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# Calories, Weight and Height According to Age

by
Jill Corleone, RDN, LD
Jill Corleone is a registered dietitian and health coach who has been writing and lecturing on diet and health for more than 15 years. Her work has been featured on the Huffington Post, Diabetes Self-Management and in the book "Noninvasive Mechanical Ventilation," edited by John R. Bach, M.D. Corleone holds a Bachelor of Science in nutrition.
Estimating your calorie needs based on age, height and weight can help you better manage your weight. Photo Credit STUDIO GRAND OUEST/iStock/Getty Images

Maintaining a healthy weight throughout your life is not only good for your health, it's also good for the quality of life, too, says the 2010 Dietary Guidelines for Americans. Calorie balance is key to weight control. While there are a number of mathematical equations used to determine calorie needs, some include height, weight and age. Consult your doctor or dietitian to help you determine your calorie needs.

## Height, Weight and Age for Calories

Equations that use your height, weight and age to determine your calorie needs generally estimate your basal metabolic rate. Your BMR is the number of calories your body needs for basic bodily functions, including the maintenance of organs and tissue, heartbeat and respiration.

The Harris-Benedict equation is commonly used because it is considered quick and easy, according to Kent State University. The equation is different for men and women.

For men, the formula is: 66 + (6.23 X weight in pounds) + (12.7 X height in inches) - (6.8 X age in years).

For women, it is: 655 + (4.35 X weight in pounds) + (4.7 X height in inches) - (4.7 X age in years).

So, for example, a 6-foot tall 45-year-old man weighing 208 pounds has a BMR of 1,970 calories (66 + 1295.84 + 914.4 - 306).

## Activity Factors

The BMR equation provides a baseline for your calorie needs, but it's not the whole picture. Your total daily calorie needs also include activity factors. Factors range from 1.2 for people with a desk job and very little activity to 1.9 for people training for a triathlon. Your BMR is multiplied by these factors to determine your daily calorie needs. For example, if the 45-year-old man exercises three days a week, you can determine his daily calorie needs by multiplying his BMR by an activity factor of 1.375, which means he needs 2,709 calories to maintain his current weight.

## Other Ways to Estimate Calories

While the Harris-Benedict formula is most often used to estimate calories based on weight, height and age, it's not the only formula. The University of Colorado at Denver reports that the Mifflin equation is a more accurate formula for estimating BMR. Like Harris-Benedict, this formula is also gender-specific.

The Mifflin formula for estimating BMR for men is: (10 X weight in kilograms) + (6.25 X height in centimeters) - (5 X age in years) + 5.

For women, it is: (10 X weight in kilograms) + (6.25 X height in centimeters) - (5 X age in years) - 161. Divide weight in pounds by 2.2 to get kilograms, and multiply height in inches by 2.54 to get centimeters.

The Mifflin formula estimates the 6-foot-tall, or 182.9 centimeters, 208-pound, or 94.5 kilograms, 45-year-old man's BMR as 1,868 calories (945+1143.125-225+5).

## Benefits of Knowing Your Calories

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