Protein, Energy and BMI Calculator
Enter the data below to receive estimated daily protein and calorie needs for healthy adults, as well as Body Mass Index (BMI).
About this Calculator
Percent of Calories from Protein: Using a
factor of 10 – 35 percent of calories from protein is recommended based
on the Acceptable Macronutrient Distribution Range (AMDR) for adults,
developed by the Food and Nutrition Board of the Institute of Medicine,
National Academies.1 AMDRs are ranges of intakes for
macronutrients expressed as a percentage of total energy; for adults,
the AMDR for carbohydrates = 45 - 65 percent of calories and the AMDR
for fat = 20 - 35 percent of calories.
Activity Level Factor: Calorie needs aren’t
based on height, weight, age and gender alone. Adding an Activity Level
Factor accounts for calorie needs above and beyond the amount needed at
Estimated Daily Protein Needs: Estimated Daily
Protein Needs (grams) = Percent of Calories from Protein divided by 4
because there are 4 calories in a gram of protein.
Estimated Daily Calorie Needs: Estimated Daily
Calorie Needs = Resting Energy Expenditure (REE) multiplied by the
Activity Level Factor selected. This calculator uses the Mifflin/St.
Jeor formula to calculate REE.2
BMI (Body Mass Index): BMI is a measure of body fat based on height and weight that applies to adult men and women. BMI Categories: Underweight = <18.5; Normal weight = 18.5–24.9; Overweight = 25–29.9; Obesity = BMI of 30 or greater.3
1 Food and Nutrition Board, Institute of Medicine, National
Academies. Dietary Reference Intakes for Energy, Carbohydrate, Fiber,
Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids (2002/2005).
Dietary Reference Intakes (DRIs): Acceptable Macronutrient Distribution
Ranges. Available at: http://www.nap.edu/openbook.php?record_id=10490&page=1325. Accessed September 28, 2010.
2 MD Mifflin, ST St Jeor, LA Hill, BJ Scott, SA Daugherty and YO
Koh. A new predictive equation for resting energy expenditure in healthy
individuals. American Journal of Clinical Nutrition, Vol 51, 241-247,
Copyright © 1990. Available at: http://www.ajcn.org/cgi/content/abstract/51/2/241 Accessed September 28, 2010.
3 National Heart, Lung, and Blood Institute/National Institutes of Health. Calculate Your Body Mass Index. Available at: http://www.nhlbisupport.com/bmi. Accessed September 28, 2010.