Customer churn is the rate of customers who leave a business over a period of time — not repurchasing, not renewing, not returning. For businesses with returning customers (F&B, retail, scheduling services), high churn is a dangerous sign: you have to spend money constantly finding new customers to replace them. Reducing churn starts with proper measurement and finding the reason customers leave — usually a broken experience, lack of care, or a better competitor. Zenify recorded a 37% increase in churn and repeat purchases (approved).
TL;DR
- Churn = customer churn rate during the period.
- Formula: churn = customers lost during the period / customers at the beginning of the period.
- High churn = waste of money to find new customers to replace.
- Cause: broken experience, lack of care, being manipulated by competitors.
- Reduce churn: measure, ask the reason, fix the root, take proactive care.
What is customer churn?
Customer churn measures the percentage of customers who do not return within a period. Applies to:
Scheduling service: customers do not rebook.
Retail: customers do not buy for X months.
Registration/service: customer does not renew or cancel.
Why it's important: Every customer that leaves is lost revenue + the cost of finding a new customer to replace. Keeping old customers is much cheaper than acquiring new customers (see Cost of new customers vs retaining old customers).
How to calculate churn
Basic formula:
Churn rate = (Customers lost during the period) / (Customers at the beginning of the period) × 100%
For example: at the beginning of the month there were 200 active customers. At the end of the month there were 170 guests. (New guests are not included in this formula.)
Churn = (200 − 170) / 200 = 15%
Lưu ý:
Clearly define what a "lost customer" is: not buying for X months? Cancel? No renewal?
Measure monthly to see trends.
Separation of groups: new customer churn vs old customer churn — different causes.
Why customers leave
1. Broken experience
Asked questions that were not answered, had to wait for a long time, were bullied into changing the channel.
74% of customers switch channels/competitors after a bad experience (reviewed source).
2. No care
After purchasing, it "disappears" — no one asks, no one updates the order.
Customers don't feel appreciated → look elsewhere.
3. Đối thủ tốt hơn
Better price, better experience, better care.
You can only keep customers when your experience is better or equivalent.
4. Needs change
It's not your fault — but ask to find out (and keep in touch for next time).
5 ways to reduce churn
1. Measure churn properly and track monthly
Know how much churn is, whether increasing or decreasing — no "guessing".
Separate by group of guests to find the group leaving the most.
2. Ask the guest why he left
Churn survey: "Why don't you come back?"
The real reason → fix it completely (see Survey design).
3. Proactive care
Message after purchase, update order, ask after receiving goods (see After-sale care message).
Customers are cared for and come back more.
4. Handle complaints quickly and properly
Customer complaints are handled well → more loyal than before.
Customers complain about being ignored → leave and say bad things.
5. Group channels to not "abandon" customers
Customers who ask about any channel get an answer — there is no dormant news (see Multi-channel unification).
General customer profile helps identify "about to leave" customers (not buying for a long time) to proactively retain.