To
lose weight, you must burn more calories than you consume. The number of calories
you need can be determined by calculating your Basal Metabolic Rate (BMR). Click
here to access our Basal Metabolic
Rate Calculator, or read on to see the formula.

 Basal metabolic rate (BMR)
is the amount of energy expended while at rest, meaning you are doing virtually
nothing (no exercise, no eating, etc.). BMR decreases with age and with the loss
of lean body mass. Exercising and increased muscle mass can increase the BMR. To
accurately calculate your Basal Metabolic Rate clinical studies are required.
However, a reasonably accurate estimate of your BMR can be calculated using a
formula. There are many places you can go to have the math done for you. My favorite
is this Basal Metabolic Rate
calculator.  Using this BMR calculator a 40 year old,
150 pound 5 foot tall male has a BMR of 1,491 calories per day. A similar female
has a BMR of 1,402 calories per day. To lose weight, the female would need
to consumer less than 1,402 calories per day, or increase her activity level,
or both. Note that this calculation assume zero activity. If you assume light
activity (moderate exercise 1 to 3 days per week), which is more realistic, the
male has a "breakeven" point of 2,049 calories per day, and a female
would be 1,927 calories per day. If you want to do the calculations yourself,
here is the formula to calculate the Basal Metabolic Rate (BMR): Basal
Metabolic Rate (BMR) Calculator:
Women: BMR
= 655+ (4.35 x weight in pounds) + (4.7 x height in inches)  (4.7 x age in years) Men:
BMR = 66 + (6.23 x weight in pounds) + (12.7 x height in inches)  (6.8 x age
in years) Take
this result and multiply it by your activity level (known as the HarrisBenedict
equation):  Sedentary:
(little or no exercise): BMR x 1.2
 Light
activity: (moderate exercise or sports 1 to 3 days per week): BMR x 1.375
 Moderate
activity: (moderate exercise or sports 3 to 5 days per week): BMR x 1.55
 Very
active: (hard exercise or sports 6 to 7 days per week): BMR x 1.725
 Extremely
active: (very hard exercise or sports and a physical job, activity or
training 2 times per day): BMR x 1.9
If
you prefer the metric system, here are the calculations: Women:
BMR = 655+ ( 9.6 x weight in kilos ) + ( 1.8 x height in cm )  ( 4.7 x age in
years) Men:
BMR = 66 + (13.7 x weight in kilos ) + ( 5 x height in cm )  ( 6.8 x age in years)
Take this result and multiply
it by your activity level (see above): Note:
If you are overweight, this equation may overestimate the calories you require,
so you should use a weight that is halfway between your current weight and your
goal weight. For example, if you weigh 200 pounds and want to weigh 150 pounds,
use 175 pounds in this formula, and then adjust it as you lose weight.
