per lead generated. CAC measures spend per paying customer acquired — leads that don't convert aren't counted.
Yes, and it's recommended. Run this calculator separately for each channel's spend and customers to see which channels are actually efficient.
You can leave LTV at 0 or skip it — CAC will still calculate on its own. Use the LTV Calculator once you have enough purchase history to estimate it.

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