MyFitnessPal has four activity levels in their app:

Sedentary:. Appropriate for: Those who work at a desk job AND are sedentary at home, with light or no exercise and low LBM (lean body mass – how much muscle you have); Usually NOT appropriate for stay-at-home moms/dads with young children.

Lightly Active: Appropriate for: Most people with young children, who are otherwise sedentary; Many who have a desk job but exercise moderately and have a moderate LBM%; Those who stand a lot at work, but don’t really walk around a lot or lift heavy items, etc.

Active: Appropriate for those who have an active job (some nurses, waitresses, laborers, etc) and exercise moderately-frequently, and especially those who have a high LBM%.

Very Active: Appropriate for those who have a very active job (trainers, some laborers, some athletes, some warehouse workers), and exercise frequently and have a high or very high LBM%.

What's your activity level? I think I'm Lightly Active during the week, and Active on the weekend!