The formula is simple enough to do on a napkin, and it explains why the back end of a coaching business is worth more than the front. If a client pays every month and leaves with probability c each month, the expected number of months they stay is 1 divided by c. Hormozi's Acquisition.com retention playbook uses exactly this arithmetic: taking churn from 10% to 3% turns a 10-month customer into a 33-month customer, a 3.3x lift in lifetime value with no change to price or product.
| Monthly churn | Average lifetime | Still active after 12 months | Lifetime value at $1,000/mo | Lifetime value at $3,000/mo |
|---|---|---|---|---|
| 20% | 5 months | 7% | $5,000 | $15,000 |
| 15% | 6.7 months | 14% | $6,700 | $20,000 |
| 10% | 10 months | 28% | $10,000 | $30,000 |
| 5% | 20 months | 54% | $20,000 | $60,000 |
| 3% | 33 months | 69% | $33,000 | $100,000 |
| 2% | 50 months | 78% | $50,000 | $150,000 |
Lifetime is 1 divided by churn. Twelve-month survival is (1 minus churn) to the power of 12. Lifetime value is lifetime times monthly price. The table is arithmetic, not a benchmark, and it ignores the revenue from resells and referrals that a longer-staying client also brings, so it understates the real gap.
What does churn do to acquisition cost?
Say it costs $2,000 in ads and sales commission to sign a client at $1,000 a month. At 10% churn that client is worth $10,000, a 5:1 return. At 20% churn, which is common in month one of a poorly onboarded program, the same client is worth $5,000, or 2.5:1, and after refunds and delivery cost the business is treading water. At 3% churn the return is 16.5:1 on the same $2,000. The ad account did not change. The onboarding did.
This is the trap of scaling acquisition first. Doubling ad spend at 15% churn doubles a leak. In Hormozi's phrase from the Gym Launch days, you will never be able to fill a leaky pool. Fixing churn first means every subsequent acquisition dollar compounds instead of draining.
Why does a small retention gain produce a large profit gain?
Because acquisition cost is paid once and delivery cost falls per client over time. Bain's Fred Reichheld put it this way for financial services: a 5% increase in customer retention produces more than a 25% increase in profit, because returning customers buy more, cost less to serve, and refer others. Coaching has the same shape. A client in month 18 costs a fraction of a client in month one to look after, and is the one who gives the testimonial, buys the next program and brings a friend.
What the math looks like in a real program
At Video Business Academy, client lifetime value went from about $4,000 to over $50,000 as the back end was rebuilt around results tracking, client success and resells. Average retention is now two to three years and more than 30% of revenue comes from renewals and resells rather than new sales. At Acquisition Ace, upsells and resells added more than $1 million in six to eight months to a program that was already running. The front end of both businesses was largely unchanged. The lifetime value moved because churn moved.
Results depend on the program, the price point and where retention started. The figures above are from named engagements (Acquisition Ace, Video Business Academy), not a guarantee. Diego also builds Ben Kelly's website, which is a material connection. How we handle claims.
How to use this number
- Calculate your blended monthly churn from the last six months: clients lost divided by clients at the start, averaged.
- Calculate it again for month one only, and for months four onwards. They will be very different numbers.
- Put both through the table above at your price. The gap between the two rows is the money sitting in onboarding.
- Set one target: month-one churn under 10% within a quarter. Everything in the retention cluster of this playbook is how.
