What's my activity level? How do i find my activity level for TDEE calculator?

There's the problem with how TDEE calculators classify activity levels. The categories are far too vague: "sedentary," "lightly active," "very active." What do those even mean? A person who walks and works a physical job for 10 hours a day might end up in the same bucket as someone who just exercises for one hour. Beyond the vague labels, these calculators use fixed multipliers on your base metabolic rate, assuming a consistent increase in energy needs that doesn't reflect the real world.

Why not use a TDEE calculator which doesn't require "how active am i" question?

see this accurate Maintenance Calorie Tracking Guide.