Definition
CLTV (Customer Lifetime Value) is the total gross profit an average customer contributes across their entire lifetime as a customer, from first purchase to last.
Also called: Customer Lifetime Value, LTV, Lifetime ValueAcquisition cost meets customer value.
Linear illustration with constant contribution per purchase. Actual purchase timing, returns and customer churn can change the outcome.
Example: acquisition costs of €30,000 and contribution of €250 per purchase. Existing customers are excluded from the CAC denominator.
How we think about CLTV
A simple model: CLTV = average order value × margin × number of purchases over the lifetime. It's the profit — not the revenue — the customer leaves behind once they're done buying from you.
CLTV is the number that gives you permission to be aggressive. If you can absorb a high CAC on the first purchase because the customer comes back three times, you can bid more than the competitor and still make money. It's the entire basis for scaling hard.
CLTV and retention are joined at the hip
CLTV isn't a fixed property of the customer. It's built. Better onboarding, stronger email flows in Klaviyo and a product people want again all raise CLTV. And every euro CLTV rises is a euro more you can afford to spend on acquisition.
That's why we treat acquisition and retention as one system. Chasing cheap CAC without working on CLTV is optimizing half the equation.
A worked example — and the three levers
Make it concrete: an average customer puts €80 in the cart (AOV), you have a 50% margin, and the customer buys 3 times over their lifetime. CLTV = 80 × 0.5 × 3 = €120 in contribution margin. That's the number that sets the ceiling for what you can afford to pay to win the customer — not the €240 in revenue, which would tempt you to overpay.
There are exactly three levers on CLTV, and all are worth pulling: raise AOV (bundling, cross-sell), raise repeat frequency (post-purchase flows, replenishment, subscription), or raise margin (pricing, assortment, shipping structure). Just lift repeat purchases from 3 to 4 in the example and CLTV climbs from €120 to €160 — and your allowable CAC with it.
That's why retention isn't a soft add-on but a lever on the entire acquisition side: every euro CLTV rises is a euro more you can bid in the auction and still make money. The competitor with weaker retention simply can't keep up in the bidding.
Frequently asked questions
Should CLTV be calculated on revenue or profit?
On profit (contribution margin). Revenue CLTV overstates what the customer is worth and makes you overpay for acquisition. Always calculate CLTV after variable costs.
Over what period should CLTV be measured?
Pick a horizon you can act on — often 12 or 24 months. An infinite CLTV looks great in a spreadsheet, but you can't use future profit to pay for ads today.
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The Løgbutikken engagement covered the website, email, Meta, Google Ads and ProfitMetrics. The business grew and was subsequently acquired.
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About the author
Nicklas Segatz Mortensen
Growth hacker and fractional CMO with 10+ years' experience and hundreds of millions in managed ad spend behind him. Background from larger Danish and international scale-ups, and from the agency world.
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