Health calculators help you understand numbers that matter for your body — from your BMI and daily calorie needs to pregnancy due dates and body fat percentage. These tools use established medical and fitness formulas referenced by the WHO, CDC, and NIH. They're designed for general reference and healthy habit tracking, not medical diagnosis.
The most-used tools here are the BMI Calculator, the TDEE Calculator (your total daily calorie burn), and the Calorie Calculator. All tools are free with no account required.
Weight & Body Composition
Body mass index with weight category
BMI ChartBMI with full category reference
BMI Calculator for WomenBMI with women-specific health context
Body Fat CalculatorEstimate body fat percentage
Ideal Weight CalculatorHealthy weight range for your height
Bra Size CalculatorFind your correct bra size
Calories & Nutrition
Daily calorie needs by goal
TDEE CalculatorTotal daily energy expenditure
BMR CalculatorCalories burned at rest
Basal Metabolic RateResting calorie burn (Mifflin-St Jeor)
Calorie Deficit CalculatorDaily calories for weight loss
Maintenance CaloriesCalories to maintain current weight
Macro CalculatorProtein, carbs, and fat targets
Water Intake CalculatorDaily hydration goal
Fitness & Exercise
Running pace, speed & finish time
Calories BurnedCalories burned by activity
Steps to CaloriesSteps walked to calories burned
Sleep CalculatorBest bedtime & wake time
BAC CalculatorBlood alcohol content estimate
Pregnancy & Reproductive Health