SaaS Customer Lifetime Value Calculator

The standard SaaS formula is (ARPU × Gross Margin) ÷ Monthly Churn Rate. This gives you the expected gross profit per customer if churn and margin stay constant.

The formula assumes a constant churn rate, which is a simplification. Real churn curves often decline over time as you retain your most loyal customers. For expansion-heavy businesses, modeling LTV with cohort revenue data is more accurate than the static formula, which the NRR calculator helps you measure alongside.

Churn is in the denominator of the LTV formula, which means it compounds in both directions. A small improvement has an outsized positive effect; a small deterioration has an outsized negative effect.

Monthly churn of 2% implies an average customer life of 50 months. Monthly churn of 5% implies 20 months, a 60% reduction in lifetime from just a 3-point churn increase. Our guide on how to calculate and reduce churn rate walks through the levers most likely to move the needle, and pairs with retention rate and NPS as leading indicators of LTV decay.

Gross margin keeps LTV focused on what you actually keep after delivering the product, not just what customers pay. A $500 ARPU customer at 40% gross margin contributes $200 per month in gross profit, very different from the same ARPU at 80% gross margin.

Using revenue-based LTV inflates the number and can lead to decisions where you spend more to acquire customers than the economics actually support. The gross-margin-adjusted formula is the one most investors and operators use for unit economics diligence.

A 3:1 ratio is the most-cited SaaS benchmark, meaning a customer generates three dollars of lifetime gross profit for every dollar spent acquiring them. Below 3:1 usually signals that acquisition is too expensive or retention is too weak.

Above 5:1 sometimes signals that you are underinvesting in growth relative to the efficiency of your acquisition engine. The right target also depends on payback period: a 3:1 ratio with a 24-month payback is riskier than one with a 9-month payback, especially in capital-constrained environments.

The calculator applies a 0.5 percentage point churn reduction and shows you the resulting LTV side by side with your current LTV. This sensitivity analysis is intentionally small. 0.5pp is a realistic near-term improvement target. It shows how much value a modest retention program can create before you commit to building it.

At a monthly churn of 4%, reducing to 3.5% increases LTV by roughly 14%, which translates directly into higher payback efficiency and a better LTV:CAC ratio.

Interactive demos help customers reach value faster after purchase, which is the clearest driver of long-term retention. When customers understand what the product can do across all the use cases relevant to their team, they expand usage and are less likely to churn at renewal.

Send reported 50% faster user comprehension after replacing static help documentation with interactive demos. Faster comprehension means faster activation, which means customers reach the point of needing the product sooner. That reduces churn before it starts.

Yes. Supademo's SaaS LTV calculator is completely free to use in your browser with no sign-up required.