SaaS Customer LTV to CAC Calculator
Estimate gross-profit customer lifetime value and acquisition payback under a constant monthly churn model.
Estimate gross-profit customer lifetime value and acquisition payback under a constant monthly churn model. Example result: gross-profit customer ltv = $1,600.00. Compare your own inputs below. Estimates depend on the stated assumptions and are not a quote or forecast. Defaults are illustrative, not recommendations.
Your result
- Gross-profit customer LTV
- $1,600.00
- LTV to CAC ratio
- 3.2
- Acquisition payback months
- 6.25
- Modeled customer lifetime months
- 20
With the example inputs, gross-profit customer ltv is $1,600.00. A favorable ratio can still hide cash-flow pressure when payback takes too long. Compare cohorts with the same acquisition-cost definition and distinguish customer churn from revenue churn.
How to use this saas customer ltv to cac calculator
- Monthly revenue per customer: enter the amount in your selected currency. The worked example uses $100.00.
- Gross margin: enter a percentage using 5 to mean 5%. The worked example uses 80%.
- Monthly customer churn: enter a percentage using 5 to mean 5%. The worked example uses 5%.
- Customer acquisition cost: enter the amount in your selected currency. The worked example uses $500.00.
Start with figures from the same statement date or planning period. Calculate once, save scenario A, then change one assumption to understand its effect. The comparison shows B minus A; a positive difference means the result increased, which is not automatically better.
Formula and calculation method
Estimated life = 1 / monthly churn; gross-profit LTV = monthly revenue × gross margin / churn; payback = CAC / monthly gross profit.
The calculator evaluates this relationship directly in your browser. The displayed precision is for readability and does not imply a guaranteed outcome. Time periods and rate conventions matter: use the exact units in each input label and avoid mixing monthly and annual values.
What the result means
A favorable ratio can still hide cash-flow pressure when payback takes too long. Compare cohorts with the same acquisition-cost definition and distinguish customer churn from revenue churn.
Two worked examples
1. Illustrative planning scenario
Monthly revenue per customer = $100.00; Gross margin = 80%; Monthly customer churn = 5%; Customer acquisition cost = $500.00.
Apply the stated formula with these inputs. Monetary examples use USD; percentages are divided by 100 inside the calculation. Intermediate calculations retain full precision and displayed amounts are rounded.
| Output | Calculated result |
|---|---|
| Gross-profit customer LTV | $1,600.00 |
| LTV to CAC ratio | 3.2 |
| Acquisition payback months | 6.25 |
| Modeled customer lifetime months | 20 |
2. Simplified calculation check
Monthly revenue per customer = $100.00; Gross margin = 50%; Monthly customer churn = 10%; Customer acquisition cost = $100.00.
Apply the stated formula with these inputs. Monetary examples use USD; percentages are divided by 100 inside the calculation. Intermediate calculations retain full precision and displayed amounts are rounded.
| Output | Calculated result |
|---|---|
| Gross-profit customer LTV | $500.00 |
| LTV to CAC ratio | 5 |
| Acquisition payback months | 2 |
| Modeled customer lifetime months | 10 |
The second example uses simpler inputs to make the arithmetic easier to check. It is also included in the automated regression suite. These examples illustrate the model and are not market averages, live offers or personalized advice.
Assumptions and limitations
Constant churn, stable gross profit, no discounting, expansion or refunds. Early cohorts and very low churn make this simplified lifetime model unstable.
Use this output to frame a question or compare consistent scenarios. Reconcile any decision involving an actual product, employment agreement or financial statement with its underlying documents. If a contract uses different rounding or timing, its result may differ from this estimate.
Frequently asked questions
Can I use annual churn in the monthly churn field?
No. Use a monthly customer churn rate measured on the same cohort and period basis as monthly revenue.
How do I interpret the gross-profit customer ltv result?
A favorable ratio can still hide cash-flow pressure when payback takes too long. Compare cohorts with the same acquisition-cost definition and distinguish customer churn from revenue churn.
What assumptions can change this estimate?
Constant churn, stable gross profit, no discounting, expansion or refunds. Early cohorts and very low churn make this simplified lifetime model unstable.
Can I compare two scenarios without creating an account?
Yes. Save scenario A, change one or more inputs to create scenario B, and compare each result with its difference. Neither scenario requires an account.
Can I use this calculator in another currency?
Yes. Select a display currency and enter every monetary input in that currency. This changes formatting only; it does not convert exchange rates or apply local laws. The static worked examples are in USD.
Sources and verification
The following primary sources provide background on the financial concepts. CalcPane’s formula and assumptions above define this specific model; these organizations do not endorse CalcPane or certify its outputs.
Formula implementation and worked examples checked by automated tests on 2026-10-17. Inspect this calculator’s inputs and expected outputs. Read our calculation methodology. Independent professional review has not been completed for this release.
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Cite this calculator
CalcPane. (2026-10-17). SaaS Customer LTV to CAC Calculator. https://calcpane.com/saas-customer-ltv-cac-calculator/
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