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Resting energy (Mifflin-St Jeor), digestion (about 10% of food, or by protein/carbs/fat), everyday movement (your job, waking hours and steps) and exercise (2024 Compendium of Physical Activities). Tap any number on the Out tab to see its formula with your figures. After about a week of weigh-ins and complete food days, your weight trend corrects the estimate.

It needs at least 5 morning weigh-ins, 5 complete food days, and 7 days between the first and last weigh-in. Open the chart button on the Out tab to see what's still missing.

Tell it ("it was a small one", "no sugar") and it corrects the meal — or open the meal on the In tab and change the grams.

Settings → AI coach. Everything else works without it.

Check iPhone Settings → Health → Data Access & Devices → Out Calories, and that reading steps, weight and workouts is allowed. Then open the app.

Settings → Coach nudges: choose which kinds, quiet hours, and the maximum per day. Also check iPhone Settings → Notifications → Out Calories.

Touch and hold the home screen or lock screen, tap Edit / +, and search for Out Calories. There are Today, Calories left and Fasting widgets.

Settings → Delete all my data. It's all on your iPhone, so this removes it completely. Deleting the app does too.