Is there more to calculating EER? Body type, muscle mass, etc?

Your EER is an estimate of the calories that your body requires at "rest", basically as your day-to-day world looks in this moment how many calories do you need to produce enough energy to maintain. This is just an estimate and does not account for body type, etc. There are three different body types, but most people fit somewhere in between two of these.

Ectomorphs are generally tall and thin and have long arms and legs. These people have difficulty gaining weight and muscle no matter how much they eat or how hard they weight train. They have the body type you tend to see in ballet dancers, runway models, long-distance runners, and some basketball players. A very small proportion of the population has this type of body.

Mesomorphs are generally muscular, shorter, and have stocky arms and legs. These people are strong and tend to gain muscle mass when they do strength training. They may find it difficult to lose weight, but they excel in power sports like soccer, softball, vaulting in gymnastics, sprinting events in track and field.

Endomorphs are generally shaped like apples or pears and carry more body fat. Their bodies resist losing weight and body fat no matter how restrictive they are with their eating. In fact, the more they “diet,” the more their metabolisms slow down to resist weight loss. These people are better able to handle long periods of starvation and famine (which was a benefit to our ancestors). Sports they excel at are distance swimming, field events, and weight lifting.

Body weight is not the best indicator of health and fitness, body composition is a better indicator. Why? Your genes determine your body type. Some body types carry more fat than others--no matter what you eat or how much you exercise. Percent body fat does not necessarily tell you how healthy or fit you are, or tell you how you look. How does one measure body fat? This isn't something that is very easy to measure, because it changes based on water weight and has a huge error margin.

Your body mass index is a helpful measurement to tell you if you fall within a healthy range (if you have a lot of muscle mass, this may not be the ideal measurement). BMI is calculated by the following formula: weight in kg / height in m2. If you're not familiar with kilogram and meter measurements, follow the steps below to calculate your BMI.

Step 1. Take your weight (in pounds) x 705

Step 2. Divide that number by your height (in inches)

Step 3: Divide that number by your height (in inches) again

Example: Woman who is 5’3” and weighs 135 lb.

Step 1. 135 lb. x 705 = 95175

Step 2. 95175 / 63” = 1511

Step 3. 1511 / 63” = 24

BMI = 24

Underweight Less than 18.5
Healthy weight 18.5-24.9
Overweight 25.0-29.9
Obese I 30.0-34.9
Obese II 35.0-39.9
Obese III 40+

So, yes, there is much more to caloric intake than the EER calculation.