Q: Does Apple Watch monitor daily calories as well as Garmin Forerunner

Hi

Apple Watch measures your active calories throughout the day via the built-in Activity app. This information - along with total calories - is also recorded in the companion Activity app on the paired iPhone.

Calories are measured both during general daily wear and during any workouts.

More information:

Use the Activity app on your Apple Watch - Apple Support

Work out with your Apple Watch - Apple Support

When recording workouts using the built-in Workout app, heart rate is taken into account for estimations of Active calories, including tailored calculations for the preset activity types.

During general daily wear, background heart rate readings are taken when you are still.

More information:

Work out with your Apple Watch - Apple Support

Your heart rate. What it means, and where on Apple Watch you’ll find it. - Apple Support