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The ARPU boundary worksheet
The same revenue can produce different ARPU values when eligible users or cohort boundaries change.
| Metric object | Numerator under named metric | User denominator | Period or cohort | Synthetic arithmetic | What it cannot answer |
|---|---|---|---|---|---|
| All-user ARPU | EUR 48,000 net recurring revenue | 1,000 eligible users | One declared month | EUR 48,000 / 1,000 = EUR 48 | Whether users are profitable or retained |
| Paying-user ARPU | EUR 48,000 net recurring revenue | 600 eligible paying users | Same month, narrower denominator | EUR 48,000 / 600 = EUR 80 | Whether eligibility changed the comparison |
| Cohort A ARPU | EUR 24,000 net recurring revenue | 400 users in Cohort A | Same month, fixed entry event | EUR 24,000 / 400 = EUR 60 | Why Cohort A has a different mix |
| Cohort B ARPU | EUR 24,000 net recurring revenue | 600 users in Cohort B | Same month, fixed entry event | EUR 24,000 / 600 = EUR 40 | Whether age or acquisition route caused the gap |
| Cross-buying line | EUR 8,000 additional product revenue | 1,000 eligible users | Same month and base population | EUR 8,000 / 1,000 = EUR 8 | Whether the line increased contribution or retention |
| Contribution per eligible user, not ARPU | EUR 30,000 contribution after declared costs | 1,000 eligible users | Same month and base population | EUR 30,000 / 1,000 = EUR 30 contribution per eligible user | Whether it can be compared with ARPU or whether the cost boundary is complete |
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Reference & Evidence
Source: Author's synthetic ARPU worksheet grounded in Kumar, George, and Pancras (2008) and Kamakura (2008). Revenue, user counts, and ratios are illustrative arithmetic, not company data or benchmarks.
Each line is a claim from the register this journal publishes against, resolved from the register at build time.
- B Kumar, George, and Pancras describe cross-buying as a way existing customers can contribute revenue across products and study drivers and consequences in a retail setting: "cross-buying by consumers enables retailers to cross-sell their products and increase revenue contribution from existing customers" Kumar et al. (2008), full-text extract held ·
KGP08-C1 - B Their cross-buying result is a retail customer-behaviour study, not a universal ARPU benchmark or a general SaaS growth law: "for studying the drivers of cross-buy in a non-contractual setting, we define cross-buy as the total number of different product categories that a customer has purchased from a firm from the time of first purchase" Kumar et al. (2008), full-text extract held ·
KGP08-C2 - B Kamakura frames cross-selling as offering an additional product to the right customer and links the strategy to share of wallet, relationship breadth, and retention questions: "increasing the firm’s share of the customer wallet, broadening the scope of the relationship with the customer, and increasing customer retention" Kamakura (2008), full-text extract held ·
KAM08-C1 - B Analytical targeting can identify cross-selling prospects, but a prospect score is not the same object as realised revenue per user: "a review of some of the analytical tools for identifying prospects for cross-selling" Kamakura (2008), full-text extract held ·
KAM08-C2 - B ARPU is revenue under a declared numerator boundary divided by eligible users under a declared denominator boundary for a named period or cohort Author metric definition ·
G10ARPU-OWN-C1 - B A usable ARPU record states whether revenue is gross, net, invoiced, collected, recurring, or another defined amount and which users are eligible Author metric framework ·
G10ARPU-OWN-C2 - B ARPU can describe average monetization under a stable boundary, but it does not by itself measure customer value, margin, retention, or causal product performance Author negative boundary ·
G10ARPU-OWN-C3 - B Cohort entry, plan mix, geography, acquisition route, user definition, and maturity can change ARPU without a change in the underlying offer Author measurement framework ·
G10ARPU-OWN-C4 - B Cross-buying and cross-selling are behaviour and offer objects that can contribute to ARPU, but neither is interchangeable with the ratio Author taxonomy ·
G10ARPU-OWN-C5 - B ARPU should be read beside the eligible-user count, revenue bridge, contribution boundary, and cohort composition rather than as a standalone target Author operating framework ·
G10ARPU-OWN-C6 - B The ARPU comparison table is synthetic and illustrative; its values are arithmetic examples, not company data or benchmarks Author synthetic object ·
G10ARPU-OWN-C7 - B A change in ARPU after a definition, pricing, mix, or eligibility change is descriptive until the changed mechanism and comparison window are declared Author causal boundary ·
G10ARPU-OWN-C8
Grades: A, verified against the printed page of the primary source · B, primary source, text layer only · C, authoritative secondary · D, reported.
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