CALCULATIONS
There are many types of calculations one can do to find out how healthy we are or how much we should eat. They vary a lot. I included three which I use constantly.
                                    Body Mass Index
                                    HOW MUCH SHOULD I EAT
                                    APPLE VS PEAR RISK RATIO
BMI
What is it for? It determines how much one should weight according to how tall you are. It helps estimating total body fat. BMI can be used to determine if you are at risk in conjuction with other calculations and lifestyle.

Method 1.
1) Convert your height from feet to inches. Guide 5 feet= 60 in. 6 feet= 62 in.
     i.e. 5f4in = 64in
2) Multiply your height in inches by itself, write it down.
     i.e. 64 * 64 = 4096
3) Divide your weight in pounds by your height squared. Multiply this result by 703.
     i.e. 125 lbs / 4096 = 0.030517578125 * 703 = 21.45 =21.5
4) This is your BMI result. Compare it with the table below to see if yours is in a              healthy range.
Method 2
  1) Multiply your height in meters by itself. Write the result down.
      i.e. 1.65 * 1.65 = 2.7225
  2) Divide your weight in kilos over your height squared.
      i.e. 58 kg / 2.7225 = 21.3
  3) This is your BMI result. Compare it with the table below to see if yours is within a healthy range.

                                  
BMI
Below 18.5
18.5 - 24.9
25-29.9
30 an Above
RISK
Underweight
Normal
Overweight
Obese
How Much Should I Eat
Method 1
1) Multiply .9 (women) by your weight in kilos. This is your hourly metabolic rate.         i.e. 59 * 0.9 = 53.1                      
2) Multiply your hourly basal metabolic rate by 24 to get your daily basal met rate.
     i.e. 53.1 *24 = 1274.4
3) Multiply basal met rate by your activity factor.
     Guide-
     Sedentary -not doing much = 1.2
     Moderate- working out 30 mins 3 times a week = 1.5
     Active- training for a marathon = 2
     i.e. 1274.4 * 1.5 = 1911.6 cals
   4) This is what you should eat to mantain your weight. To LOSE or to GAIN.

Method 2
1) Multiply your weight in pounds by your activity level.
     Guide
13-Sedentary- You dont work out, you sit at an office for more than 8 hours daily.
14-Light Activity- Work out a few times a week, you stand around a lot in your job.
15-Moderate Activity- Work out an hour a day every day. You work out an hour a           day most days of the week  and your job involved running around a lot
16-Very Active - You work out several hours a day. Your job involves heavy labor.
      i.e. 125 lbs  * 15 = 1875 cal.
  2) This is what you should eat to maintain your weight. To LOSE or to GAIN.
Apple vs Pear Ratio
What is it for? This ratio lets you know whether your body shape tends to be an apple or a pear. An apple will have a result higher than 0.80 while a pear 's result will be lower. An apple will be more at risk than a pear for diabetes, high blood pressure, heart disease and stroke. However, if your BMI and weight are within a healthy range, there is no need for concern.
METHOD:

   1) Measure your waist in inches
       i.e. 27 inches
   2) Measure your hips in inches
       i.e. 36 inches
   3) Divide your waist measurement over your hips measurement.
       i.e. 27 / 36   =  0.75
    4) A ratio below 0.80 means you are a pear. A ratio above 0.80 means you are an                apple.   
       i.e. 0.75 you are a pear.                      
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