Health
Free health calculators for BMI, daily calories, ideal weight, body fat, water intake, and fitness tracking. Science-based formulas for your wellness.
BMI Calculator
Calculate your Body Mass Index
Height Calculator
Predict a child's adult height and check the CDC percentile
Calorie Calculator
Calculate daily calorie needs
Ideal Weight Calculator
Find your ideal body weight for your height
Body Fat Calculator
Estimate body fat % with a tape measure
Body Shape Calculator
Determine your body shape from measurements
Creatinine Clearance Calculator
Estimate kidney function with the Cockcroft-Gault CrCl equation
GFR Calculator
Calculate eGFR with the CKD-EPI 2021 equation
IVF Due Date Calculator
Estimate your IVF baby's due date from your embryo transfer date
Water Intake Calculator
Calculate daily water needs
BMR Calculator
Calculate your Basal Metabolic Rate
TDEE Calculator
Calculate your Total Daily Energy Expenditure
Pregnancy Due Date Calculator
Calculate your baby's due date
Ovulation Calculator
Track your fertile window and ovulation
Period Calculator
Predict your next period, ovulation, and fertile window from your cycle
VO2 Max Calculator
Estimate your VO2 max and see your fitness level ranked by age and sex
Macro Calculator
Calculate your daily macronutrient needs
Protein Calculator
How much protein you need per day by weight, activity, and goal
Body Surface Area Calculator
Calculate BSA using medical formulas
Blood Alcohol Calculator
Estimate blood alcohol content
Pregnancy Week Calculator
Track your current pregnancy week
Conception Calculator
Estimate your conception date
Heart Rate Zone Calculator
Calculate your training heart rate zones
Peptide Calculator
Calculate peptide reconstitution and dosage
A1C Calculator
Convert A1C to blood sugar and vice versa
FFMI Calculator
Calculate your Fat-Free Mass Index and muscular development level
Starbucks Calorie Calculator
Calculate calories in Starbucks drinks
Calorie Deficit Calculator
Find your daily calories to lose weight, with a safe deficit and timeline
Free Online Health Calculators
Take control of your health with our free health and fitness calculators. Calculate your BMI, estimate daily calorie needs, track fitness metrics, and make informed decisions about your wellness journey. All calculations are private and happen entirely in your browser.
Why Use Our Health Calculators?
Evidence-Based Formulas
Our calculators use scientifically validated formulas like the Mifflin-St Jeor equation for BMR and WHO standards for BMI.
Personalized Results
Enter your specific details - age, height, weight, activity level - to get calculations tailored to your body and lifestyle.
Privacy First
Your health data is sensitive. That's why all calculations happen locally in your browser - we never see or store your information.
Easy to Understand
Results come with clear explanations of what the numbers mean and how they relate to your health goals.
Track Your Progress
Use our calculators regularly to monitor changes as you work toward your fitness and wellness goals.
Metric & Imperial Units
Switch between metric (kg, cm) and imperial (lbs, inches) units based on your preference.
How to Use Health Calculators
Select the health calculator that matches your goal - BMI assessment, calorie needs, or fitness tracking.
Enter your personal information such as age, gender, height, weight, and activity level as required.
Review your personalized results along with explanations of what the numbers mean for your health.
Use the recommendations to inform your diet and exercise decisions, but remember to consult healthcare providers for medical advice.
Return regularly to track your progress and adjust your goals as your fitness level changes.
Common Use Cases
Weight Management
Calculate your BMI and daily calorie needs to create a sustainable plan for weight loss or weight gain.
Fitness Planning
Determine how many calories you need based on your activity level and fitness goals.
Health Monitoring
Regularly check your BMI and other metrics to track your progress over time.
Nutrition Planning
Understand your macronutrient needs and plan meals that support your health goals.
Frequently Asked Questions
Our calculators use scientifically validated formulas and provide good estimates for most adults. However, individual results can vary based on factors like muscle mass, genetics, and health conditions. Always consult healthcare professionals for medical advice.