Calories on Apple Watch

Resting Calories

Your resting calories per day is the amount of energy (in the form of calories) that your body needs to function while resting. This is also known as BMR, or Basal Metabolic Rate. This number of calories reflects how much energy your body requires to support vital body functions. In fact, your BMR is the single largest component (upwards of 60 percent) of your total energy burned each day.

Basically, your body burns calories just by doing nothing, and this is the number those calories are.

Active Calories

These are the calories you burn by being active, such as walking, hiking, playing sports, etc. These calories are vital to losing weight, as the only way to burn more calories than you eat while maintaining a healthy diet is to burn active calories.

When you're exercising only active calories are recorded,using your figures if you were not doing the activity then you would have burned 45 resting calories.