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Calorie Needs Determined by Body Surface Area
How to Calculate Daily Calorie Needs Using Body Surface Area
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How to Estimate Daily Caloric Requirements

How to Calculate Your Daily Calorie Needs
Using Body Surface Area

Four Steps to Determine Your Total Daily Calorie Needs

  • Select the average hourly BMR for your age & gender (Chart A)
  • Select your Body Surface Area figure (Chart B)
  • Multiply your BMR by Your BSA figure. Then multiply the result by 24.
  • Multiply this by your Activity Level Number

STEP 1. SELECT YOUR HOURLY BMR

Select your average hourly BMR from the following chart.

Chart A - Average Hourly BMR

Age BMR Women BMR Men
20 37 39
25 36 38
30 36 37
35 36 37
40 36 37
45 36 37
50 35 37
55 35 36
60 33 35
65 33 35
70 32 34
75 32 34
80 32 33

BMR Example
If you are female, aged 25, your average hourly BMR is 36

STEP 2. SELECT YOUR BODY SURFACE AREA FIGURE

Find your nearest height and weight from the following chart.
Select the corresponding Body Surface Area Figure

Chart B - Body Surface Area

4 feet 10 Body Surface Area
70 pounds 1.1
80 pounds 1.2
100 pounds 1.3
120 pounds 1.4
140 pounds 1.5
160 pounds 1.6
180 pounds 1.7
200 pounds 1.8
5 feet 0 inches Body Surface Area
80 pounds 1.2
100 pounds 1.3
120 pounds 1.5
140 pounds 1.6
160 pounds 1.7
180 pounds 1.8
200 pounds 1.9
220 pounds 2.0
5 feet 2 inches Body Surface Area
80 pounds 1.3
100 pounds 1.4
120 pounds 1.5
140 pounds 1.6
160 pounds 1.7
180 pounds 1.8
200 pounds 1.9
220 pounds 2.0
5 feet 4 inches Body Surface Area
100 pounds 1.4
120 pounds 1.6
140 pounds 1.7
160 pounds 1.8
180 pounds 1.9
200 pounds 2.0
220 pounds 2.1
240 pounds 2.2
5 feet 6 inches Body Surface Area
100 pounds 1.5
120 pounds 1.6
140 pounds 1.7
160 pounds 1.8
180 pounds 1.9
200 pounds 2.0
220 pounds 2.1
240 pounds 2.2
5 feet 8 inches Body Surface Area
120 pounds 1.6
140 pounds 1.7
160 pounds 1.8
180 pounds 1.9
200 pounds 2.0
220 pounds 2.1
240 pounds 2.2
260 pounds 2.3
5 feet 10 inches Body Surface Area
120 pounds 1.7
140 pounds 1.8
160 pounds 1.9
180 pounds 2.0
200 pounds 2.1
220 pounds 2.2
240 pounds 2.3
260 pounds 2.3
280 pounds 2.4
6 feet 0 inches Body Surface Area
120 pounds 1.7
140 pounds 1.8
160 pounds 1.9
180 pounds 2.0
200 pounds 2.1
220 pounds 2.2
240 pounds 2.3
260 pounds 2.4
280 pounds 2.5
6 feet 2 inches Body Surface Area
140 pounds 1.8
160 pounds 1.9
180 pounds 2.0
200 pounds 2.1
220 pounds 2.2
240 pounds 2.3
260 pounds 2.4
280 pounds 2.5
300 pounds 2.6

Body Surface Area Example
If you are 5 feet 4 inches tall and weigh 155 pounds, your (nearest) BSA figure is 1.8

STEP 3. MULTIPLY YOUR BMR By YOUR BODY SURFACE AREA FIGURE, THEN By 24

Example
Your BMR is 36.
Your BSA is 1.8

Calculation is: 36 X 1.8 X 24 = 1555

STEP 4. SELECT YOUR ACTIVITY LEVEL NUMBER

Select your Activity Level Number from the following list.

Activity Level

  • Very Light = 1.3
    Typically inactive. Office job, no exercise.
  • Light = 1.4
    Mostly sedentary, some light walking or household chores.
  • Moderate = 1.6 (women) or 1.7 (men)
    Some vigorous exercise plus a more active lifestyle.
  • Heavy = 1.8 (women) or 1.9 (men)
    High level of activity, both at work and at leisure.

Now multiply the result from STEP 3 (1555) by your chosen Activity Level Number.

Example
You lead a generally sedentary life.
Calculation is 1555 X 1.6 = 2488
This is the total number of daily calories you need in order to MAINTAIN your current weight.

How Many Calories Do You Need to Lose Weight or Gain Weight

Now you know what your calorie-needs are, find out how many calories you need each day in order to lose or gain weight.


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