the number of calories your body burns while you are resting is called.

basal metabolism

The number of calories your body burns while you are resting is called the Basal Metabolic Rate (BMR). BMR represents the minimum amount of energy (calories) your body needs to function at rest, to maintain vital functions such as breathing, circulating blood, and cell production. To calculate your BMR, you can use the Harris-Benedict equation:

For Men: BMR = 88.362 + (13.397 x weight in kg) + (4.799 x height in cm) - (5.677 x age in years)
For Women: BMR = 447.593 + (9.247 x weight in kg) + (3.098 x height in cm) - (4.330 x age in years)

Once you determine your BMR, you can then calculate your daily calorie needs by considering your activity level using the following factors:
- Sedentary (little or no exercise): BMR x 1.2
- Lightly-active (light exercise/sports 1-3 days/week): BMR x 1.375
- Moderately-active (moderate exercise/sports 3-5 days/week): BMR x 1.55
- Very-active (hard exercise/sports 6-7 days a week): BMR x 1.725
- Super-active (very hard exercise/sports & physical job or 2x training): BMR x 1.9

Keep in mind that these calculations provide estimates, and individual variations such as muscle mass, genetics, and other factors can influence your actual calorie burn.