Use LTV:CAC Ratio Calculator when a store decision needs a clear next step instead of a vague note.
Free ecommerce tool
LTV:CAC Ratio Calculator
Understand whether customer acquisition economics are healthy enough to scale.
Quick answer
LTV:CAC compares estimated gross-profit value of a customer with the cost to acquire that customer. A healthy ratio still needs a payback window the business can afford.
Average order value, Purchases per year, Gross margin percent, Customer lifespan in years, Customer acquisition cost
A plain-language result, practical caveats, and follow-up actions the team can save or share.
Enter your details to generate a decision-ready output.
Why this matters in a real store
LTV:CAC Ratio Calculator matters because ecommerce growth work usually breaks down in the handoff between a number, a platform warning, a campaign idea, and the person who has to make the next decision. A store team may know something is wrong, but still lose time because the issue is not written in a way that connects the symptom to a next action.
Use this page as a practical translation layer. The goal is to slow down the first reaction, name the business risk, and give the team enough context to decide whether the next move is a calculation, a feed change, a campaign QA step, or a page update. The tables and checklists are there to make the work repeatable, but the judgment comes from understanding why the issue appears in the first place.
What this simple LTV:CAC model includes
This calculator estimates gross-profit LTV from average order value, purchase frequency, customer lifespan, and gross margin. It then divides that value by acquisition cost.
Worked example
A customer with $90 AOV, 2.4 purchases per year, 55% gross margin, and 1.5 years of lifespan has estimated gross-profit LTV of $178.20. If CAC is $42, LTV:CAC is 4.24x before overhead and payback timing.
Why ecommerce teams misuse LTV:CAC
- They use revenue LTV instead of gross-profit LTV.
- They ignore payback timing and cash flow.
- They average together first-time buyers, subscription customers, and discount-only buyers.
- They calculate CAC without creative, agency, or platform fees.
- They assume repeat behavior from a short launch window.
Decision rules
| Result | Interpretation | Next step |
|---|---|---|
| Below 1x | Acquisition is losing money on estimated gross-profit LTV | Pause scale and fix margin, conversion, retention, or targeting. |
| 1x to 3x | Potentially workable but tight | Inspect payback, cohort quality, and channel mix. |
| Above 3x | Healthier unit economics | Still verify cash timing, retention assumptions, and inventory constraints. |
Decision note
Do not average all buyers together when one channel brings discount-led first orders and another brings repeat buyers. A blended LTV:CAC ratio can hide the channel that is actually creating cash.
Segmentation example
| Cohort | Why separate it |
|---|---|
| Full-price first buyers | Often clearer signal of product demand and repeat quality. |
| Discount-led first buyers | May repeat less or require future incentives. |
| Subscription buyers | Lifespan and payback can differ from one-time orders. |
| Affiliate customers | CAC should include commission and related fees. |
Methodology and limits
Use this for a simple first-pass cohort model. Enter AOV, purchase frequency, customer lifespan, gross margin, and CAC for a comparable customer group rather than all buyers mixed together.
The model excludes returns, support, inventory financing, contribution after discounts, and delayed cash flow. It is not a substitute for cohort analysis once enough customer data exists.
Reusable download
Use the related CSV as a working file for the calculation, checklist, or planning step covered on this page.
Common questions
Why not use revenue LTV?
Revenue LTV overstates what is available to repay acquisition cost because product cost and fulfillment still have to be paid.
What ratio is good?
A ratio above 3x is often more comfortable, but fast payback can matter more than the ratio for cash-constrained stores.
Should CAC include creative and agency costs?
For business decisions, yes. Platform spend alone can make acquisition look cheaper than it is.