Calcula IMC, TDEE, calorías, macros y más — 100% gratis, privado e instantáneo.
Every key fitness metric — one tool, zero friction
Calculadora de IMC
Calcula tu Índice de Masa Corporal y encuentra tu rango de peso saludable.
Calculadora de TDEE
Calcula tu Gasto Energético Diario Total según tu nivel de actividad.
Calculadora de TMB
Encuentra tu Tasa Metabólica Basal — calorías quemadas en reposo.
Calculadora de Grasa Corporal
Estima tu porcentaje de grasa corporal usando múltiples métodos.
Calculadora de Peso Ideal
Encuentra tu rango de peso ideal según altura y complexión.
Calculadora de Calorías
Obtén tu objetivo calórico diario para perder, mantener o ganar peso.
Calculadora de Macros
Calcula las proporciones óptimas de proteínas, carbohidratos y grasas.
Calculadora de Agua
Calcula tu ingesta diaria de agua según peso y actividad.
Calculadora de Zonas Cardíacas
Encuentra tus zonas de frecuencia cardíaca para cardio óptimo.
Calculadora de Masa Magra
Calcula tu masa corporal magra y peso libre de grasa.
Calculadora de 1RM
Estima tu repetición máxima para cualquier ejercicio principal.
Calculadora de Proteínas
Encuentra tu ingesta diaria de proteínas para ganancia muscular.
Calculadora de Sueño
Encuentra horarios óptimos de sueño según ciclos de sueño.
Calculadora de Deuda de Sueño
Calcula tu deuda de sueño acumulada y plan de recuperación.
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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.
