Amazon Marketing Cloud tool

Audience Size Checker

Enter the estimated number of user IDs and the tool shows whether the minimum size according to the Amazon documentation is reached.

For example from COUNT(DISTINCT user_id) in a preliminary query.
Projection (optional) Linear upper bound: unique users grow more slowly than linearly with the period.

Enter a user count to see the result.

Source: Amazon Ads API, Rule-based audiences and Rule-based lookalike audiences (retrieved 2026-10-09).

The calculation runs in your browser. No input is transmitted.

How the tool calculates

Limits according to Amazon

  • Rule-based audiences: at least 2,000 user IDs, target 2,500 or more to avoid failure.
  • Lookalike seed: at least 500 and at most 500,000 user IDs.
  • At 2,000 identities opt-outs are screened out; the audience should therefore be larger than 2,000.