Repeat purchase rate: the number that predicts whether you compound

Aug 18
3 min read

Updated: 3 days ago

Introduction

Repeat purchase rate is the share of your customers who buy more than once. It is the simplest indicator of whether your business compounds or has to keep buying growth.

A business with a high rate gets more valuable every month at no additional acquisition cost. One with a low rate is on a treadmill, replacing customers as fast as it wins them.

1. How to calculate repeat purchase rate

Repeat purchase rate = customers who bought more than once ÷ total customers

Over a defined period, and counting unique customers rather than orders.

Choose a period long enough to allow a second purchase. If your customers typically buy every two months, measuring over a single month will suggest almost nobody returns. Match the window to your actual purchase cycle.

2. Calculate it by cohort, not in aggregate

An aggregate figure across all customers mixes people who have had years to return with people who bought last week.

Group customers by the month they first bought, then track what proportion of each group returned within a fixed number of days. Now the comparison is fair, and you can see whether recent cohorts behave better or worse than older ones.

That trend is far more informative than the overall number, because it tells you whether changes you made are working.

3. What a healthy figure looks like

There is no universal benchmark, and any article offering one is describing a different business. What matters is your own trend and your own model.

The useful comparison is structural: businesses selling consumables or services with a natural rhythm should expect a high rate, and a low one indicates a real problem. Businesses selling infrequent, considered purchases will have a low rate by nature, and should be judged on referrals and lifetime value instead.

Know which you are before deciding whether your number is a problem.

4. Watch the second-purchase step specifically

The largest drop is almost always between the first and second purchase. Customers who buy twice are dramatically more likely to buy a third time.

So the single most valuable intervention is whatever moves someone from one purchase to two. That is where follow-up, entry offers and onboarding effort earn the most.

Measure that step separately. Improving it lifts everything downstream.

5. The three levers that move it

A reason to return, with a date. Satisfaction alone does not produce a second purchase. Something new, a rebooking, a benefit that accrues.

Timely follow-up. One useful message after the first purchase, sent while the customer still remembers you, outperforms an elaborate sequence sent later.

A good first experience. Most repeat behaviour is decided at the first transaction. If that was merely acceptable, no follow-up rescues it.

None of these require software, and all of them require someone to own the routine.

6. Use the gap between purchases to time your effort

Alongside the rate, calculate the typical gap between purchases. That figure tells you when a customer is drifting.

If your typical gap is five weeks, someone at eight weeks is late, and that is the moment to reach out — not at an arbitrary monthly interval. Acting on the gap rather than the calendar makes the same effort considerably more effective.

7. Do not buy repeats with discounts

A discount that produces a second purchase at poor margin has bought a number rather than a customer.

Worse, it teaches people to wait for offers, which lowers the value of every subsequent purchase. Where you can, give a reason to return that costs you little — access, timing, something new — rather than a price reduction.

Conclusion

Calculate repeat purchase rate by cohort over a window that matches your purchase cycle, and watch the first-to-second step most closely.

Judge your figure against your own trend and your business model rather than a benchmark, use the typical gap between purchases to time your follow-up, and avoid buying repeats with discounts. It is the cheapest growth available, because these customers cost nothing to acquire again.