Lifespan is in the same period you measured (e.g. months). Lower churn compounds into higher lifetime value.
Why churn quietly decides your growth
Churn is the rate at which customers stop doing business with you over a period. It is the silent tax on growth: every customer lost is one you must reacquire — at full CAC — just to stand still. Two businesses can win customers at the same rate, and the one with lower churn will pull away, because its customers accumulate rather than leak out the back.
This calculator computes your churn rate from the number of customers you started with and the number you lost in the period, and returns the mirror figure — retention rate — plus the average customer lifespan that churn implies. That last number is the bridge to lifetime value: an average lifespan is roughly one divided by your churn rate, so a 5% monthly churn implies an average customer life of about 20 months. Lower the churn and lifespan (and LTV) rise sharply.
Because retention compounds, small improvements are disproportionately valuable. Cutting monthly churn from 5% to 4% doesn't just save a few customers — it lengthens every customer's lifespan, raises LTV, and lets you afford a higher CAC to grow faster. That is why mature businesses obsess over retention: it is usually cheaper to keep a customer than to win a new one, and its effects multiply.
TriMediaX helps brands cut churn through behavioural insight, lifecycle marketing and better customer experience — turning one-time buyers into repeat revenue. Measure your churn here, then let us help you keep more of what you win.
Frequently asked questions
How do I calculate churn rate?+
Divide the number of customers lost during a period by the number you had at the start, then multiply by 100. Losing 30 of 600 customers is a 5% churn rate.
What is retention rate?+
It's the mirror of churn — the percentage of customers you keep. A 5% churn rate means a 95% retention rate for that period.
How does churn relate to customer lifespan?+
Average lifespan is roughly one divided by the churn rate. A 5% monthly churn implies an average customer life of about 20 months.
Why does a small churn improvement matter?+
Because retention compounds. Cutting churn lengthens every customer's lifespan, raises lifetime value, and lets you afford more to acquire new customers.
Can TriMediaX help reduce churn?+
Yes. We use lifecycle marketing and behavioural insight to improve retention, turning one-time buyers into repeat, higher-value customers.
Marketing, engineered.
TriMediaX turns numbers like these into revenue with data science, neuromarketing and behavioural analysis.