Energy estimates from fat-free mass
Fat-free mass = weight × (1 − fat / 100). Katch–McArdle: 370 + 21.6 × fat-free mass; Cunningham: 500 + 22 × fat-free mass. Daily Katch estimate multiplies by the selected activity factor.
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Calculation
Result
- Total Daily Energy Expenditure (TDEE)
- 2850 kcal/day
- Basal Metabolic Rate (Katch-McArdle)
- 1839 kcal/day
- Basal Metabolic Rate (Cunningham 1991)
- 1996 kcal/day
- Basal Metabolic Rate (Mifflin-St Jeor)
- 1758 kcal/day
- Lean Body Mass (LBM)
- 68.0 kg
- Difference: Katch vs. Mifflin
- +81 kcal/day
Fat-free mass = weight × (1 − fat / 100). Katch–McArdle: 370 + 21.6 × fat-free mass; Cunningham: 500 + 22 × fat-free mass. Daily Katch estimate multiplies by the selected activity factor.
Energy required to sustain vital physiological functions at complete rest
Fat-free mass = weight × (1 − fat / 100). Katch–McArdle: 370 + 21.6 × fat-free mass; Cunningham: 500 + 22 × fat-free mass. Daily Katch estimate multiplies by the selected activity factor.
Calculation based on total scale weight without body composition adjustment
These are estimates, not calorimetry measurements. Body fat error and approximate activity factors affect results. A difference between equations does not establish which is more accurate for you.
These are estimates, not calorimetry measurements. Body fat error and approximate activity factors affect results. A difference between equations does not establish which is more accurate for you.
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How it is calculated
Fat-free mass = weight × (1 − fat / 100). Katch–McArdle: 370 + 21.6 × fat-free mass; Cunningham: 500 + 22 × fat-free mass. Daily Katch estimate multiplies by the selected activity factor.
Formula
LBM = Weight × (1 − % Body Fat / 100); BMR (Katch) = 370 + 21.6 × LBM(kg); TDEE = BMR × Activity Factor; BMR (Cunningham) = 500 + 22 × LBM(kg).
Limits of the method
These are estimates, not calorimetry measurements. Body fat error and approximate activity factors affect results. A difference between equations does not establish which is more accurate for you.
Sources of the method
- McArdle W.D., Katch F.I., Katch V.L. Exercise Physiology: Nutrition, Energy, and Human Performance. 8th ed. Wolters Kluwer
- Cunningham JJ. et al. Body composition as a determinant of energy expenditure: a synthetic review and a proposed general prediction equation. Am J Clin Nutr, 1991
- Mifflin MD et al. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr, 1990
This calculation is for reference only and is not medical advice, a diagnosis or a prescription. If you have a medical condition, are pregnant, take medication or have any doubts, discuss the result with a physician or a qualified nutrition professional.
How to use the calculation
Enter the starting values
Fat-free mass = weight × (1 − fat / 100). Katch–McArdle: 370 + 21.6 × fat-free mass; Cunningham: 500 + 22 × fat-free mass. Daily Katch estimate multiplies by the selected activity factor.
Adjust the parameters
LBM = Weight × (1 − % Body Fat / 100); BMR (Katch) = 370 + 21.6 × LBM(kg); TDEE = BMR × Activity Factor; BMR (Cunningham) = 500 + 22 × LBM(kg).
Read the result
These are estimates, not calorimetry measurements. Body fat error and approximate activity factors affect results. A difference between equations does not establish which is more accurate for you.
Frequently asked questions
What does the calculation show?
Fat-free mass = weight × (1 − fat / 100). Katch–McArdle: 370 + 21.6 × fat-free mass; Cunningham: 500 + 22 × fat-free mass. Daily Katch estimate multiplies by the selected activity factor.
What limitations apply?
These are estimates, not calorimetry measurements. Body fat error and approximate activity factors affect results. A difference between equations does not establish which is more accurate for you.
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What next
Formula breakdowns, biomarker reference ranges and nutrition articles with cited sources are in the NutriFit knowledge base.
Go to the knowledge base