What is the mathematical formula of Mifflin-St Jeor?

Males: BMR = 10 x weight (kg) + 6.25 x height (cm) - 5 x age + 5. Females: BMR = 10 x weight + 6.25 x height - 5 x age - 161. Published in 1990, accuracy ±10% for normal-weight adults. Implemented in JavaScript in 2 lines, idempotent and stateless.

Difference between Mifflin-St Jeor, Harris-Benedict and Katch-McArdle equations?

Harris-Benedict (1919, revised 1984): BMR = 88.362 + 13.397×weight + 4.799×height - 5.677×age (M). Overestimates BMR by 5-10% for modern populations. Mifflin-St Jeor (1990): more accurate on contemporary data. Katch-McArdle: BMR = 370 + 21.6 × LBM, requires lean body mass (requires DEXA scan or % fat calculation).

How is metabolic age calculated from BMR?

User BMR comparison with a lookup table of average BMR by age. Algorithm: find the age with the average BMR closest to the calculated value. For values outside range ( max), linear interpolation. Output: etage_metabolic = argmin(|BMR_avg[i] - BMR_user|) for i in [20, 70].

How to implement a BMR (Basal Metabolic Rate) calculator in Spring Boot/Python?

Mifflin-St. Jeor Equation Calculator: `def mifflin(gender: str, weight_kg: float, height_cm: float, age: int) -> float: return 10*weight_kg + 6.25*height_cm - 5*age + (5 if gender == "male" else -161)`

TDEE vs BMR: what's the difference?

Basal Metabolic Rate (BMR) = absolute resting calories (sleep, rest). Total Daily Energy Expenditure (TDEE) = BMR x activity factor. Activity factors Harris-Benedict: sedentary 1.2, light 1.375, moderate 1.55, active 1.725, very active 1.9. For calorie balance TDEE is the relevant value, not pure BMR.

Why does BMR decrease with age (-5 x age)?

Muscle loss (sarcopenia) of 3-8% per decade after age 30 is reflected in the coefficient -5 × age. Muscle mass has a BMR ~13 kcal/kg/day compared to fat tissue, which has a BMR of 4.5 kcal/kg/day. Resistance training can help mitigate muscle loss by maintaining lean body mass (LBM).

Metabolic Age Calculator | Federico Calò

Physical Data

Insert your data to calculate BMI and metabolic age.

Genre

Weight (kg)

Height (in cm)

Age (years)

Enter your physical data to calculate the metabolic age.

Come utilizzare Calcolatore Età Metabolica

Inserisci i tuoi dati fisici

Seleziona il genere e inserisci peso (kg), altezza (cm) e età.

Calcolo del BMR

Il BMR (Basal Metabolic Rate) viene calcolato con la formula di Mifflin-St Jeor, la più accurata per adulti.

Confronto con la media

Il tuo BMR viene confrontato con i valori medi per fascia d'età per determinare l'età metabolica.

Interpreta i risultati

Un'età metabolica inferiore alla tua età anagrafica indica un metabolismo più attivo della media.

Suggerimenti

L'esercizio con resistenza (pesi) aumenta la massa muscolare, che brucia più calorie a riposo rispetto al grasso.
Il metabolismo rallenta circa il 2-3% per ogni decade dopo i 25 anni: è normale, non allarmante.
Una dieta ricca di proteine richiede più energia per la digestione (effetto termico), aumentando leggermente il metabolismo.

Domande frequenti

What is my basal metabolic rate?

Basal Metabolic Rate is the number of calories the body burns at rest over 24 hours to maintain basic vital functions: breathing, circulation, body temperature.

What is metabolic age?

Age Metabolism compares your BMR to the average BMR of people in your age group. A lower age metabolism suggests a more active metabolism.

How can you improve your metabolic age?

Regular exercise (especially with weights), adequate protein diet, and good sleep help maintain or improve your basal metabolism.

How accurate is the Mifflin formula?

The Mifflin-St Jeor formula has a precision of ±10% for most adults under normal conditions, with factors such as body composition affecting the result.