Enter your box economics and churn rate to check your subscription health
Customer Lifetime Value (LTV)
--
Net profit from one subscriber over their whole lifetime
LTV : CAC Ratio
--
Lifetime value returned per dollar of acquisition cost
📦 Your Box Economics and Churn Reality
Box Economics Panel
$
What each subscriber pays you per month for the box.
$
Product, packaging, and shipping cost to fulfill one box.
$
Total marketing spend divided by new subscribers acquired.
Churn Reality Panel
%
Share of subscribers who cancel each month. 10% means the average subscriber stays 10 months.
--
Months a subscriber stays, from your churn rate
The Lifetime Journey: From First Box to Net Profit
Follow one subscriber across their whole lifespan: total recurring revenue at the top, then the cost of every box they receive and the one-time cost to acquire them, arriving at your true lifetime profit (LTV).
Average Customer Stays For
--
Total Lifetime Revenue
--
Lifetime COGS (all boxes shipped)
--
Upfront CAC (one-time)
--
Net Profit (Customer Lifetime Value)
--
Gross Margin Per Month
--
Subscription price minus COGS
Estimated Customer Lifetime
--
Months, from 1 divided by churn rate
Total Lifetime Revenue
--
Months stayed times monthly price
Running a software or general business model instead of a physical box? See also the CAC and LTV Calculator for SaaS and retail unit economics, or the SaaS Churn Rate and MRR Forecaster to project how your recurring revenue compounds over time.
📖 Key Terms Explained
Churn Rate
The percentage of active subscribers who cancel in a given month. It is the single biggest driver of subscription value, because it decides how long the average customer stays and therefore how much lifetime revenue each one produces.
LTV (Customer Lifetime Value)
The total net profit you earn from one subscriber across their entire lifetime, after the cost of every box they receive and the one-time cost to acquire them are subtracted. It is the headline number that tells you what a customer is truly worth.
CAC (Customer Acquisition Cost)
The total amount you spend to win one new paying subscriber, found by dividing all sales and marketing spend by the number of new subscribers it produced. It includes ads, free first boxes, discounts, and creator fees, not just ad cost.
COGS (Cost of Goods Sold)
The direct cost to fulfill one box: the products inside, the packaging, and the shipping to the customer. Subtracting COGS from the subscription price gives your gross margin per box.
MRR (Monthly Recurring Revenue)
The predictable revenue your subscription generates every month, equal to the number of active subscribers times the monthly price. Each lost subscriber is a permanent reduction in MRR until you replace them.
LTV : CAC Ratio
Customer lifetime value divided by acquisition cost, the clearest measure of subscription health. The industry benchmark is 3 to 1 or higher, meaning every dollar spent acquiring a subscriber returns at least three dollars of lifetime value.
Gross Margin Per Month
The profit on a single box before acquisition cost, equal to the subscription price minus the cost of goods and shipping. This is the amount each retained subscriber contributes every month they stay.
Customer Lifetime
The average number of months a subscriber stays before canceling, estimated as 1 divided by the monthly churn rate. A 10 percent churn rate implies a 10 month lifetime; a 5 percent rate implies 20 months.
Lifetime Revenue
The total recurring revenue one subscriber pays over their whole lifespan, equal to the average customer lifetime in months times the monthly subscription price. It is the top line of the lifetime journey, before any costs.
CAC Payback
How many months of gross margin it takes to earn back the cost of acquiring a customer, found by dividing CAC by the gross margin per month. A short payback means you recoup acquisition spend quickly and can reinvest sooner.

The Complete Guide to Subscription Box Churn and LTV

A 40 dollar subscription box looks like a steady, dependable sale, but the real economics of a subscription business are decided by two numbers most founders underweight: how long the average subscriber stays, and how much it cost to bring them in. Churn quietly sets your customer lifetime, lifetime sets your revenue per customer, and acquisition cost decides whether that revenue is profit or a loss. This guide explains the math behind the subscription box churn calculator above, why the LTV to CAC ratio is the number investors and operators trust most, and how a few points of churn reduction can transform your unit economics.

How to Use This Subscription Box Churn Calculator

Work through the two panels. In the Box Economics panel, enter your Monthly Subscription Price, the Cost of Goods and Shipping Per Box, and your Customer Acquisition Cost. In the Churn Reality panel, enter your Average Monthly Churn Rate, the share of subscribers who cancel each month. Everything recalculates instantly as you type, with no submit button to press. The hero shows your Customer Lifetime Value next to your LTV to CAC ratio, the lifetime journey receipt breaks down exactly how one subscriber turns into profit, and the health banner gives you an instant green, yellow, or red verdict based on the industry standard ratio.

The Subscription Engine, Step by Step

The engine runs entirely in your browser and follows the standard subscription unit economics model. First it finds your Gross Margin Per Month, which is the subscription price minus the cost of goods and shipping. Next it converts churn into an Estimated Customer Lifetime using the well known formula of 1 divided by the churn rate expressed as a decimal, so a 10 percent monthly churn becomes a 10 month average lifetime. Total Lifetime Revenue is that lifetime times the monthly price. Finally, Customer Lifetime Value is the gross margin per month times the customer lifetime, minus the one-time acquisition cost, and the LTV to CAC ratio is simply LTV divided by CAC. Every dollar figure is rounded to exact cents using floating-point-safe arithmetic so the receipt always adds up.

Gross Margin Per Month = Subscription Price - COGS
Estimated Customer Lifetime = 1 / (Churn Rate % / 100)
Lifetime Revenue = Customer Lifetime x Subscription Price
LTV = (Gross Margin Per Month x Customer Lifetime) - CAC
LTV : CAC Ratio = LTV / CAC

A Worked Example

Suppose your box sells for 40 dollars a month, your cost of goods and shipping is 25 dollars per box, your acquisition cost is 30 dollars, and your monthly churn is 10 percent. Your gross margin per month is 40 minus 25, which is 15 dollars. A 10 percent churn rate gives an average customer lifetime of 1 divided by 0.10, which is 10 months. Over those 10 months the subscriber pays 10 times 40, or 400 dollars in total lifetime revenue, while you spend 10 times 25, or 250 dollars on the boxes you ship them. Subtract that 250 dollars of lifetime COGS and the one-time 30 dollar acquisition cost from the 400 dollars of revenue and you keep 120 dollars in customer lifetime value. Your LTV to CAC ratio is 120 divided by 30, which is 4.0 to 1, comfortably above the 3 to 1 benchmark, so the health banner flags green and the box is ready to scale.

Why the LTV to CAC Ratio Decides Subscription Health

The reason this single ratio carries so much weight is that it folds price, cost of goods, churn, and acquisition cost into one honest verdict. A ratio of 3 to 1 or higher means your subscription box is highly profitable and ready to scale, because every dollar you put into acquiring subscribers returns at least three dollars of lifetime value, so spending more on growth multiplies your profit. A ratio between 1 to 1 and 3 to 1 means you are vulnerable: you do make money, but the margin is thin enough that a small rise in acquisition cost or churn can wipe it out, so the priority is reducing churn or lowering acquisition cost before scaling. A ratio below 1 to 1 is unsustainable, because you lose money on every customer you acquire, and pouring more budget into growth only deepens the loss. This is why the banner on this tool keys directly off the ratio rather than raw profit.

How Churn Quietly Controls Everything

Churn deserves special attention because it has a leveraged, nonlinear effect on value. Cutting churn from 10 percent to 5 percent does not improve your lifetime value by a modest amount, it doubles it, because the average customer lifetime jumps from 10 months to 20 months and every one of those extra months adds another full gross margin of profit on a customer you already paid to acquire. The same effort spent acquiring new subscribers rarely produces that kind of compounding return, because each new customer carries the full acquisition cost again. That is why experienced operators treat retention, not acquisition, as the highest-leverage lever once a box has product-market fit. Enter different churn rates in the calculator above and watch how dramatically the LTV and the ratio respond, far more than an equivalent change in price or cost of goods.

Reading the Health Banner and Lifetime Journey

A green Excellent Health banner means your LTV to CAC ratio is 3 to 1 or higher, the level where the box is profitable enough to scale aggressively. A yellow Vulnerable banner means the ratio sits between 1 to 1 and 3 to 1, so you are profitable but should focus on reducing churn or lowering acquisition cost before you spend more on growth. A red Unsustainable banner means the ratio is below 1 to 1, so your acquisition cost is higher than the lifetime value a customer ever returns and you lose money on every signup. The lifetime journey receipt below the hero exists to make one truth obvious: the total lifetime revenue at the top is never what you keep. Watch the cost of every box and the upfront acquisition cost stack up against that total, and you will build an instinct for which combinations of price, cost, churn, and acquisition spend actually produce a profitable subscription.

Frequently Asked Questions

For a physical subscription box, a healthy monthly churn rate usually sits between 5 and 10 percent, and the very best curated boxes manage to hold churn below 5 percent. Subscription boxes naturally churn faster than software because the product is a recurring physical delight rather than a tool a business depends on, so subscribers cancel the moment the novelty fades, the budget tightens, or a box disappoints. The math matters more than the headline number: a 10 percent monthly churn rate means the average subscriber stays only 10 months, while cutting churn to 5 percent doubles that lifetime to 20 months and therefore doubles the lifetime revenue from every customer you already paid to acquire. Because acquisition is expensive, a few points of churn reduction is almost always worth more than the same effort spent chasing new subscribers. Enter your real churn rate in this calculator and watch how strongly it moves your customer lifetime value and your LTV to CAC ratio.
The LTV to CAC ratio is the single clearest measure of whether a subscription business is healthy, because it compares the lifetime net profit you earn from a customer against the upfront cost you paid to acquire them. The widely used industry benchmark is 3 to 1: for every dollar you spend acquiring a subscriber, you want at least three dollars of lifetime value back. A ratio of 3 to 1 or higher means the box is highly profitable and ready to scale, because you can confidently pour money into acquisition knowing it returns a strong multiple. A ratio between 1 to 1 and 3 to 1 means you are profitable but vulnerable, since a small rise in acquisition cost or churn can erase your cushion. A ratio below 1 to 1 means you lose money on every customer you acquire, which is unsustainable no matter how fast you grow, because scaling simply multiplies the loss. The ratio works because it folds price, cost of goods, churn, and acquisition cost into one honest number.
Customer Acquisition Cost is the total amount you spend to win one new paying subscriber, found by dividing all of your sales and marketing spend over a period by the number of new subscribers that spend produced. Add up everything that went toward acquisition in the period: paid ads on Meta and TikTok, influencer fees and affiliate commissions, discount codes and free first boxes, the salaries of staff working on growth, and any agency or software costs tied to marketing. Then divide that total by the count of new subscribers acquired in the same period. If you spent 6,000 dollars across all channels in a month and gained 200 new subscribers, your CAC is 30 dollars. New founders almost always understate CAC by counting only the ad spend and forgetting the cost of free boxes, creator gifting, and discounting, all of which are real money spent to acquire a customer. Use your true blended CAC in this calculator, not just the ad cost, or your LTV to CAC ratio will look far healthier than it really is.
Because lifetime value rises directly as churn falls, retention is the highest-leverage thing a subscription box can improve. Start with onboarding: the first one or two boxes decide whether a subscriber stays, so make the unboxing memorable and set clear expectations about what arrives and when. Offer prepaid 3, 6, and 12 month plans, which lock subscribers in and lift the average lifetime far above the monthly churn would suggest. Add variety and a sense of progression so the box never feels repetitive, and use a save or pause flow at cancellation, since many subscribers will accept a skipped month or a discount instead of leaving entirely. Watch for the predictable cancel points, often right after the novelty of the first few boxes wears off, and intervene with a surprise upgrade or a loyalty reward before they hit. On the value side, you can also raise lifetime value by gently increasing price, improving gross margin per box through better sourcing, or adding upsells, but reducing churn is almost always the most powerful lever because it compounds across every month a customer stays.
No. Every calculation runs entirely inside your own browser using client-side JavaScript. The subscription price, cost of goods, acquisition cost, and churn rate you enter are never transmitted, saved, or shared with any server. Nothing you type leaves your device, so your unit economics and profit numbers stay completely private.