LTV to CAC Ratio Calculator
Enter your average order value, gross margin, purchase frequency, customer lifespan, and acquisition cost to see your customer lifetime value, LTV to CAC ratio, and how many orders it takes to earn your acquisition spend back.
LTV & CAC Inputs
Annual customer value: $55.00 at a 40.00% gross margin.
The LTV to CAC ratio compares the gross-profit lifetime value of a customer to what you spend to acquire them. A ratio of 3:1 or higher is considered healthy, meaning you earn three dollars of lifetime margin for every dollar of acquisition cost. Ratios below 1:1 lose money on every new customer.
What the LTV to CAC Calculator Does
The LTV to CAC Ratio Calculator measures whether your customer acquisition spending is sustainable. It converts your average order value, gross margin, purchase frequency, and customer lifespan into a lifetime value (LTV), then divides that figure by your customer acquisition cost (CAC). The result is a single ratio that tells you how efficiently your marketing dollars turn into long-term profit, plus how many orders it takes to earn your acquisition spend back.
Who Should Use This Tool
DTC & Subscription Brands
Founders checking whether repeat purchase revenue justifies rising paid-acquisition costs on Meta and Google.
Growth & Performance Marketers
Media buyers setting target CAC ceilings so campaigns stay above a 3:1 lifetime value ratio.
LTV, CAC & Payback Terms Defined
The total gross profit a customer generates across their entire relationship with your store.
The average sales and marketing spend required to convert one new paying customer.
The number of orders needed for a customer's gross profit to repay their acquisition cost.
LTV to CAC Formula Breakdown
This calculator uses gross-profit LTV rather than raw revenue. Basing the ratio on margin dollars keeps the number honest, because revenue you never keep cannot pay back acquisition spend.
The 3:1 LTV to CAC Benchmark
The widely cited rule of thumb is a 3:1 LTV to CAC ratio. At that level, each customer returns three dollars of lifetime gross profit for every dollar of acquisition spend, leaving room to fund overhead and reinvest in growth. Here is how the tiers break down.
| Ratio | Verdict | What It Means |
|---|---|---|
| 3:1 or higher | Strong | Efficient acquisition with margin to reinvest. You can often afford to spend more to grow faster. |
| 1:1 to 3:1 | Okay | You recover acquisition cost but leave little cushion. Improve retention or trim CAC. |
| Below 1:1 | Weak | You lose money on every new customer. Acquisition spend is unsustainable at this level. |
A ratio far above 3:1 is not automatically ideal. It can signal that you are underinvesting in growth and could capture more market share by spending more per customer.
Understanding CAC Payback
The LTV to CAC ratio tells you whether acquisition is profitable over a customer's whole lifetime, but it says nothing about how fast you get your cash back. CAC payback answers that question by measuring how many orders of gross profit it takes to repay acquisition cost. A shorter payback frees up cash to reinvest in the next customer, which matters most for stores funding growth from operating cash flow rather than outside capital.
Two brands can share the same 3:1 ratio yet behave very differently. One recovers CAC in the first order and one takes six orders spread over two years. The first compounds far faster because capital is not tied up waiting for repeat purchases.
Worked Example: Subscription Coffee Brand
A coffee brand has a $55 average order value at a 40% gross margin. Customers order 2.5 times per year and stay for 3 years, and paid ads cost $35 to acquire each new customer.
A 4.7:1 ratio sits comfortably above the 3:1 benchmark, and recovering acquisition cost in fewer than two orders means the brand can reinvest quickly and scale its ad spend with confidence.
Common LTV to CAC Mistakes
Frequently Asked Questions
What is a good LTV to CAC ratio for ecommerce?
A 3:1 ratio is the common healthy benchmark, meaning three dollars of lifetime gross profit for every dollar of acquisition cost. Ratios between 1:1 and 3:1 are workable but leave thin margins, while anything below 1:1 loses money on every customer.
Should LTV use revenue or gross profit?
Use gross profit. This calculator multiplies average order value by your gross margin so the lifetime value reflects money you actually keep. Revenue-based LTV overstates the ratio and can make unprofitable acquisition look healthy.
What is CAC payback and why does it matter?
CAC payback is the number of orders of gross profit needed to repay acquisition cost. A short payback returns cash quickly so you can reinvest in the next customer, which is critical when you fund growth from operating cash flow rather than outside investment.
Can an LTV to CAC ratio be too high?
Yes. A very high ratio such as 8:1 can mean you are underinvesting in growth. You may be able to afford more acquisition spend per customer, capture more market share, and still stay above the 3:1 threshold.
MerchSites tools and guides are written and reviewed by ecommerce practitioners. Calculations are cent-accurate estimations based on reported platform fees and standard formula math.