Customer lifetime value (LTV) for Shopify merchants, in plain English

Customer lifetime value is the answer to a practical question: how much is this customer worth to me across our whole relationship? Not this order — all of them. It matters because it quietly re-prices everything else: what you can afford to spend acquiring a customer, which ones deserve a $1.50 postcard, and whether your store’s growth is compounding or leaking.

The plain-English math

Historical LTV = everything a customer has spent with you so far. Sum their orders; done.
Predictive LTV = historical spend plus what they’re likely to spend next. Useful, but it’s a model’s opinion — start with the number that’s a fact.

For most retention decisions, historical lifetime spend is enough, because you’re usually ranking customers rather than forecasting them — and past spend is the best single predictor of future spend anyway.

The distribution is the insight

Store averages hide the shape that matters: in most consumables stores a small slice of customers — often something like the top fifth — accounts for the clear majority of revenue. That skew is the entire case for treating customers differently. The marketing that makes sense for a $400-lifetime customer is absurd for a $19 one-timer, and vice versa.

LTV as a spending gate

The cleanest use of LTV is as a threshold that decides who gets the expensive touch:

• Everyone gets the free rungs — the QR on the box, the reminder email.
• Customers above a lifetime-spend bar (say $200) also earn the printed postcard when they don’t respond — because one recovered reorder repays the stamp many times over.
• Campaign segments built on spend (“$100+ all-time”) are the warmest audiences a campaign can mail — highest response, highest order values, easiest ROI math.

Setting the bar is arithmetic, not art: a $1.50 card against your margin on a typical reorder tells you how much lifetime value justifies the spend comfortably. When in doubt, start the bar high, watch it pay, then lower it stepwise.

Growing LTV (the part retention owns)

LTV = order value × orders per year × years retained, and the biggest lever for consumables is the middle term: one extra reorder per customer per year is often a double-digit revenue change. That’s precisely what reorder marketing exists to do — catch the run-outs that would otherwise become quiet churn. Measure whether it’s working the honest way: a holdout on your reminded customers, and an LTV trend line that bends up.