Growth & Marketing

How do I calculate my target CAC before I've made a single sale?

A starting point

Work backwards from your gross margin per customer and how many months you're willing to wait to earn it back. A common starting rule: keep customer acquisition cost under one third of the lifetime gross profit you expect from that customer, and aim to recover the spend within 6 to 12 months. Since you have no real data yet, use conservative estimates and treat your first campaigns as buying the numbers, not proving profit.

Go deeper

Hand-picked from around the web, each with a note on why it earns your time.

3 resources 3 link-checked Watch Read Use

Watch

▶️ Video
✓ Link checked Free Beginner

Why we picked it Kevin Hale from Y Combinator lays out the acquisition-cost and lifetime-value math in plain language, framed around how much you can afford to spend to win a customer. It is aimed at first-time founders, so there is no jargon wall, just the reasoning you need to set a target CAC. He is also refreshingly blunt that leaning only on paid acquisition is a weak growth story, which is worth hearing early.

Startup Pricing 101

On Y Combinator (Startup School) by Kevin Hale

Startup Pricing 101
  • How much you can spend to acquire a customer falls out of your pricing and how long that customer stays, so pricing and CAC are the same conversation.
  • You can estimate a target CAC before any sales by working backward from margin and expected customer lifetime.
  • Treat paid channels with suspicion: if ads are the only way you grow, your unit economics have to be tight to survive.
Watch on YouTube youtube.com →

Read

✍️ Essay
✓ Link checked Free Intermediate

Why we picked it This is the piece nearly every other CAC explainer is quoting from, so go to the source. Skok walks through how CAC, lifetime value, and the payback period actually relate, and gives you concrete targets (aim for LTV at least 3x CAC, and try to recover CAC within 5 to 12 months) so you can set a number before you have any real data. It is dense, but it is the honest founder-level breakdown, not a hype piece.

SaaS Metrics 2.0: A Guide to Measuring and Improving What Matters

From For Entrepreneurs by David Skok

  • Your target is a ratio, not a single figure: lifetime value should be roughly 3x or more of what it costs to acquire a customer.
  • Watch the payback period separately from the ratio: recovering CAC in under a year keeps you from bleeding cash while you grow.
  • Before a single sale you can back into a target CAC from your expected margin and how long a customer is likely to stay.
Open forentrepreneurs.com →

Use

📋 Template
✓ Link checked Free Beginner

Why we picked it A ready spreadsheet so you can plug in your own margins and spend instead of rebuilding the formulas yourself. It maps CAC, lifetime value, the LTV:CAC ratio, and payback into a simple heatmap, which makes it easy to eyeball whether your target holds up as your assumptions change. No sign-up wall, just a Google Sheet you copy.

CAC LTV Ratio Heatmap Template

From Growth with Gary by Gary Yau Chan

  • You copy the sheet and enter your own acquisition spend and revenue per customer, so the target CAC is yours, not a generic benchmark.
  • The heatmap view makes the payback timeline and the LTV:CAC ratio visible at a glance, which helps stress-test optimistic assumptions.
  • Free and no email required, so it is quick to try before you commit to any tool.
Open growthwithgary.com →

People also ask

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