BMR TDEE Body Composition Calculator Suite

Explanation and clinical context Basal metabolic rate estimated by the Mifflin St Jeor equation reflects resting energy expenditure in adults and is widely used due to its accuracy across different populations. Total daily energy expenditure combines basal metabolic rate with an activity factor to estimate energy needs for weight maintenance. Adjustments for weight gain or loss typically use a fifteen percent change in daily calories to achieve a steady and controlled change in energy balance.

Body fat percentage can be user provided or estimated using the relative fat mass method which relies on the ratio of height to waist circumference and provides an estimate suitable for clinical screening. Fat free mass index corrects lean mass for height and is used to assess muscularity. The ketogenic macronutrient distribution uses five percent carbohydrate twenty percent protein and seventy five percent fat by calories and is included for users following specific dietary strategies.

Protein intake recommendations of 1.2 to 2.0 grams per kilogram reflect widely accepted guidance for maintaining lean mass. Reference Mifflin MD et al. A new predictive equation for resting energy expenditure in healthy individuals.

American Journal of Clinical Nutrition 1990. Woolcott OO and Bergman RN. Relative fat mass a new estimator of whole body fat percentage.

Scientific Reports 2018.