Health Calculators
8 free tools — pick one to get started.
BMI Calculator
Calculate Body Mass Index from weight and height. Get your category (underweight/normal/overweight/obese).
BMR Calculator
Calculate Basal Metabolic Rate using the Mifflin-St Jeor equation.
TDEE Calculator
Calculate Total Daily Energy Expenditure based on BMR and activity level.
Body Fat Calculator (US Navy)
Estimate body fat percentage using the US Navy circumference method.
Calorie Calculator
Calculate daily calorie target for weight loss, maintenance, or gain.
Ideal Weight Calculator
Calculate ideal body weight using four established formulas (Devine, Robinson, Miller, Hamwi).
Water Intake Calculator
Estimate daily water intake based on body weight and exercise duration.
Heart Rate Zone Calculator
Calculate the five heart rate training zones based on your age-predicted maximum.