Customer acquisition cost (CAC) calculator
Enter your total marketing and sales spend alongside new customers acquired to calculate your CAC. Add your LTV to see your LTV:CAC ratio - the metric that determines whether growth is sustainable.
Ad spend, agency fees, software, creative production
Sales team salaries, commissions, tools
Use our LTV calculator to find this
What is CAC and why it determines your growth ceiling?
Customer Acquisition Cost is the total price you pay to win a new customer. Unlike cost per conversion, which usually measures ad spend per action, CAC includes the full picture: advertising, agency fees, software subscriptions, creative production, sales salaries, commissions, and overhead.
The formula is: CAC = (Total Marketing Spend + Total Sales Spend) / New Customers Acquired. This gives you the true cost of growth - the number that determines whether your business model works or whether you are buying revenue at a loss.
The LTV:CAC ratio - your growth compass
CAC means nothing in isolation. A $500 CAC is excellent for a SaaS company with $5,000 LTV and catastrophic for an e-commerce brand with $80 LTV. The LTV:CAC ratio is what matters:
- Below 1:1 - You are losing money on every customer.
- 1:1 to 3:1 - Growth may be happening, but profitability is under pressure.
- 3:1 - The benchmark most healthy growth models target.
- 5:1+ - You may have room to scale more aggressively.
CAC benchmarks by industry
CAC benchmarks vary because customer value varies. Enterprise SaaS can sustain much higher CAC than low-margin retail because payback and lifetime value are radically different. The right question is not whether CAC looks high in isolation - it is whether it is justified by margin and LTV.
How to reduce your CAC
- Improve conversion rates across your funnel - usually the highest-leverage fix.
- Reduce wasted spend with better targeting, exclusions, and stronger creative.
- Invest in channels that compound, such as SEO, content, and lifecycle marketing.
- Strengthen referral, word-of-mouth, and repeat-purchase loops.
- Use email and CRM to nurture leads instead of relying only on paid acquisition.
Frequently asked questions
What is customer acquisition cost (CAC)?
CAC is the total cost of acquiring a new customer, including all marketing and sales expenses. It's broader than cost per conversion or CPA because it includes agency fees, software, salaries, creative production, and overhead - not just ad spend.
How do you calculate CAC?
CAC = (Total Marketing Spend + Total Sales Spend) / Number of New Customers Acquired. For example, if you spent $20,000 on marketing and $10,000 on sales in a month and acquired 150 new customers, your CAC is $200.
What is a good CAC?
There's no universal answer - it depends entirely on your LTV. The benchmark is a 3:1 LTV:CAC ratio. If your LTV is $600, a CAC of $200 is healthy. If your LTV is $150, that same $200 CAC is a problem. Always evaluate CAC relative to what a customer is worth.
What's the difference between CAC and CPA?
CPA (cost per acquisition) typically measures ad spend per conversion. CAC is more comprehensive - it includes all marketing costs, sales team costs, software, and overhead. CPA is useful for campaign-level optimization; CAC is the metric for business-level health.
How does CAC relate to LTV?
LTV:CAC is arguably the most important ratio in your business. It tells you whether your growth is sustainable. Below 1:1 you are losing money on every customer. The 3:1 ratio is the gold standard. Above 5:1, you may be under-investing in growth and leaving market share on the table.
How can I reduce my CAC?
Improve conversion rates across your funnel, invest in organic channels like SEO and content that compound over time, optimize ad targeting and creative to reduce wasted spend, build referral and word-of-mouth programs, and nurture leads with email to reduce reliance on paid acquisition.
What is CAC payback period?
The time it takes for a customer to generate enough revenue to cover their acquisition cost. If your CAC is $200 and each customer generates $50/month in revenue, your payback period is 4 months. Shorter is better - most healthy SaaS businesses aim for under 12 months.
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