Health & Fitness Calculators
BMI, nutrition, exercise physiology, body composition, clinical, and wellness calculators.
BMI Calculator
Calculate your Body Mass Index (BMI) to assess if your weight is healthy for your height.
BMR Calculator
Calculate your Basal Metabolic Rate -- the number of calories your body burns at rest using the Mifflin-St Jeor equation.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method based on body measurements.
Ideal Weight Calculator
Calculate your ideal body weight using the Devine formula based on your height.
Calorie Needs Calculator
Calculate your daily calorie needs based on age, weight, height, and activity level using the Mifflin-St Jeor equation.
Macro Nutrient Calculator
Calculate your daily protein, carbohydrate, and fat intake in grams based on your calorie target and macro split.
Protein Intake Calculator
Calculate your recommended daily protein intake based on body weight and activity level.
Water Intake Calculator
Calculate how much water you should drink daily based on your body weight.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) based on BMR and activity level.
Heart Rate Calculator
Calculate your maximum heart rate and training heart rate zones based on your age.
Target Heart Rate Calculator
Calculate your target heart rate for exercise using the Karvonen formula, which accounts for your resting heart rate.
Running Pace Calculator
Calculate your running pace per mile based on total time and distance.
Cycling Speed Calculator
Calculate your average cycling speed based on distance and time.
Swimming Pace Calculator
Calculate your swimming pace per 100 meters or per lap based on total time and distance.
Lean Body Mass Calculator
Calculate your lean body mass (fat-free mass) based on your weight and body fat percentage.
Pregnancy Due Date Calculator
Estimate your pregnancy due date and remaining time based on how many weeks pregnant you are. A typical pregnancy lasts 40 weeks (280 days).
Ovulation Calculator
Estimate your ovulation day and fertile window based on your menstrual cycle length.
Sleep Cycle Calculator
Calculate optimal bedtimes based on your wake-up time and 90-minute sleep cycles. Waking at the end of a cycle helps you feel more rested.
Hydration Calculator
Calculate your recommended daily water intake based on weight and activity level using the metric formula.
Waist to Hip Ratio Calculator
Calculate your waist-to-hip ratio (WHR), a key indicator of health risk related to excess abdominal fat.
Healthy Weight Range Calculator
Calculate the healthy weight range for your height based on BMI guidelines (18.5 to 24.9).
Calories Burned Calculator
Calculate calories burned during exercise using MET values, body weight, and duration.
Step Distance Calculator
Calculate the distance covered based on number of steps and your stride length.
Walking Pace Calculator
Calculate your walking pace and speed based on distance and time.
Marathon Time Predictor
Predict your marathon finish time based on a shorter race result using the Riegel formula.
VO2 Max Calculator
Estimate your VO2 max (maximal oxygen uptake) using the Cooper test -- a 12-minute run test.
One Rep Max Calculator
Estimate your one-rep max (1RM) for any lift using the Brzycki formula based on weight and reps performed.
Muscle Gain Calculator
Estimate your daily calorie and protein needs for muscle building based on body weight and activity level.
Weight Loss Calculator
Calculate your expected weight loss rate based on daily caloric deficit. 3,500 calories equals approximately 1 pound of body fat.
Body Fat Percentage Calculator (BMI Method)
Estimate your body fat percentage using the BMI-based method. This formula uses your BMI and age to estimate body fat.
Daily Protein Needs Calculator
Determine how many grams of protein you should consume each day based on your body weight and activity level.
Daily Fiber Intake Calculator
Estimate your recommended daily fiber intake based on your calorie consumption following dietary guidelines.
Vitamin D Needs Calculator
Estimate your daily vitamin D requirement based on age, sun exposure, and body weight.
Iron Intake Calculator
Calculate your recommended daily iron intake based on age and dietary pattern.
Calcium Needs Calculator
Determine your recommended daily calcium intake based on age, with guidance on meeting your target through diet.
Sodium Limit Calculator
Calculate your recommended sodium limit and see how your current intake compares to health guidelines.
Sugar Limit Calculator
Calculate your maximum recommended daily added sugar intake based on your calorie level.
Cholesterol Ratio Calculator
Calculate your total-to-HDL cholesterol ratio and LDL cholesterol using the Friedewald equation.
Potassium Needs Calculator
Estimate your daily potassium requirement based on age and see how common foods contribute to your target.
Magnesium Needs Calculator
Calculate your recommended daily magnesium intake based on age.
VO2 Max Estimator (Cooper Test)
Estimate your VO2 max from a 12-minute run distance using the Cooper test formula.
Heart Rate Training Zones Calculator
Calculate your five heart rate training zones using the Karvonen method for optimized workout intensity.
Training Load Calculator (TRIMP)
Calculate your session training load using the TRIMP (Training Impulse) method based on duration and heart rate.
Running Calorie Burn Calculator
Estimate calories burned during a run using the MET method based on speed, body weight, and duration.
Cycling Calorie Burn Calculator
Estimate calories burned while cycling using MET values based on intensity, body weight, and duration.
Swimming Calorie Burn Calculator
Estimate calories burned while swimming based on stroke type, body weight, and duration.
METs Activity Calculator
Calculate calories burned for any activity using its MET (Metabolic Equivalent of Task) value.
Exercise Intensity Calculator
Evaluate your workout intensity as a percentage of maximum heart rate and heart rate reserve.
Recovery Time Estimator
Estimate your post-workout recovery time based on session intensity, duration, and training experience.
Overtraining Risk Score
Assess your overtraining risk by comparing weekly training load to your recent training history.
Lean Body Mass (Boer Formula)
Calculate lean body mass using the Boer formula based on height and weight without needing body fat percentage.
Skeletal Muscle Mass Estimator
Estimate your skeletal muscle mass as a percentage of total body weight based on age and body composition.
Visceral Fat Estimate
Estimate your visceral fat level using waist circumference, age, and BMI as proxy indicators.
Body Water Percentage Calculator
Estimate your total body water percentage using the Watson formula based on height, weight, and age.
Bone Density T-Score Interpreter
Interpret your bone density T-score and estimate fracture risk using a simplified FRAX-like model.
Skinfold Body Fat Calculator (3-Site)
Estimate body fat percentage using the Jackson-Pollock 3-site skinfold method for males.
Bioimpedance Body Composition Estimator
Estimate body composition metrics from bioimpedance scale readings, providing context for your results.
Android/Gynoid Fat Ratio Calculator
Calculate the ratio of upper-body (android) to lower-body (gynoid) fat distribution using waist and hip measurements.
Waist-to-Hip Ratio (Advanced)
Calculate your waist-to-hip ratio with health risk classification and waist-to-height ratio as a secondary measure.
Body Surface Area Calculator
Calculate your body surface area using the Mosteller formula, commonly used for medication dosing.
Pregnancy Due Date Calculator (Naegele)
Estimate your pregnancy due date and current gestational week using Naegele's rule from the first day of your last menstrual period.
Ovulation Calculator (Cycle-Adjusted)
Estimate your ovulation day and fertile window based on your average cycle length, adjusted for cycles that differ from 28 days.
Pregnancy Weight Gain Calculator
Calculate recommended pregnancy weight gain based on pre-pregnancy BMI following IOM guidelines.
Breastfeeding Calorie Calculator
Estimate additional calorie needs for breastfeeding mothers based on nursing frequency and activity level.
Menstrual Cycle Length Tracker
Track your menstrual cycle length and predict your next period, ovulation, and PMS window.
Fertility Window Calculator
Calculate your most fertile days and peak fertility based on cycle length for conception planning.
Prenatal Vitamin Needs Calculator
Calculate recommended daily intake of key nutrients during pregnancy based on trimester.
Gestational Diabetes Risk Calculator
Estimate your risk of gestational diabetes based on common risk factors including BMI, age, and family history.
Preeclampsia Risk Calculator
Estimate your risk of preeclampsia based on established maternal risk factors.
Postpartum Calorie Needs Calculator
Calculate daily calorie needs after pregnancy based on activity level and whether you are breastfeeding.
Blood Alcohol Content Calculator
Estimate your blood alcohol content (BAC) using the Widmark formula based on drinks consumed, body weight, and time.
Creatinine Clearance Calculator (Cockcroft-Gault)
Estimate kidney function using the Cockcroft-Gault equation for creatinine clearance.
Anion Gap Calculator
Calculate the serum anion gap from basic metabolic panel values to help identify metabolic acidosis causes.
Corrected Calcium Calculator
Calculate albumin-corrected serum calcium to account for low protein levels.
Pediatric BMI Percentile Calculator
Calculate BMI for children and teens and compare to age-based percentile ranges for weight status assessment.
Pediatric Dosing Calculator (Weight-Based)
Calculate weight-based medication doses for children using mg/kg dosing.
Adjusted Body Weight Calculator
Calculate ideal body weight and adjusted body weight for medication dosing in obese patients.
Glasgow Coma Scale Calculator
Calculate the Glasgow Coma Scale (GCS) score from eye, verbal, and motor responses for neurological assessment.
Simplified APACHE II Score Calculator
Calculate a simplified APACHE II severity score using age, temperature, heart rate, and GCS for ICU patients.
Wells Score Calculator (DVT)
Calculate the Wells score for estimating the probability of deep vein thrombosis (DVT).
Sleep Cycle Planner
Plan your wake-up time based on 90-minute sleep cycles to avoid waking during deep sleep and feel more refreshed.
Sleep Debt Calculator
Calculate your accumulated sleep debt by comparing actual sleep to your needed amount over a week.
Circadian Rhythm Calculator
Estimate your optimal sleep, wake, and peak performance times based on your chronotype.
Stress Level Score
Estimate your current stress level based on common stress indicators including sleep, workload, and physical symptoms.
Anxiety Screening Score (GAD-7 Simplified)
A simplified anxiety screening inspired by the GAD-7 questionnaire. Rate how often you have experienced common anxiety symptoms in the past two weeks.
Depression Screening Score (PHQ-Simplified)
A simplified depression screening inspired by the PHQ-9. Rate how often you have experienced common symptoms over the past two weeks.
Cognitive Load Estimator
Estimate your current cognitive load based on task complexity, multitasking, and fatigue level.
Reaction Time Estimator
Estimate how your reaction time is affected by sleep, caffeine, age, and fatigue compared to a baseline.
Meditation Session Calculator
Calculate recommended meditation duration and weekly target based on your experience level and available time.
Screen Time Impact Calculator
Estimate the health impact of your daily screen time including eye strain, sleep disruption, and sedentary hours.
Daily Steps Goal Calculator
Calculate a personalized daily steps goal and estimate calories burned from walking based on your age, weight, and fitness level.
Hydration Tracker Calculator
Track daily water intake against your hydration goal, adjusted for exercise and climate.
Posture Risk Score
Estimate your posture-related risk score based on sitting habits, stretching frequency, and workstation setup.
Ergonomic Desk Height Calculator
Calculate the optimal desk height, chair height, and monitor position based on your body measurements.
Eye Strain Break Timer
Calculate how many eye breaks you need per day based on screen time, following the 20-20-20 rule.
Stretching Interval Calculator
Calculate how often you should stretch during long sitting sessions and how much total stretching you need per day.
Standing Desk Sit/Stand Ratio
Calculate optimal sitting and standing intervals for a sit-stand desk based on research recommendations.
Walking Meeting Calorie Calculator
Calculate how many extra calories you burn by taking meetings while walking instead of sitting.
Stair Climbing Calorie Calculator
Calculate calories burned climbing stairs based on the number of flights, body weight, and climbing pace.
Gardening Calorie Calculator
Estimate calories burned during various gardening activities based on body weight and duration.