Why This Ratio Matters
LTV tells you what a customer is worth; CAC tells you what they cost to acquire. Neither number means much on its own — the ratio between them is what actually shows whether acquisition spend is sustainable. Investors and operators both watch this ratio as a headline unit-economics health check.
A ratio below 1:1 means losing money on every customer before even accounting for other operating costs; a ratio around 3:1 or higher is commonly treated as a healthy target, though the right number varies by business model and growth stage.
LTV:CAC Ratio Formula
Divide customer lifetime value by customer acquisition cost.
LTV:CAC Ratio = LTV ÷ CAC
Worked Example
A customer has an estimated $1,200 lifetime value and cost $300 to acquire.
LTV:CAC Ratio = $1,200 ÷ $300 = 4x
What Moves This Ratio?
- Retention — longer customer lifespans raise LTV without changing acquisition cost at all.
- Acquisition efficiency — lowering CAC through better targeting or conversion rate directly improves the ratio.
- Average order value and frequency — both feed into LTV and move the ratio alongside it.
- Payback period — not captured by the ratio itself, but worth tracking alongside it, since a good ratio achieved over too long a payback window can still strain cash flow.
LTV:CAC Ratio Calculator FAQ
How is the LTV:CAC ratio calculated?
Divide customer lifetime value by customer acquisition cost: LTV:CAC Ratio = LTV ÷ CAC. A ratio of 3 (often written 3:1) means a customer is worth three times what it cost to acquire them.
What's a good LTV:CAC ratio?
A commonly cited rule of thumb targets at least 3:1 for a healthy, sustainable business. Below 1:1 means losing money on every customer; a very high ratio (10:1+) can actually suggest under-investing in growth rather than being purely good news.
Does a high LTV:CAC ratio always mean a healthy business?
Not necessarily — it ignores payback period (how long it takes to recoup CAC) and total growth rate. A business with an excellent ratio but very slow customer acquisition may still struggle to grow fast enough to matter.
How do I calculate LTV and CAC to use here?
Use the dedicated LTV calculator to estimate customer lifetime value from order value, frequency, and lifespan, and the CAC calculator to measure acquisition cost from spend and new customers — then plug both results in here.