What is purchase frequency?

The average number of purchases a customer makes within a given time period.

How is purchase frequency calculated?

Total orders divided by unique customers over the period — 1,800 orders from 1,000 customers is a frequency of 1.8.

Why does purchase frequency matter?

It's one of the three levers of lifetime value (with order value and lifespan), so raising it directly increases what each customer is worth.

Growth Marketing Glossary

Purchase Frequency

noun

How often each customer buys — one of the three levers, with order value and lifespan, that multiply into lifetime value.

Schematic — purchases across a period

Term: Purchase Frequency
Part of speech: Noun
Field: Ecommerce / Retention
Formula: Orders ÷ unique customers

Forms & parts of speech

purchase frequency · noun

Average buys per customer.

"Raising purchase frequency with replenishment reminders lifted lifetime value."

Definition in plain terms

Purchase frequency is the average number of times a customer buys within a defined period — say, a year. If 1,000 customers placed 1,800 orders in a year, average purchase frequency is 1.8. It captures how often, not just whether, customers buy, and it's a key driver of how much each customer is worth.

The mechanics

The formula is total orders ÷ unique customers over the period. Purchase frequency is one of the three levers of customer lifetime value, alongside average order value and customer lifespan — LTV rises when any of them rises. You increase frequency through replenishment reminders, subscriptions, lifecycle email, loyalty programs, and expanding the range a customer buys across (cross-selling).

When it matters

Purchase frequency matters for understanding and growing customer value, especially for consumable or replenishable products where buying more often is natural. It pairs with average order value and repeat purchase rate to diagnose where value comes from. The nuance: frequency is bounded by the product's natural cadence — pushing people to buy durable goods more often than they need backfires; the lever to pull depends on the category.

Worked example. A skincare brand finds customers buy on average twice a year, but the product lasts about two months — they're forgetting to reorder. Adding replenishment reminders and a subscribe option raises purchase frequency from 2 to 4 a year. Because frequency is a direct multiplier of lifetime value, that change alone roughly doubles each customer's worth without acquiring anyone new.

Failure modes to watch. Pushing frequency beyond the product's natural cadence (annoying customers); optimizing frequency while order value or retention slip; ignoring it in LTV math; and measuring over a window that doesn't fit the buying cycle.

Synonyms & antonyms

Synonyms

purchase frequencyorder frequencybuying frequency

Antonyms

one-time purchaseinfrequent buyer

Usage trends

Search interest for this term over the last five years:

View interest-over-time on Google Trends →

Common questions

What is purchase frequency?: The average number of purchases a customer makes within a given time period.
How is purchase frequency calculated?: Total orders divided by unique customers over the period — 1,800 orders from 1,000 customers is a frequency of 1.8.
Why does purchase frequency matter?: It's one of the three levers of lifetime value (with order value and lifespan), so raising it directly increases what each customer is worth.

Related tools & calculators

toolLTV calculator

Resources & people to follow

bookLean Analytics — Croll & Yoskovitz
referenceShopify — customer value research
thought leaderPeter Fader — customer-centricity

Curated, non-competitor resources verified per term.

Related training

moduleSubscription growth

Disciplines

Areas of marketing where purchase frequency is a core concern:

Retention / CRMEcommerce analytics

Sources

trendsGoogle Trends — "purchase frequency"