📈 Analytics & Metrics

Purchase Frequency

purchase frequency · order frequency · buying frequency · frequency · average purchase frequency · purchases per customer

Definition

Purchase frequency is the average number of purchases per active customer over a defined period; it is used in RFM analysis and in the LTV calculation.

What purchase frequency is and how to compute it

Purchase frequency is the average number of orders per customer over a period:

Frequency = Total orders in the period / Unique customers in the period

Example: 8,000 orders / 4,000 customers = 2.0 orders per quarter

Important qualifications:
– Count only customers (anyone who has bought at least once), not all visitors
– The period must be the same in the numerator and the denominator
– For a growing business, compare cohorts (by first-purchase date) rather than quarter against quarter

Reference points by vertical

Vertical	Frequency per month	Frequency per year
Grocery e-commerce	3–6	36–70
FMCG / pharmacy	1–3	12–36
Fashion	0.3–0.7	3–8
Electronics	0.1–0.3	1–3
DIY	0.2–0.5	2–6

Purchase frequency inside the LTV formula

Frequency is one of the three multipliers in LTV:

LTV = AOV × Frequency × Lifespan

At an AOV of $250, a frequency of 2.0 per year and a lifespan of 3 years:
LTV = 250 × 2.0 × 3 = $1,500

If frequency rises to 3.0:
LTV = 250 × 3.0 × 3 = $2,250 (+50%)

That explains why investment in retention is disproportionately effective: raising purchase frequency
multiplies the revenue from every acquired customer across their entire lifetime.

How to move purchase frequency

Personalization and recommendations: reminding a customer of products from their preferred
categories at the right moment — when the typical gap between orders for that segment has elapsed.

Triggered communication: automated campaigns based on behaviour — “you bought cat food three
weeks ago, time to restock”.

Points schemes with expiring balances: an expiry date creates urgency and pulls the customer
towards the next purchase before the deadline.

Subscription mechanics: scheduled delivery of FMCG items — guaranteed frequency without marketing
effort behind every individual order.

Tip: do not try to raise frequency uniformly across everyone — the cost will exceed the effect.
Segment by RFM: work on frequency with “Champions” and “Loyal Customers” (already engaged),
activate “Potential Loyalists” (one or two purchases so far), and do not spend budget on “Lost
Customers” (no activity for more than 12 months).

Frequently asked questions

How do you calculate purchase frequency?

Frequency = total orders over a period / unique customers over the same period. For example: 5,000 orders in a quarter across 2,000 unique customers → frequency = 2.5. Count only customers, not all visitors, and keep the period identical on both sides.

Which tools increase purchase frequency?

Behaviour-triggered messaging (abandoned cart, viewed without buying), personalized recommendations based on purchase history, points schemes with expiring balances, subscription mechanics, and retention campaigns targeted by RFM segment.

Why does purchase frequency matter more than CAC for a mature business?

As a business scales, the cost of acquiring a new customer rises — auctions overheat and reach narrows. Raising the purchase frequency of the existing base is a more predictable and less expensive lever. At a frequency of 2.0 versus 1.5 (with the same conversion and AOV), revenue from a cohort grows by 33% with no additional acquisition spend.

How does purchase frequency relate to LTV?

LTV = AOV × frequency × lifespan. A rise in frequency multiplies LTV directly — the relationship is linear. If frequency grows from 2 to 3 while AOV and lifespan stay unchanged, LTV rises by 50%.