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CAC Optimizer

Optimize your Customer Acquisition Cost across marketing channels. Calculate blended CAC, LTV/CAC ratio, and understand acquisition efficiency for sustainable growth.

Your numbers

Acquisition cost by channel

Marketing channels

Total revenue expected from a customer

For payback period calculation

Your result appears here

Enter spend and customers won for each channel, plus LTV and monthly gross profit, then calculate. You get blended CAC, LTV to CAC and payback, and the cost per channel.

Methodology and assumptions

Understanding CAC

Customer Acquisition Cost (CAC) measures how much you spend to acquire a new customer. It's one of the most critical metrics for evaluating marketing efficiency and business sustainability.

Calculation Method

  1. Channel CAC: Channel Spend ÷ Customers Acquired
  2. Blended CAC: Total Marketing Spend ÷ Total Customers Acquired
  3. LTV/CAC Ratio: Customer Lifetime Value ÷ Blended CAC
  4. CAC Payback: Blended CAC ÷ Monthly Gross Profit per Customer

Key Benchmarks

  • LTV/CAC Ratio: 3:1 or higher is ideal for SaaS
  • CAC Payback: Under 12 months is healthy
  • Channel CAC: Varies by industry and channel maturity

Optimization Strategies

  • Focus budget on channels with lowest CAC
  • Improve conversion rates to reduce CAC
  • Increase LTV through retention and upsells
  • Test new channels at small scale first
  • Track CAC trends over time, not just snapshots

Questions

What is a good CAC for startups?
A "good" CAC depends on your LTV. The LTV/CAC ratio should be at least 3:1 for sustainable growth. For SaaS startups, CAC typically ranges from $100-$500 for SMB customers and $1,000-$10,000+ for enterprise. The key is ensuring CAC payback is under 12 months.
How do I calculate blended CAC?
Blended CAC is your total marketing and sales spend divided by total new customers acquired in the same period. Include all costs: advertising, salaries, software, agencies, and overhead. This gives you the true average cost to acquire a customer across all channels.
What is a healthy LTV to CAC ratio?
A ratio of 3:1 or higher is considered healthy for most SaaS businesses. This means you earn $3 in lifetime value for every $1 spent on acquisition. Ratios below 1:1 are unsustainable, 1-2:1 needs improvement, and above 5:1 might indicate underinvestment in growth.
How can founders reduce CAC?
Improve conversion rates at each funnel stage, optimize ad targeting and creative, build organic channels (SEO, content, referrals), improve product-market fit to increase word-of-mouth, and focus on channels with proven ROI. Sometimes increasing LTV through better retention is more effective than reducing CAC.

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