What is customer lifetime value?
Customer lifetime value is the money one customer brings you over a defined window, not just the first order. It is the number that decides how much you can afford to pay for acquisition, which makes it the most consequential estimate in your account.
Margin LTV = Revenue LTV × Contribution margin rate
Two versions, one honest. Revenue LTV counts every dollar a customer spends. Margin LTV counts what those dollars leave behind after product cost, shipping, fees, and other variable costs. You pay for ads out of margin, not revenue, so margin LTV is the number that belongs next to CAC. Quoting revenue LTV in a CAC decision overstates what a customer can fund by the inverse of your margin rate, which at typical DTC margins is roughly double.
One more framing before you touch the inputs: LTV is a forecast, not an accounting fact. Every input is an average that drifts as your product mix, pricing, and retention change. Treat the output as a planning ceiling you re-derive quarterly, not a constant you set once and defend in meetings.
Worked example
Take the calculator's defaults: an $80 average order value, 2.4 orders per customer per year, a 2-year window, and a 55% contribution margin rate.
$384.00 × 55% = $211.20 margin LTV
That customer places 4.8 orders over two years: $192 of revenue and $105.60 of margin per year. Now watch the two LTVs argue about the same CAC. At a $70 CAC, revenue LTV says you are earning 5.5:1 and should spend harder. Margin LTV says the true ratio is 3.0:1, and $70 of it is gone on day one while the rest arrives over two years. Both read the same customer; only one of them can sign off on a budget. If you don't know your margin rate, compute it first with the Contribution Margin Calculator.
Estimating orders per year and the window from your data
The inputs are simple; getting them honest takes ten minutes in your order data. For orders per year, pull customers who first purchased 12–24 months ago and divide their total orders by customer count and by years elapsed. Using all-time averages instead quietly mixes week-old customers (one order, no time to repeat) with veterans, and drags the number down. Net out refunds while you are in there: a returned order is retention theater, not revenue.
For the window, pick the horizon where repeat behavior actually flattens. For most DTC brands a 12- or 24-month cohort view covers the bulk of repeat orders. Value beyond that is a rounding error you shouldn't bank on. A shorter window gives a smaller, safer LTV; a longer one inflates it with orders you may never see. When in doubt, run the calculator at both 1 and 2 years and treat the gap as your uncertainty. AOV should be the blended figure across new and returning orders; the AOV Calculator computes it from revenue and order counts.
One-off products vs subscriptions
The formula bends to fit both business models. For a mostly one-off product, think mattresses or luggage, orders per year lands near 1 and the window near 1, so LTV collapses toward first-order economics. That is the correct answer: don't manufacture a lifetime the product doesn't have.
For subscriptions, orders per year is your billing frequency times the fraction of subscribers still active, and the window is your average subscription length. A monthly box with typical churn might model as 12 billings × 65% average retention ≈ 7.8 orders in year one. Enter 7.8, not 12. The single biggest subscription-LTV mistake is multiplying the billing schedule as if nobody cancels.
Hybrid catalogs, a one-off hero product plus a consumable refill, deserve two passes. Model the customer types separately, then weight by the share of new customers who enter through each. One blended LTV across both usually means the subscription cohort is quietly subsidizing acquisition math the one-off cohort can't support.
LTV means nothing without CAC next to it
On its own, $211.20 of margin LTV is trivia. It becomes a decision the moment you divide it by what a customer costs to acquire. Compute CAC with the CAC Calculator, then put the two together in the LTV:CAC Ratio Calculator. A 3:1 margin-based ratio is the classic directional target. Then check timing with the CAC Payback Calculator: at $105.60 of margin per year, a $70 CAC pays back in about 8 months. Ratio says whether the customer is worth buying; payback says whether your cash flow survives the wait. Plenty of brands have died with a great ratio and a 20-month payback.
Frequently asked questions
Should I use revenue LTV or profit LTV?
Use margin (profit) LTV for any decision that involves spending money: CAC ceilings, bids, payback. Revenue LTV is fine for sizing a market or tracking retention trends, because it moves with the same behavior. The danger is mixing them: a 3:1 revenue-based ratio at a 55% margin is really 1.65:1, which is barely above water.
What time window should LTV use?
Match the window to the decision. For paid acquisition targets, 12 months is the common directional choice: long enough to capture real repeat behavior, short enough that the cash arrives while you still run the company. Use 24+ months for strategic questions like pricing or channel mix, and label every LTV you share with its window.
How do I estimate purchase frequency without cohort tooling?
A spreadsheet export is enough. Pull all orders from customers whose first purchase was 12–24 months ago, count orders per customer, and divide by the years elapsed. Even a sample of a few hundred customers beats guessing, and it sidesteps the all-time-average trap of counting customers who haven't had time to repeat.
How do I estimate LTV for a new brand with no repeat data?
Start with LTV equal to first-order value: orders per year 1, window 1. Make ads work at that number. After 60–90 days, measure how much your earliest cohorts actually reordered and raise the inputs to what you observed, not what a benchmark deck promises. Borrowed repeat rates are how new brands overspend their way into a cash crunch.
Is LTV-based bidding safe?
It is leverage, and leverage cuts both ways. Bidding to margin LTV instead of first-order value lets you outspend competitors, but you are fronting cash against orders that arrive over months and can vanish if retention slips. Keep the payback period inside your cash runway, re-measure cohorts quarterly, and never bid against revenue LTV; that is spending money you never keep.
What margin rate should I enter?
Contribution margin: revenue minus product cost, shipping and fulfillment, payment processing, and other per-order variable costs, before ad spend and fixed costs. Gross margin off the P&L usually omits fulfillment and fees and will flatter the result. Blend across your catalog if repeat orders skew to different products than first orders.
Where StefanBrain fits
LTV tells you the most a customer is worth; acquiring them below that number is a creative problem. StefanBrain generates the static ads, video ads, landing pages, and copy tests that pull CAC down, then launches winners to Meta and reads the results back. Pair this page with the LTV:CAC Ratio Calculator to turn the value you just computed into an acquisition target worth beating.