# 13.2: Nutrition Calculations Reference Sheet

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Background Information: 1 kilogram = 2.2 pounds 1 inch = 2.54 centimeters 60 inches = 5 feet

## Anthropometric Calculations

Hamwi Method for Ideal Body Weight (IBW)

Female equation

5 feet = 100#, every inch over add 5#

Male equation

5 feet = 106#, every inch over add 6#

Ideal Body Weight Range (IBW range)

Percent Ideal Body Weight (% IBW)

Actual Weight X 100

IBW

Analysis of IBW

Greater than 120% of IBW: Obese

110%-120% of IBW: Overweight

80%-89% of IBW: Underweight

70%-79% of IBW: Moderately underweight

Less than 70% of IBW: Severely underweight

Percent Usual Body Weight (UBW)

Actual Weight X 100

UBW

Analysis of UBW

Changes of 10% or less of no major concern unless person above or below IBW

Changes of 10% or more need to be addressed, is weight gain or loss desired or planned

Body Mass Index (BMI)

Weight in pounds x 703

(height in inches)2

Analysis of BMI

BMI< 18.5 = Underweight

BMI 18.5 -24.9 = Normal

BMI 25-29.9 = Overweight

BMI 30 – 34.9 Class 1 Obesity

BMI 35 – 39.9 = Class 2 Obesity

BMI over 40 = Class 3 Extreme Obesity

Waist Circumference

Males < 40 inches = Healthy

Females < 35 inches = Healthy

Waist-to-Hip Ratio

Waist Circumference / Hip Measurement

Analysis of Waist-to-Hip Ratio

Males > 0.9 Abdominal Obesity

Females >0.85 Abdominal Obesity

Body Fat Percentage

MEN: WOMEN:

2-4% body fat is essential 10-12% is essential

6-13% is an athletic body fat range 14-20% is a healthy range for athletes

14-17% is considered a 'fit' range 21-24% is healthy for fitness

18-25% is acceptable 25-31% is an 'acceptable' range

above 26% is considered obese above 32% is considered obese

Fat Mass

Body Weight x Body Fat %

Lean Mass

Body Weight – (Body weight x Body Fat %)

## Estimating Nutrients Needs for Adults

Basal Metabolic Rate (BMR): Energy needed to keep you alive

Male: weight in kg x 1 calorie/kg/hour x 24 hours

Female: weight in kg x 0.9 calorie/kg/hour x 24 hours

Total Energy Expenditure (TEE): Energy needed to keep you alive plus activity factor

BMR x Activity Factor

Sample Activity Factors:

Confined to bed: 1.2

Out of bed, low activity 1.25

Average activity 1.65

Highly active 2.0

Quick Determination of Total Energy Expenditure (TEE)

• Another method for estimating daily energy needs for adults

• Used frequently in a clinical setting

Weight in kilograms x Activity factor

Activity/stress Factor:

Minimal Activity (bedridden): 25 kcal x kg

Normal Activity (ambulatory): 30 kcal x kg

Moderate Activity (exercise 3x/week): 35 kcal x kg

Increased Activity (exercise 5x/week): 40 kcal x kg

Intense Activity (exercise daily): 45 kcal x kg

Determining Protein Needs

Weight in kg X protein factor

Protein Factor:

Normal activity 0.8gm/kg/day

Daily physical activity 1.0-1.2 gm/kg/day

Heavy daily physical activity 1.2-1.5 gm/kg./day

Determining Fluid Needs

• Can determine based on calorie intake OR weight

1 ml of fluid for every calorie intake

OR

Weight in kg x Fluid factor

Fluid Factors:

25 ml X kg body wt for > 75 yo or inactive

30 ml X kg body wt for 55-75 yo or moderately active

35 ml X kg body wt for 20-55 yo or moderately active

40 ml X kg body wt for 16-30 yo or highly active

13.2: Nutrition Calculations Reference Sheet is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts.