Health Tools
Free online health calculators — BMI, BMR, calorie, heart rate, and fitness tracking tools.
Health calculators give you quick insights into your body and fitness without expensive equipment or clinic visits. Calculate your BMI to understand your weight category, determine your BMR to know how many calories you burn at rest, estimate daily calorie needs, find your target heart rate zone for exercise, and track body fat percentage. These tools are used by fitness enthusiasts, people starting a health journey, nutritionists recommending quick assessments, and anyone curious about their health metrics. All processing happens in your browser — your health data is never stored or transmitted.
BMI Calculator
Calculate your Body Mass Index with height/weight inputs in metric or imperial units.
BMR Calculator
Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation.
Calories Calculator
Estimate daily calorie needs based on activity level, age, and goals.
Water Intake Calculator
Calculate recommended daily water intake based on weight and activity.
Body Fat Calculator
Estimate body fat percentage using measurement-based methods.
Pregnancy Calculator
Calculate pregnancy due date, trimester dates, and fetal development milestones.
Due Date Calculator
Calculate estimated due date from last menstrual period or conception date.
Heart Rate Calculator
Calculate target heart rate zones for exercise based on age and fitness level.
Ideal Weight Calculator
Calculate ideal body weight range based on height using multiple formulas.
Ovulation Calculator
Calculate ovulation and fertile window dates for family planning.
Macro Calculator
Calculate optimal macronutrient distribution for your diet goals.
TDEE Calculator
Calculate Total Daily Energy Expenditure with activity level multipliers.
Frequently Asked Questions
Are these health calculators medically accurate?
Our calculators use well-established formulas (WHO BMI categories, Mifflin-St Jeor for BMR, etc.) and are suitable for general health awareness. They're not a substitute for professional medical advice or diagnosis.
Is my health data private?
Completely. All calculations happen in your browser. No health data is ever sent to a server or stored anywhere. Your body metrics stay on your device.
Can I use these for fitness planning?
Yes. BMR, calorie, and heart rate calculators are especially useful for building exercise and nutrition plans. They help you understand your body's energy needs and optimal workout intensity.