Business & SaaS
LTV:CAC Ratio Calculator
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How to use it
Using the ltv:cac ratio calculator
- 01
Enter LTV
Use the gross-profit version from the CLV calculator, not revenue.
- 02
Enter CAC
Fully loaded acquisition cost for the same period or channel.
- 03
Read the verdict
The interpretation row compares your ratio against the 3:1 benchmark and its upper bound.
Good to know
Reading both directions of the ratio
Below 3:1, every growth dollar buys relationships that barely repay themselves; fix retention, pricing or targeting before scaling. Above roughly 5:1, the opposite problem looms: markets willing to pay far more than you spend suggest competitors will happily spend more to serve them. Healthy growth lives in the middle, then pushes outward deliberately.
Companion metrics
- CAC payback months; how quickly each customer repays their cost.
- Gross margin; inflates LTV and therefore the ratio; keep definitions consistent.
- Retention/churn; the single biggest driver of LTV over time.
How it's calculated
The math behind this calculator
Ratio = LTV / CAC (benchmark ≥ 3:1)The ratio divides the gross profit an average customer generates by what it cost to acquire them. Below 1:1 you lose money on every sale immediately. The widely cited SaaS benchmark of 3:1 leaves room for overhead, churn surprises and capital cost, while ratios far above 5:1 often signal a company too conservative with growth spending.
Assumptions & limitations
- LTV is measured in gross profit, not revenue.
- CAC is fully loaded (salaries, tools, agencies) and matched to the same cohort.
- Static snapshot; cohorts and ratios shift as pricing and channels mature.
Worked example
Customers worth $3,600 in lifetime gross profit who cost $1,200 to acquire yield a 3:1 ratio; right at the healthy benchmark.
FAQ
Frequently asked questions
- Is 3:1 a hard rule?
- It is a heuristic, strongest for subscription businesses. Enterprise sales cycles tolerate longer paybacks; transactional e-commerce often needs higher ratios because repeat behavior is less certain.
- My ratio is 8:1; should I celebrate?
- Partly. It means excellent unit economics but possibly underinvestment: if demand holds, spending more on acquisition at even 4:1 returns compounds faster.
- Can I compute this per channel?
- Yes and you should; divide each channel’s attributed LTV by its fully loaded CAC. Blended ratios hide that one channel subsidizes another’s losses.
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