LTV to CAC Ratio & Payback Period Calculator
Calculate LTV:CAC ratio and payback period in months, then check both against commonly cited SaaS health benchmarks.
4.67:1 LTV:CAC
Healthy — in the commonly cited sustainable range
| Metric | Value |
|---|---|
| LTV | $1400.00 |
| Ratio | 4.67:1 |
| Monthly gross profit per account | $23.33 |
| Payback period (months) | 12.9 |
| Health band | healthy |
Why a healthy ratio can still mean a cash-flow problem
LTV:CAC is a sustainability check on the math, not a statement about whether a business can survive long enough for that math to pay off — a 5:1 ratio with a 24-month payback period requires two full years of runway per new customer cohort before that ratio's value is actually realized in cash. This tool always reports payback period alongside the ratio specifically because the ratio alone can look reassuring while the cash-flow reality is tight.
Why churn rate has outsized leverage over the whole calculation
LTV divides annual gross profit per account directly by churn rate, so cutting annual churn from 20% to 10% doubles LTV outright, all else equal — customers now stick around roughly twice as long on average. Retention improvements compound into lifetime value far more directly than most acquisition-side optimizations, which is a large part of why reducing churn is usually the single highest-leverage lever in this formula.
Why the benchmark bands aren't universal targets
3:1 is a widely cited SaaS/subscription health benchmark, not a rule every business must hit — a capital-efficient business with very low CAC might run well above 5:1 deliberately without being under-invested, and an early-stage company intentionally buying market share might run below 3:1 for a defined period with a clear plan to improve it. Treat the bands as a sanity check against your specific business model, not a pass/fail grade.
How to use this calculator
- Enter average order value, purchase frequency and gross margin.
- Enter annual churn rate and CAC.
- See LTV, the LTV:CAC ratio, payback period and health band.
- Churn rate is annualized
- LTV = (average order value x purchase frequency per year x gross margin%) ÷ annual churn rate — enter your churn rate on the same annual basis as your purchase frequency.
- Health bands are general commonly cited benchmarks
- The below-1, 3, and 5 thresholds are widely cited SaaS/subscription rules of thumb, not universal targets — capital-intensive or early-stage businesses often run outside them deliberately.
Questions
My ratio looks healthy but I'm still burning cash — what am I missing?
A healthy LTV:CAC ratio only tells you the math works out eventually — it says nothing about whether you have enough cash on hand to survive until it does. A 5:1 ratio with a 24-month payback period requires two years of runway per cohort of new customers before that ratio's value is actually realized in cash, which is why this tool always reports payback period alongside the ratio.
Why does churn rate have such an outsized effect on LTV?
Because LTV divides by churn rate directly — cutting annual churn from 20% to 10% doubles LTV outright, all else equal, since customers now stick around roughly twice as long on average. Retention improvements compound into LTV far more directly than most acquisition-side optimizations, which is a big part of why reducing churn is usually the highest-leverage lever in this formula.
Should every business aim for exactly 3:1?
3:1 is a widely cited SaaS/subscription benchmark, not a universal target — a capital-efficient business with very low CAC might run well above it deliberately, while an early-stage company intentionally buying market share might run below it for a defined period with a clear plan to improve. Treat the benchmark as a sanity check, not a rule every business must hit.
Does this account for the time value of money?
No — this is a straightforward gross-profit-based LTV calculation, not a discounted-cash-flow model. For a rough planning estimate this level of precision is usually sufficient, but a rigorous LTV model for capital-allocation decisions would discount future cash flows rather than treating a dollar next year the same as a dollar today.