What you burn doing nothing, what you burn on a normal day, and what to eat to lose.
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Every TDEE number is an estimate, including this one. Mifflin–St Jeor is a population average fitted to height, weight, age and sex, so it can't see your muscle mass, your thyroid, your medication or how much you fidget, and individuals land roughly ±10% either side of it routinely. Treat it as a starting point to test against the scale over a few weeks, not a measurement. It is not medical or dietary advice, and if you're on a GLP-1 your calorie target is a conversation to have with your prescriber.
BMR is roughly what you would burn resting all day. TDEE adds your normal daily activity on top, so it is about what you could eat to stay the same weight.
The Mifflin-St Jeor equation, a widely used estimate from your sex, age, height and weight.
No. Whatever pace you pick, it never suggests a target below a set floor.
Your BMR drops every pound you lose, so a TDEE you worked out in month one is quietly wrong by month four. Tirzing recalculates it off your latest weigh-in and sets it against what you actually ate and burned that day: food diary, workouts, energy balance, all in one place.