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BMI Calculator
Check your Body Mass Index and get personalised health insights instantly.
BMR Calculator
Find your basal metabolic rate for smarter nutrition planning.
TDEE Calculator
Total daily energy needs calibrated to your activity level.
Ideal Weight
Discover your healthy weight range based on your height and frame.
Body Fat Calculator
Estimate your body fat percentage with precision measurements.
Water Intake
Know your optimal daily hydration target in seconds.
Protein Calculator
Calculate your daily protein requirement for muscle & recovery.
Calories Burned
Track calories burned from dozens of different exercises.
Heart Rate Zones
Find your target heart rate zones for peak performance training.
Macro Calculator
Break down your ideal ratio of carbs, protein, and healthy fats.
Waist-to-Height Ratio
Assess metabolic health risks from simple body measurements.
Pregnancy Weight Gain
Track recommended gestational weight gain week by week.
Age Calculator
Check your exact age in years, months, and days.
Heart Attack Risk
Screen your cardiovascular risk factors and get actionable insights.
HbA1c Calculator
Estimate your 3-month average blood sugar from a glucose reading.
Calorie Calculator
Find exactly how many calories you should eat daily to reach your goal.
Lean Body Mass Calculator
Find your lean mass, fat mass, and LBM percentage using three formulas.
Army Body Fat Calculator
Check if you meet US Army AR 600-9 body fat standards by age and gender.
Keto Calculator
Get personalized fat, protein, and carb targets for a ketogenic diet.
Carb Calculator
Find your ideal daily carb intake for weight loss, maintenance, or muscle gain.
Due Date Calculator
Calculate your estimated due date from LMP, conception date, or IVF transfer.
Waist-to-Hip Ratio Calculator
Check your WHR against WHO risk categories for men and women.
Body Adiposity Index Calculator
Estimate body fat percentage from hip circumference and height — no scale needed.
Ponderal Index Calculator
A height-adjusted alternative to BMI, ideal for very tall or short individuals.
Simple Process
How It Works
From input to insight in under 30 seconds.
01
Choose a Calculator
Pick from 20+ science-backed tools covering BMI, nutrition, fitness and more.
02
Enter Your Details
Fill in a few quick metrics — height, weight, age, activity level. That's it.
03
Get Instant Results
Receive personalised, easy-to-understand results with guidance to act on them.
About Us
Built for Real People
HealthGyanHub provides free, accurate health and fitness calculators — built for everyone from beginners to athletes. No jargon, no paywalls. Just clear, actionable wellness data at your fingertips.
These calculators provide estimated results for informational purposes only. Always consult a qualified healthcare professional for personalised medical advice.