It is essentially, the number of calories your body needs to preserve its existing bodyweight.The Basal metabolic rate formula is as follows:
Females: 655 + (4.35 x bodyweight in lbs) + (4.7 x height in inches) - (4.7 x age in decades)
Men: 66 + (6.23 x weight in lbs) + (12.7 x height in inches) - (6.8 x age in years)
Please keep in mind when calculating your BMR that 1 inch is equal to 2.54 cm and 1kg is equal to 2.2lbs. Making use of the metric equivalents are