Customer Lifetime Value Calculator

Customer lifetime value is the total gross profit one customer produces across their whole relationship with you, not just on the first order. This customer lifetime value calculator works it out from four inputs you already have: average order value, how often people buy, how long they keep buying, and your gross margin. Most people shorten it to CLV, and you will see the same idea written as LTV in ratios like LTV to CAC.

The reason it matters is straightforward. Acquisition decisions made on first order profit alone are always too conservative. If a customer spends $80 four times a year for three years, judging a campaign on that first $80 order tells you almost nothing about whether the campaign was a good idea. Knowing customer lifetime value is what lets one brand pay $90 for a customer their competitor will not pay $40 for, and still be the one making money.

It cuts the other way too. Businesses selling one time purchases with no repeat behaviour have a CLV close to their first order profit, and no amount of optimistic modelling changes that. In that case the honest move is to accept a low ceiling on acquisition cost and go looking for a second product, a subscription, or a service to attach.

This calculator uses the standard simplified version:

Customer lifetime value = average order value x purchases per year x lifespan in years x gross margin %

Use the defaults loaded above. Your average order value is $80 and a typical customer buys four times a year, so they spend $320 a year with you. Over a three year lifespan that is $960 in revenue. At a 60% gross margin you keep $576, and that is your customer lifetime value.

With a customer acquisition cost of $96, the LTV to CAC ratio is $576 divided by $96, which is 6.0x. That is a strong ratio, and a ratio that strong is usually a signal to spend more rather than a reason to celebrate. It says you are buying customers cheaply enough that there is room to bid higher, enter more expensive channels, or widen targeting before the economics get uncomfortable.

Be clear about what this model does not do. It assumes steady purchase behaviour across the full lifespan, and it applies no discounting for the time value of money, so profit arriving in year three counts the same as profit arriving today. Real cohorts decay: the second year almost always buys less than the first. A finance team would build this from cohort retention curves with a discount rate applied. For planning acquisition budgets, the simple version is close enough, as long as you know which one you are holding.

The single most useful thing to do with customer lifetime value is divide it by customer acquisition cost. Around 3:1 is the conventional target. Under 2:1 the business is spending too much of a customer's worth to get them, and there is rarely enough left for overhead. Over 5:1 you are usually underspending and letting competitors buy the customers you could afford. Run the customer acquisition cost calculator to get an honest denominator, and count every cost in it, not just ad spend.

Also check payback period, which the ratio hides completely. A 4:1 ratio earned over three years still means you are financing every customer for months. Most brands want their acquisition cost back inside a few months of gross profit, and the ones that ignore this run out of cash while growing.

There are only four ways to raise CLV, and they map exactly to the inputs. Raise average order value with bundles, volume pricing, and post purchase upsells. Raise purchase frequency with replenishment reminders, subscriptions, and email flows that arrive when someone is due to run out. Extend lifespan by fixing whatever causes people to stop, which is usually the second order rather than the tenth, so onboarding and the first repeat purchase deserve most of your attention. Raise gross margin by improving unit costs, shipping thresholds, and price. Margin is the quietest lever and often the largest, because it multiplies through the entire calculation.