Standard TDEE (Mifflin-St Jeor) with a deficit picker, protein floor, and the two things generic calculators get wrong for people on a GLP-1: the medication already creates the deficit, and under-eating protein is the real risk.
You probably don't need to count calories to lose. The drug cuts intake by roughly 20–35% on its own; trial participants lost 15–21% without a prescribed calorie target. Counting is useful for two things: making sure you're not under the floor, and making sure protein is hit.
The floor matters more than the ceiling. Below about 1,200 kcal (women) or 1,500 kcal (men) for weeks at a time, without medical supervision, you lose muscle, hair and mood before you lose more fat. If your appetite is putting you under that, the fix is protein and fluid, not willpower.
Protein first, then whatever fits. 1.2–1.6 g/kg/day, split into 3–4 hits of 25–40 g. Fibre 25–30 g. The rest is preference.
Weigh weekly, not daily. Water swings on a GLP-1 are big. Compare to the trial curve, not to yesterday.