Health & Fitness Calculators
Take charge of your wellness with our 39 free health and fitness calculators. From tracking body metrics and nutrition to monitoring pregnancy milestones, optimizing fitness training, and assessing medical health indicators, these evidence-based tools give you instant, personalized insights with no signup required.
Body Metrics
View all →BMI Calculator
Calculate your Body Mass Index to determine if your weight is in a healthy range.
Body Fat Calculator
Estimate your body fat percentage using body measurements and proven formulas.
Ideal Weight Calculator
Find your ideal body weight based on height, gender, and multiple scientific formulas.
Lean Body Mass Calculator
Calculate your lean body mass to understand your body composition beyond just weight.
Body Surface Area Calculator
Calculate body surface area using height and weight for medical dosing calculations.
Body Type Calculator
Determine your body type (ectomorph, mesomorph, endomorph) based on your measurements.
Healthy Weight Calculator
Find the healthy weight range for your height and age based on medical guidelines.
Overweight Calculator
Check if you are overweight and calculate how much weight you need to lose for a healthy BMI.
Anorexic BMI Calculator
Check if your BMI falls in the underweight range and understand the health implications.
Height Calculator
Predict a child's adult height based on parent heights and current measurements.
Waist to Hip Ratio Calculator
Calculate your waist-to-hip ratio to assess health risks related to body fat distribution.
Bra Size Calculator
Find your correct bra size using band and bust measurements with international size charts.
Nutrition & Diet
View all →Calorie Calculator
Calculate your daily calorie needs for weight loss, maintenance, or muscle gain.
Macro Calculator
Calculate your ideal macronutrient ratios for protein, carbs, and fat based on your goals.
Protein Calculator
Determine your daily protein requirements based on weight, activity level, and fitness goals.
Carbohydrate Calculator
Calculate your optimal daily carbohydrate intake based on activity level and dietary goals.
Fat Intake Calculator
Calculate your recommended daily fat intake in grams based on calorie needs and diet type.
TDEE Calculator
Calculate your Total Daily Energy Expenditure to understand your daily calorie burn.
BMR Calculator
Calculate your Basal Metabolic Rate to find how many calories your body burns at rest.
Calories Burned Calculator
Estimate calories burned during exercise and daily activities based on duration and intensity.
Water Intake Calculator
Calculate your recommended daily water intake based on weight, activity, and climate.
Creatine Dosage Calculator
Calculate the optimal creatine loading and maintenance dose based on your body weight.
Pregnancy & Fertility
View all →Pregnancy Calculator
Track your pregnancy week by week and estimate key milestones and your due date.
Due Date Calculator
Calculate your estimated due date based on your last menstrual period or conception date.
Conception Calculator
Estimate your conception date based on your due date or last menstrual period.
Pregnancy Conception Calculator
Calculate when you likely conceived and find your most fertile days for family planning.
Ovulation Calculator
Predict your ovulation dates and fertile window to help with conception planning.
Period Calculator
Track and predict your menstrual cycle dates based on your average cycle length.
Pregnancy Weight Gain Calculator
Track healthy weight gain during pregnancy based on your pre-pregnancy BMI and trimester.
Baby Height Calculator
Predict your baby's future adult height based on parent heights and growth percentiles.
Baby Weight Calculator
Track your baby's weight against growth charts and WHO percentile standards.
Fitness
View all →Pace Calculator
Calculate your running or walking pace, speed, and finish time for any distance.
One Rep Max Calculator
Estimate your one-rep max for any lift using weight and reps from a recent set.
Target Heart Rate Calculator
Find your target heart rate zones for optimal fat burning and cardiovascular training.
Medical & Other
View all →GFR Calculator
Estimate your glomerular filtration rate to assess kidney function from creatinine levels.
BAC Calculator
Estimate your blood alcohol concentration based on drinks consumed, weight, and time.
Life Expectancy Calculator
Estimate your life expectancy based on lifestyle factors, health habits, and demographics.
Smoking Cost Calculator
Calculate how much money you spend on smoking and how much you could save by quitting.
Sleep Calculator
Find the best bedtime or wake-up time based on sleep cycles for optimal rest.
About Health & Fitness Calculators
Understanding your body's metrics is the foundation of any effective health and fitness plan. Our health calculators translate complex medical formulas into clear, actionable numbers you can use every day.
The Body Metrics category includes 12 calculators covering BMI, body fat percentage, ideal weight, lean body mass, body surface area, and more. These tools use WHO-endorsed formulas and clinically validated equations to help you understand your body composition from multiple angles.
Our Nutrition & Diet calculators provide 10 tools for calorie counting, macronutrient planning, and hydration tracking. The calorie and TDEE calculators use the Mifflin-St Jeor equation, while specialized tools for protein, carbohydrate, and fat intake help you fine-tune your diet for specific goals.
The Pregnancy & Fertility section offers 9 calculators for due date estimation, ovulation tracking, period prediction, and pregnancy weight gain monitoring. These tools use Naegele's rule and IOM guidelines to support expectant and planning parents.
Our Fitness calculators help athletes and active individuals calculate running pace, one-rep max for strength training, and target heart rate zones using the Karvonen formula. The Medical category covers kidney function (GFR), blood alcohol content, sleep cycle optimization, life expectancy estimation, and smoking cost analysis.
All health calculators on this page are designed for educational and informational purposes. They rely on peer-reviewed formulas and guidelines from organizations such as the CDC, WHO, and NIH. However, they are not a substitute for professional medical advice. Always consult your healthcare provider before making changes to your diet, exercise routine, or health plan.
Frequently Asked Questions
Are these health calculators medically accurate?
Our calculators use peer-reviewed formulas from recognized health organizations including the WHO, CDC, and NIH. While they provide reliable estimates, individual results can vary based on factors like muscle mass, genetics, and medical conditions. Always discuss results with your healthcare provider.
Can I use the BMI calculator for children?
The standard BMI calculator on this page is designed for adults aged 20 and older. BMI assessment for children and teens requires age- and sex-specific percentile charts. Consult your pediatrician for an accurate child BMI evaluation.
How accurate is the pregnancy due date calculation?
The pregnancy calculator estimates your due date based on the first day of your last menstrual period using Naegele's rule, the same method most obstetricians use initially. Ultrasound dating, typically performed in the first trimester, provides a more precise estimate.
Should I follow the calorie calculator results exactly?
The calorie calculator provides a science-based starting point. Your actual needs may differ based on metabolism, medical conditions, medications, and daily activity variations. Use the results as a guideline and adjust based on how your body responds over two to four weeks.