Customer Lifetime Value (CLV) Calculator

About the Customer Lifetime Value

The Customer Lifetime Value calculator estimates how much revenue and profit an average customer generates over their entire relationship with a business, using average order value, purchase frequency, and expected customer lifespan. Adding a gross margin and an optional acquisition cost turns that estimate into a profit figure and, when available, an LTV to CAC ratio that shows whether acquisition spending is paying off.

How It Works

You enter average order value, purchases per year, average customer lifespan in years, gross margin as a percentage, and optionally customer acquisition cost. The calculator multiplies order value by purchase frequency by lifespan to get revenue-based CLV, then multiplies that by gross margin to get profit-based CLV, subtracts CAC to show profit net of acquisition cost, and if CAC is greater than zero, divides profit-based CLV by CAC to produce an LTV to CAC ratio.

Revenue CLV = Average Order Value x Purchases per Year x Lifespan (years); Profit CLV = Revenue CLV x Gross Margin; Net of CAC = Profit CLV - CAC; LTV:CAC = Profit CLV / CAC

Formula & Methodology

By hand, start by multiplying average order value by how many times a typical customer purchases per year, which gives annual revenue per customer. Multiply that by the average number of years a customer stays active to get total revenue-based CLV over the relationship. Apply gross margin (entered as a percentage and converted to a decimal) to convert that revenue figure into a profit-based CLV, since revenue alone overstates what a customer is actually worth to the business. If an acquisition cost is available, subtract it from profit-based CLV to see net profit per customer after the cost of winning them, and divide profit-based CLV by CAC to get the LTV to CAC ratio, calculated only when CAC is greater than zero.

Examples

Subscription retailer

A store has a $60 average order value, 4 purchases per year, a 3-year average lifespan, and a 40% gross margin. Revenue CLV = $60 x 4 x 3 = $720. Profit CLV = $720 x 0.40 = $288. With a $50 CAC, net profit is $288 - $50 = $238, and the LTV:CAC ratio is $288 / $50 = 5.76:1.

Lower-margin, higher-frequency business

A meal kit service has a $45 average order, 12 purchases per year, a 1.5-year average lifespan, and a 25% gross margin. Revenue CLV = $45 x 12 x 1.5 = $810. Profit CLV = $810 x 0.25 = $202.50.

Advantages

Separates revenue-based value from profit-based value, avoiding the common mistake of treating gross revenue as if it were the actual worth of a customer.
Produces an LTV:CAC ratio directly when acquisition cost is provided, giving a quick health check against the commonly cited 3:1 benchmark.
Uses only inputs a business typically already tracks, average order value, purchase frequency, retention, and margin, making it usable without specialized analytics tools.

Common Mistakes

Using gross revenue CLV instead of profit-based CLV when comparing against acquisition cost, which makes acquisition spending look more profitable than it actually is.
Overestimating average customer lifespan based on best-case customers rather than actual average retention across the full customer base.
Leaving CAC blank and then trying to judge acquisition efficiency, when the ratio requires a real acquisition cost figure to calculate.

Edge Cases to Watch For

CAC is an optional, advanced field - if it's left at zero, the calculator still shows revenue and profit-based CLV but displays a dash instead of an LTV:CAC ratio, since dividing by zero CAC is undefined.
The lifespan and purchase frequency inputs are estimates rather than measured churn data, so the resulting CLV is only as accurate as those assumptions - a business with rapidly changing retention should update these figures regularly.
Because gross margin is applied as a flat percentage across the entire lifespan, the calculator assumes margin stays constant over time rather than improving or declining as the customer relationship matures.

Common Use Cases

Marketing and finance teams setting a maximum acceptable acquisition cost based on what a customer is actually worth in profit.
Subscription and e-commerce businesses forecasting long-term customer value from order value, frequency, and retention data.
Founders and investors evaluating unit economics by comparing LTV to CAC as part of growth sustainability analysis.

Frequently asked questions

What's a healthy LTV:CAC ratio?

A commonly cited benchmark is 3:1 or higher - meaning a customer's lifetime profit should be at least 3 times what it cost to acquire them. Below 1:1 means you're losing money on every customer relationship.

How is CLV calculated here?

Revenue-based CLV = average order value × purchase frequency per year × customer lifespan in years. Multiplying by your gross margin converts that to profit-based CLV, which is the more meaningful figure for acquisition-spend decisions.

Conclusion

CLV translates order value, purchase habits, and retention into a concrete profit figure per customer, and pairing it with acquisition cost shows whether growth spending is sustainable. Because the estimate depends on assumed lifespan and margin, it's most useful when those inputs are revisited as actual retention and cost data comes in.