Customer Acquisition Cost: How to Calculate CAC for Bootstrapped SaaS
CAC is easy to calculate when you have paid ads. It gets harder — and more important — when your acquisition is organic. Here is how to think about it.
Customer Acquisition Cost (CAC) is the total cost of acquiring one paying customer. For VC-backed companies running paid ads, this is a straightforward calculation. For bootstrapped founders using SEO, content, and word of mouth, it requires a bit more thought.
The basic formula
CAC = total sales and marketing spend ÷ new customers acquired in the same period. If you spent $500 on ads last month and acquired 10 customers, your CAC is $50.
CAC for organic channels
If your primary acquisition channels are free, your monetary CAC may be near zero — but your time CAC is not. Factor in the hours you spend on content, community, and outreach and assign an opportunity cost to them. A founder who spends 20 hours a week on distribution at a $100/hour opportunity cost is spending $2,000/month on acquisition, even if no money changes hands.
Payback period
More useful than raw CAC is the payback period: how many months of customer revenue does it take to recover the acquisition cost? For bootstrapped SaaS, a payback period under 6 months is healthy. Over 12 months means you need to fund growth before it compounds.
Why low CAC is a moat
A bootstrapped product with a near-zero monetary CAC through organic channels has a structural advantage over funded competitors. It means you can price lower, survive longer, and grow without external capital. Track and protect it.
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