Calorie targets get dangerous when “faster results” is the only dial. A weekly pace like −0.5 kg/week is a planning speed. Pushing toward −1 kg/week on a small, sedentary body can drive intake under resting BMR - a crash sketch wearing a calculator’s confidence.
This page’s framing is Pace ≠ crash. You choose a weekly change, the panel maps it to a daily calorie target from maintenance (TDEE), and a BMR floor gate lights up when the target undercuts resting burn. Soft-sounding aggression is still aggression.
That is different from the TDEE calculator’s rest→day bridge and activity ladder, and different from the BMR calculator’s Mifflin vs Harris formula strip. Here the job is goal pace with a safety rail - speed you can live with for months, not a number you can only survive for a week.
Coaches and self-trackers hit the same trap: copying a friend’s deficit while ignoring body size, activity, and the floor. Naming pace first - then checking the gate - is the literacy skill.
“I only cut 500 calories” sounds universal until a small sedentary BMR meets a large deficit. Absolute deficits without a floor check are how crash plans get laundered as math.
Decision framing: “What weekly pace am I willing to sustain without under-fueling rest?” - not “what is the lowest calorie number that still looks like a plan?”