LTV:CAC Ratio Calculator
Compare customer lifetime value to acquisition cost and see what the ratio means for your business — with benchmarks that vary by industry, stage and margin rather than one universal number.
Written by the CalcBundle Research & Editorial Team · Reviewed by the Quality Review Team · Transparent formulas · results are estimates, not advice. · Updated
LTV : CAC ratio
Enter both LTV and CAC as values greater than zero.
What is the LTV:CAC ratio?
The LTV:CAC ratio compares how much a customer is worth over their lifetime (LTV) to how much it costs to acquire them (CAC). It is one of the clearest signals of whether a business — particularly a startup or SaaS company — has sustainable unit economics.
How to interpret the ratio
- Below 1:1 — you lose money on every customer; economics are negative.
- ~1:1 to 2:1 — tight; little room to cover overheads and grow.
- ~3:1 — often considered healthy in many SaaS/business models.
- 5:1+ — strong economics, but can also mean you are underinvesting in growth.
These are illustrative guides. The “right” ratio depends on your gross margin, how fast you recover CAC (payback period), your growth stage and your industry.
Why benchmarks vary
A high-margin SaaS business with fast payback can thrive at a lower ratio than a low-margin business, because it keeps more of each dollar and recovers cash sooner. Growth- stage companies often deliberately run lower ratios to capture market share. Treat the “right” ratio as a reference point, not a target set in stone.
Example
With an LTV of $1,200 and a CAC of $300, the ratio is 4:1 — each customer returns four times their acquisition cost over their lifetime.
Related metrics
Calculate the inputs first with the LTV calculator and CAC calculator, then check how fast you recover cost with the CAC payback calculator. These feed into startup valuation.
Frequently asked questions
What does the LTV:CAC ratio mean?
It compares the lifetime value of a customer to the cost of acquiring them. A ratio of 4:1 means each customer is worth four times what you spent to acquire them. It's a quick read on whether your unit economics work.
How do you calculate LTV:CAC?
Divide customer lifetime value by customer acquisition cost: LTV:CAC = LTV ÷ CAC. For example, $1,200 LTV ÷ $300 CAC = 4:1.
Is 3:1 the right LTV:CAC ratio?
3:1 is often cited as healthy for many SaaS and subscription businesses, but it is not a universal law. The right ratio depends on your industry, growth stage, gross margin and payback period. A very high ratio can even signal you are underinvesting in growth.
Should I use revenue LTV or gross-profit LTV?
Gross-profit LTV is usually more meaningful because it reflects the money actually available after delivering your product. Enter a gross margin to see the gross-profit LTV:CAC alongside the revenue-based ratio.
Why can a very high LTV:CAC ratio be a warning sign?
It sounds counterintuitive, but a ratio well above 5:1 often means you are underinvesting in growth. If every customer returns far more than they cost, you could almost certainly afford to spend more on acquisition — accepting a lower ratio in exchange for capturing more of the market before competitors do. In fast-moving markets, a founder posting a 10:1 ratio may be leaving enormous growth on the table by being too cautious. A healthy ratio balances profitability against the opportunity cost of slow growth.
How does payback period relate to the LTV:CAC ratio?
They are complementary, and you need both. LTV:CAC tells you whether a customer is ultimately profitable; payback period tells you how long your cash is tied up before you recover the acquisition cost. A business can have a great 5:1 ratio but a two-year payback, which strains cash flow and makes fast growth hard to fund. Reading the ratio alongside payback prevents the trap of celebrating long-run profitability while quietly running out of money in the short run.
How often should I recalculate LTV:CAC?
At least quarterly, and whenever acquisition costs or retention shift noticeably. Both inputs move over time — CAC tends to rise as channels saturate, and LTV changes as your product, pricing and churn evolve. A ratio that looked healthy a year ago can quietly deteriorate as CAC climbs, so treating it as a living metric rather than a one-off calculation is what keeps it useful for steering the business.
Related calculators
CAC
Work out how much it costs to acquire one customer — blended, marketing and sales CAC.
LTV
Estimate a customer's lifetime value from order value, frequency and lifespan — or churn.
CAC Payback Period
See how long it takes to recover CAC from a customer's gross profit.
Startup Valuation
Estimate a startup's indicative value from ARR, revenue, growth and churn.
Disclaimer. This calculator provides estimates for informational purposes only. Results are based on the information you enter and the assumptions used by the calculator. Actual financial, tax, business valuation, lending, marketplace or investment outcomes may differ. Consider consulting a qualified professional for decisions involving significant amounts of money. Benchmarks shown are illustrative, not universal rules. Results are estimates based on the inputs you provide.