LTV CAC Ratio Calculator
Calculate LTV to CAC ratio using ARPU, gross margin, churn, and acquisition cost, then interpret what the result means.
LTV CAC Ratio Calculator
An LTV CAC Ratio Calculator helps you compare customer lifetime value with customer acquisition cost. That is useful for SaaS founders, growth teams, finance leads, and operators who need to know whether paid growth is sustainable.
The result matters because fast revenue growth can still hide weak unit economics. If you overpay to acquire customers or overstate lifetime value, scaling gets more expensive instead of stronger.
How to Use the LTV CAC Ratio Calculator
- Enter average revenue per account or customer.
- Add gross margin if the calculator uses gross-profit LTV.
- Enter customer lifetime directly, or derive it from churn if supported.
- Add customer acquisition cost using the same cohort logic you use in reporting.
- Review the LTV figure, CAC figure, and final ratio.
- Recalculate after changing churn, margin, or CAC assumptions.
What the LTV CAC Ratio Measures
| Input | What it means | Example |
|---|---|---|
| Average revenue per account | Revenue from one customer in a month | USD 320 |
| Gross margin | Revenue left after direct service costs | 80% |
| Customer lifetime | Expected active duration | 25 months |
| Customer acquisition cost | Sales and marketing cost per customer | USD 1,800 |
LTV CAC Ratio Formula
LTV = Average revenue per account x Gross margin x Customer lifetime
LTV CAC ratio = LTV / CAC
Customer lifetime (months) = 1 / Monthly churn rate
Example LTV CAC Ratio Calculation
Suppose a SaaS company has USD 320 in average monthly revenue per account, 80% gross margin, 4% monthly churn, and USD 1,800 CAC.
Customer lifetime = 1 / 0.04 = 25 months
LTV = 320 x 0.80 x 25 = USD 6,400
LTV CAC ratio = 6,400 / 1,800 = 3.56
How to Interpret the Ratio
- Below
1.0usually means acquisition is destroying value. - Around
1.0to3.0can indicate fragile or improving economics. - Around
3.0or above is often healthier, but not a universal benchmark. - A very high ratio can also mean the business is underinvesting in growth.
Inputs That Change the Result
- Churn rate
- Gross margin
- Fully loaded CAC
- Customer segmentation
Common LTV CAC Mistakes
- Using revenue LTV when gross-margin LTV is more realistic
- Mixing periods across CAC and revenue inputs
- Using unstable churn assumptions
- Treating all customer segments as one blended cohort
To connect this result with adjacent SaaS metrics, compare it with a Churn Impact Calculator or a Trial Conversion Calculator.
FAQ
What is a good LTV CAC ratio?
Many SaaS teams view something near or above 3 as healthier, but acceptable ranges depend on margin, payback, and growth strategy.
Should I use gross margin in LTV?
Usually yes, because gross-margin LTV reflects the cost to serve customers.
Can I calculate lifetime from churn?
Yes, if churn is reasonably stable and you treat it as an estimate rather than a guarantee.
Why can a high ratio still be misleading?
It can hide underinvestment in growth, weak cash payback, or blended data that masks bad cohorts.
Should CAC include sales salaries and tools?
If you want a true acquisition-cost view, it normally should include the real costs required to win customers.