What is BMR and why is it important?

BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest to maintain vital functions like breathing and circulation. It forms the baseline for daily calorie needs, helping you manage weight or plan nutrition.

Which BMR formula is most accurate?

The Mifflin-St Jeor equation is widely considered the most accurate for the general population. The Revised Harris-Benedict is also reliable, while Katch-McArdle is best for lean individuals if you know your body fat percentage.

How does body fat percentage affect BMR?

Muscle tissue burns more calories than fat, so a lower body fat percentage (more muscle) typically increases BMR. The Katch-McArdle formula uses body fat to estimate lean mass, making it more precise for athletic or muscular individuals.

Fitness

Instantané, privé et gratuit

Calculatrice de Métabolisme de Base.

15 oct. 2026

Calculez votre métabolisme de base (BMR) à l'aide des formules Mifflin-St Jeor, Harris-Benedict révisée et Katch-McArdle.

Cette calculatrice n'est pas encore entièrement traduite ; une partie du texte s'affiche en anglais.

Calcul sur l'appareilSans inscription

Saisissez vos valeurs

Les résultats se mettent à jour pendant la saisie.

02 / RÉPONSE

Système d'unités

Sexe

Âge

Poids

Taille

Formule

Pourcentage de graisse corporelleOptionnel - pour la formule Katch-McArdle

Optionnel - pour la formule Katch-McArdle

Résultats

1674Calories par jour

Votre taux métabolique de base (BMR) est le nombre de calories que votre corps brûle au repos.

Comparaison

Mifflin-St Jeor

1674 kcal

Revised Harris-Benedict

1724 kcal

Katch-McArdle

N/A

Tableau d'activité

Niveau d'activité	Calories
SédentairePeu ou pas d'exercice	2009 kcal
LégerExercice léger 1-3 jours/semaine	2302 kcal
ModéréExercice modéré 3-5 jours/semaine	2595 kcal
ActifExercice intensif 6-7 jours/semaine	2888 kcal
Très actifExercice très intensif ou travail physique	3181 kcal

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Cite this calculator

Canonical URL: https://mathify.one/fr/fitness/bmr

Updated 15 oct. 2026

Cite as: Mathify. (2026). Calculatrice de Métabolisme de Base. https://mathify.one/fr/fitness/bmr

Use Cases

Weight Management Planning

Determine your resting calorie burn to set realistic calorie targets for weight loss, gain, or maintenance.

Example: If your BMR is 1,500 calories, you might aim for 1,200–1,300 calories daily to lose weight.

Nutrition and Fitness Tracking

Use BMR as a baseline to calculate total daily energy expenditure (TDEE) and adjust macronutrient intake.

Example: Combine BMR with activity level to estimate daily calorie needs for training.

Frequently Asked Questions

What is BMR and why is it important?: BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest to maintain vital functions like breathing and circulation. It forms the baseline for daily calorie needs, helping you manage weight or plan nutrition.
Which BMR formula is most accurate?: The Mifflin-St Jeor equation is widely considered the most accurate for the general population. The Revised Harris-Benedict is also reliable, while Katch-McArdle is best for lean individuals if you know your body fat percentage.
How does body fat percentage affect BMR?: Muscle tissue burns more calories than fat, so a lower body fat percentage (more muscle) typically increases BMR. The Katch-McArdle formula uses body fat to estimate lean mass, making it more precise for athletic or muscular individuals.

Tips & Common Mistakes

Tips

Enter your height in either centimeters or feet/inches – the calculator will handle the conversion.
For the Katch-McArdle formula, provide an accurate body fat percentage for the best estimate.
Use the same formula consistently when tracking changes over time to see trends.
BMR is a resting estimate; multiply by an activity factor to estimate total daily burn.

Common Mistakes to Avoid

Using the wrong height unit – double-check if you entered cm or ft/in.
Forgetting to enter body fat percentage when using Katch-McArdle, which then may not be accurate.
Assuming BMR equals total daily calorie needs – it's only the resting portion.

Last updated: August 13, 2026