How are MTUs calculated by Segment?

MTUs are Monthly Tracked Users

We calculate this by adding the number unique userIdsand number of unique anonymousIds that you track with Segment. We only count users once per month, even if they perform multiple actions across your sources.

What about object-based sources?

Object-based Sources (like Salesforce, Zendesk, and Stripe) don’t impact your MTU counts, because there are no IDs, but they will impact your overall object count.

And event based cloud-app sources?

Event based (mostly email sources like Klaviyo, Vero, Drip, etc.) will create MTUs because they have IDs associated.


If you have any questions, or see anywhere we can improve our documentation, please let us know!