Plain answer
LTV (lifetime value) is the total profit one customer brings you across the whole relationship, not just their first purchase. A customer who returns four times is worth several first orders. LTV decides how much you can afford to pay for acquisition — it sets the ceiling on your ad economics.
How LTV actually works
A simple, owner-grade estimate needs three numbers you already have. Multiply them:
- Average order profit — say $60
- Purchases per year — say 4
- Years a customer typically stays — say 2
That's a $480 LTV. Not accounting-grade precision — it doesn't need to be. It needs to be closer to the truth than "one sale."
Subscription businesses get it even more directly: monthly profit per customer × average months before cancelling.
The LTV-to-CAC comparison
LTV earns its keep next to customer acquisition cost. If a customer is worth $480 and costs $120 to win, every acquisition buys $360 of future profit — spend confidently. If LTV barely covers CAC, ads can't carry the business no matter how well they're run; the fix is retention or pricing, not targeting. The wider the gap, the harder you can press on acquisition.
Why first-purchase thinking undercharges your ads
Judged on first purchase alone, plenty of good campaigns look like losers. A $50 CPA against a $40 first order reads as a loss — and is a clear win if that customer reorders all year. Businesses that know their LTV can "overpay" for customers their first-purchase competitors walk away from. That's not recklessness; it's better arithmetic.
What this means for your ads
Estimate your LTV once, even roughly, before judging any campaign. Then set your target CPA as a fraction of it that fits your cash flow. If you don't yet have repeat-purchase data, use first-purchase profit and treat every reorder as upside — the conservative version still beats guessing.
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