I am wondering who determines the burn estimate?

Do the trainers determine that themselves or is there a special formula?

Because it seems to me that for instance the burn estimates of Patrice's workouts are rather high compared to the burn estimate of Tasha's workouts for instance.

Sometimes higher intensity and longer workouts of Tasha have a lower burn estimate than workouts of Patrice which are shorter and have a slightly lower intensity.

Has anyone else noticed this as well, or is it just me? 😊🤔