Body
BMI Calculator
Compute Body Mass Index from weight in kilograms and height in meters or centimeters. Educational screening metric only—not a diagnosis.
All health calculators
25 tools for wellness checks and training math
Metabolism
Calorie Calculator
Estimate total daily energy expenditure (maintenance calories) from age, sex, height, weight, and typical activity—using Mifflin–St Jeor BMR × standard activity multipliers.
Metabolism
BMR Calculator
Estimate basal metabolic rate (calories at rest) from weight, height, age, and sex using the Mifflin–St Jeor equation—common in apps and coaching tools.
Body
Body Fat Calculator
Estimate body fat percentage from weight, height, age, and sex using a BMI-based regression model—useful for trends, not a lab replacement.
Body
Ideal Weight Calculator
Estimate ideal body weight using height-based formula.
Metabolism
Water Intake Calculator
Estimate daily water intake from body weight.
Women's health
Pregnancy Calculator
Estimate due date based on last menstrual period.
Women's health
Ovulation Calculator
Estimate ovulation day from average cycle length.
Fitness
Heart Rate Calculator
Estimate target heart rate using age and workout intensity.
Body
Lean Body Mass Calculator
Estimate lean body mass using total weight and body fat percentage.
Body
Waist to Hip Ratio Calculator
Calculate waist-to-hip ratio from waist and hip measurements.
Metabolism
Macro Calculator
Estimate daily macro calorie totals from protein, carbs, and fats.
Metabolism
TDEE Calculator
Estimate total daily energy expenditure.
Metabolism
Protein Intake Calculator
Estimate daily protein needs based on body weight.
Body
BMI Prime Calculator
Calculate BMI prime score from BMI value.
Vitals
Heart Risk Score Calculator
Estimate a simple heart risk score from core markers.
Vitals
Body Water Calculator
Estimate total body water from body weight.
Body
Visceral Fat Estimate Calculator
Estimate an abdominal adiposity proxy score from gender, age, weight, height, waist, and thigh circumferences. For education only; not a medical diagnosis.
Fitness
One Rep Max Calculator
Estimate one-rep max from lifted weight and repetitions.
Fitness
Running Pace Calculator
Calculate running or walking pace.
Fitness
VO2 Max Calculator
Estimate VO2 max from 12-minute test distance.
Vitals
MAP Calculator
Calculate mean arterial pressure from blood pressure values.
Metabolism
Glycemic Load Calculator
Estimate glycemic load from GI and carbohydrate grams.
Sleep
Sleep Cycle Calculator
Estimate optimal wake time using sleep cycles.
Body
Target Weight Time Calculator
Estimate time needed to reach target body weight.