CAC Calculator
Divides total marketing and sales spend by the number of new customers acquired in the same period. Includes all acquisition costs: ads, salaries, tools, events, and commissions.
High CAC — ensure LTV justifies this spend.
Why CAC Calculator Matters
CAC is the cost of growth. Without knowing it, you cannot know whether your business model is sustainable. A $500 CAC is fine if customers are worth $5,000 over their lifetime — but devastating if they churn after 3 months. Top-performing SaaS companies aim for a LTV:CAC ratio of 3:1 or higher, and recover CAC within 12 months.
Example Calculation
A B2B SaaS company spends $80,000 in a quarter on sales salaries ($50,000), paid advertising ($20,000), and CRM/sales tools ($10,000). They close 160 new customers that quarter. CAC = $80,000 / 160 = $500 per customer. Their average subscription is $200/month with a 24-month lifespan, giving LTV = $4,800. LTV:CAC ratio = 9.6:1 — well above the 3:1 benchmark, suggesting they could profitably increase acquisition spend.
Practical Tips
- Include ALL sales and marketing costs in CAC — not just ad spend. Salaries for sales reps, SDRs, and marketing managers are often the largest component and are frequently excluded by mistake.
- Calculate CAC separately by channel. Your blended CAC might look healthy while one channel (e.g. paid social) has a CAC 5× higher than another (e.g. SEO). Channel-level CAC reveals where to scale and where to cut.
- CAC payback period is often more actionable than raw CAC. If CAC = $600 and a customer pays $100/month, payback period = 6 months. Investors and CFOs typically want this under 12–18 months.
- Recalculate CAC monthly, not just annually. Seasonal campaigns, sales team changes, and algorithm shifts can cause CAC to spike or drop — monthly tracking catches problems before they become expensive.
Frequently Asked Questions
- Customer Acquisition Cost = Total Marketing & Sales Spend / Number of New Customers Acquired. It measures the average cost of converting one prospect into a paying customer, including all related overhead.
- It is entirely relative to your LTV. A CAC of $1,000 is excellent if your LTV is $10,000, but unsustainable if LTV is $500. The universal benchmark is a LTV:CAC ratio of 3:1 or higher and a CAC payback period under 18 months.
- Improve conversion rates at every funnel stage, invest in high-intent organic channels (SEO, referrals), reduce sales cycle length, experiment with product-led growth, and cut underperforming paid channels. Each percentage point of conversion improvement reduces CAC without cutting spend.
- Blended CAC includes all channels including organic. Paid CAC only counts spend on paid acquisition (ads, sponsored content). If you mix them, paid CAC always looks better than it is. Track both: blended CAC for overall efficiency, paid CAC to evaluate ad investment.
- CAC payback period = CAC / (Average Monthly Revenue per Customer × Gross Margin). It tells you how many months it takes to recover the cost of acquiring a customer. Best-in-class SaaS companies aim for under 12 months; under 18 is common for B2B.
- Monthly for operational management, quarterly for strategic review. Monthly tracking catches spikes from algorithm changes, new campaigns, or seasonal effects. Quarterly smooths noise for trend analysis and investor reporting.
Disclaimer
These tools provide estimates for informational purposes only. Results should not be used as the sole basis for financial, business, or legal decisions. Always consult qualified professionals for advice specific to your situation.