Calculez IMC, TDEE, calories, macros et plus — 100% gratuit, privé et instantané.
Every key fitness metric — one tool, zero friction
Calculateur d'IMC
Calculez votre Indice de Masse Corporelle et trouvez votre poids santé.
Calculateur de TDEE
Calculez votre Dépense Énergétique Totale selon votre activité.
Calculateur de MB
Trouvez votre Métabolisme de Base — calories brûlées au repos.
Calculateur de Graisse
Estimez votre pourcentage de graisse corporelle.
Calculateur de Poids Idéal
Trouvez votre poids idéal selon votre taille et morphologie.
Calculateur de Calories
Obtenez votre objectif calorique pour perdre, maintenir ou gagner du poids.
Calculateur de Macros
Calculez les ratios optimaux de protéines, glucides et lipides.
Calculateur d'Hydratation
Calculez votre besoin quotidien en eau selon poids et activité.
Calculateur de Zones Cardiaques
Trouvez vos zones de fréquence cardiaque d'entraînement.
Calculateur de Masse Maigre
Calculez votre masse corporelle maigre.
Calculateur de 1RM
Estimez votre répétition maximale pour tout exercice.
Calculateur de Protéines
Trouvez votre apport quotidien en protéines pour la prise de muscle.
Calculateur de Sommeil
Trouvez les heures optimales de coucher et réveil.
Calculateur de Dette de Sommeil
Calculez votre dette de sommeil accumulée.
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Why CalaiFitness
Every calculation runs entirely in your browser using JavaScript. No data is ever sent to our servers, logged, or sold. What you enter stays on your device — always.
0 bytes
sent to servers
We use only peer-reviewed formulas: Mifflin-St Jeor for BMR/TDEE, the US Navy method for body fat, WHO BMI standards, and the Karvonen formula for heart rate zones.
10+
validated formulas
Your results are saved automatically to your browser's local storage. Open the dashboard to see your history and track how your numbers change week over week.
100%
on-device storage
Simple by Design
Pick from 18 free calculators covering every key fitness metric — from BMI to body fat to daily calories.
Input your measurements in metric or imperial units. Our clean, distraction-free interface takes seconds to fill out.
Results appear immediately, with context, categories, and advice. Save to history to track your progress over time.
Quick Answers
TDEE (Total Daily Energy Expenditure) is the total calories your body burns each day, including activity. It's the most important number in nutrition — knowing it lets you set an exact calorie target for fat loss, maintenance, or muscle gain.
Learn more →BMI is accurate as a population-level screening tool for adults. It has known limitations for athletes and older adults due to muscle mass differences. For a complete picture, pair it with body fat percentage.
Learn more →Completely private. All calculations run in your browser — nothing is ever sent to our servers. We have no database of user data. Your history is stored in your browser's localStorage only.
Learn more →Science-Based Articles
What is a healthy BMI for a 45-year-old woman who exercises? Discover why standard BMI charts mislead active women, ideal body fat ranges, and how to assess true health.
Read article →How many calories does a 5'6 woman need to maintain weight? Complete calorie chart by age, weight, and activity level with exact macro formulas.
Read article →Need 150 to 160 grams of protein daily? Here is how to hit your protein target easily with whole foods, budget-friendly staples, and exact meal breakdowns.
Read article →No sign-up. Results in under 30 seconds. Your calculator entries stay on your device.
