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Health & Fitness Calculators — Track Your Wellness

Health and fitness calculators for BMI, calories, body fat, and more.

321 calculators

Understanding your health begins with knowing your numbers. Our health calculators simplify complex medical formulas into clear, actionable advice—such as your BMI, daily calorie requirements, and macronutrient distribution. These tools are based on robust research and adhere to clinical guidelines trusted by healthcare providers. Simply input your information to receive immediate results. You’ll know exactly where you stand, set realistic goals, and monitor your progress along the way. Everything you need to make informed decisions about your diet and fitness is available right here.

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Body Metrics Calculators

Measure BMI, body fat percentage, ideal weight, and body surface area.

BMI Calculator Body Fat Calculator Ideal Weight Calculator

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General Health & Body Measurements

Explore our collection of General Health & Body Measurements for accurate calculations and conversions.

Anorexic BMI Calculator BMI Calculator (Body Mass Index)BMI Calculator for Kids (Children)BMI Calculator for Men BMI Calculator for Women View all 9 calculators

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Nutrition Calculators

Estimate daily caloric needs, macronutrient ratios, and meal planning.

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Body Fat & Muscle Calculators

Explore our collection of Body Fat & Muscle Calculators for accurate calculations and conversions.

Army Body Fat Calculator Body Adiposity Index (BAI) Calculator Body Fat Calculator Body Roundness Index (BRI) Calculator FFMI Calculator (Fat-Free Mass Index)View all 6 calculators

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Ideal Weight & Body Measurements

Explore our collection of Ideal Weight & Body Measurements for accurate calculations and conversions.

Adjusted Body Weight Calculator Body Frame Size Calculator Body Shape Calculator Body Surface Area (BSA) Calculator Ideal Body Weight (Devine Formula)View all 11 calculators

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Calorie & Metabolism Calculators

Explore our collection of Calorie & Metabolism Calculators for accurate calculations and conversions.

BMR Calculator (Basal Metabolic Rate)Calorie Calculator Calorie Deficit Calculator Calorie Surplus Calculator Calories Burned Calculator View all 12 calculators

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Macronutrient & Micronutrient Calculators

Explore our collection of Macronutrient & Micronutrient Calculators for accurate calculations and conversions.

Carb Calculator Fat Intake Calculator Fiber Calculator IIFYM Calculator Macro Calculator View all 10 calculators

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Water & Hydration Calculators

Explore our collection of Water & Hydration Calculators for accurate calculations and conversions.

Fluid Maintenance Calculator Free Water Deficit Calculator Hydration Calculator Total Body Water Calculator Water Intake Calculator

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Exercise & Performance Calculators

Explore our collection of Exercise & Performance Calculators for accurate calculations and conversions.

Bruce Protocol METs Calculator One Rep Max Calculator Running Calorie Calculator Step to Calories Calculator Step to KM Converter View all 8 calculators

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Heart Rate & Zone Calculators

Explore our collection of Heart Rate & Zone Calculators for accurate calculations and conversions.

Heart Rate Recovery Calculator Heart Rate Zone Calculator Target Heart Rate Calculator

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Cardiology Calculators - Cardiovascular Risk Calculators

Explore our collection of Cardiology Calculators - Cardiovascular Risk Calculators for accurate calculations and conversions.

ASCVD Risk Calculator (ACC/AHA)CHA₂DS₂-VASc Score CHADS2 Score EuroSCORE II Framingham Risk Score View all 11 calculators

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Blood Pressure & ECG Calculators

Explore our collection of Blood Pressure & ECG Calculators for accurate calculations and conversions.

Ankle-Brachial Index (ABI) Calculator Blood Pressure Percentile Calculator (Children)BP Average Calculator Corrected QT (Bazett, Fridericia, Framingham)ECG Heart Rate Calculator View all 8 calculators

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Lipid & Cholesterol Calculators

Explore our collection of Lipid & Cholesterol Calculators for accurate calculations and conversions.

Atherogenic Index Calculator Cholesterol Ratio Calculator LDL Calculator (Friedewald Equation)Non-HDL Cholesterol Calculator VLDL Calculator

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Pulmonology & Respiratory Calculators

Explore our collection of Pulmonology & Respiratory Calculators for accurate calculations and conversions.

A-a Gradient Calculator BODE Index (COPD)CURB-65 Score (Pneumonia Severity)FEV1/FVC Ratio Calculator Oxygenation Index Calculator View all 11 calculators

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Oxygen & Ventilation Calculators

Explore our collection of Oxygen & Ventilation Calculators for accurate calculations and conversions.

Alveolar Gas Equation Dead Space Calculator (Bohr Equation)Oxygen Consumption Calculator Oxygen Tank Duration Calculator Ventilator Settings Calculator

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Nephrology Calculators

Explore our collection of Nephrology Calculators for accurate calculations and conversions.

BUN/Creatinine Ratio Calculator Creatinine Clearance Calculator (Cockcroft-Gault)eGFR Calculator (CKD-EPI 2021)Fractional Excretion of Sodium (FENa)Fractional Excretion of Urea (FEUrea)View all 9 calculators

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Dialysis & Electrolyte Calculators

Explore our collection of Dialysis & Electrolyte Calculators for accurate calculations and conversions.

Anion Gap Calculator Corrected Calcium Calculator Corrected Magnesium Calculator Delta Ratio (Delta Gap) Calculator Kt/V Calculator (Dialysis Adequacy)View all 9 calculators

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Blood Cell & Anemia Calculators

Explore our collection of Blood Cell & Anemia Calculators for accurate calculations and conversions.

Absolute Lymphocyte Count (ALC)Absolute Neutrophil Count (ANC)Corrected Reticulocyte Count Iron Deficiency Calculator Mentzer Index Calculator View all 8 calculators

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Bleeding & Anticoagulation Calculators

Explore our collection of Bleeding & Anticoagulation Calculators for accurate calculations and conversions.

4T Score (HIT - Heparin-Induced Thrombocytopenia)Blood Loss Calculator Fresh Frozen Plasma Dose Calculator HEMORR₂HAGES Score INR Calculator View all 7 calculators

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Liver Disease Calculators

Explore our collection of Liver Disease Calculators for accurate calculations and conversions.

APRI Score (AST to Platelet Ratio Index)AST/ALT Ratio Calculator Child-Pugh Score FIB-4 Index (Liver Fibrosis)Lille Score (Alcoholic Hepatitis)View all 9 calculators

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Pancreas & Gastroenterology

Explore our collection of Pancreas & Gastroenterology for accurate calculations and conversions.

BISAP Score (Pancreatitis)Glasgow-Blatchford Bleeding Score Ranson's Criteria (Pancreatitis)Rockall Score (GI Bleeding)

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Neurology Calculators

Explore our collection of Neurology Calculators for accurate calculations and conversions.

ABCD2 Score (TIA)Canadian CT Head Rule DRAGON Score (Post-Thrombolysis)FOUR Score Glasgow Coma Scale (GCS)View all 10 calculators

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Epilepsy & Other Neurological Calculators

Explore our collection of Epilepsy & Other Neurological Calculators for accurate calculations and conversions.

Epworth Sleepiness Scale ICH Score ICH Volume Calculator (Intracerebral Hemorrhage)Mini-Mental State Examination (MMSE)Montreal Cognitive Assessment (MoCA)

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Emergency Medicine & Trauma Calculators

Explore our collection of Emergency Medicine & Trauma Calculators for accurate calculations and conversions.

Injury Severity Score (ISS)Parkland Formula (Burns)Pediatric Trauma Score Revised Trauma Score (RTS)Rule of Nines (Burns)View all 7 calculators

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Toxicology & Poisoning

Explore our collection of Toxicology & Poisoning for accurate calculations and conversions.

Alcohol Consumption Calculator Blood Alcohol Content (BAC) Calculator CIWA-Ar (Alcohol Withdrawal)Osmolal Gap Calculator Toxicology Calculator (Drug Half-Life)

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Sepsis & Critical Care

Explore our collection of Sepsis & Critical Care for accurate calculations and conversions.

APACHE II Score Mortality in Emergency Department Sepsis (MEDS)qSOFA Score SAPS II Score SOFA Score

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Pregnancy & Due Date Calculators

Explore our collection of Pregnancy & Due Date Calculators for accurate calculations and conversions.

Bishop Score Calculator Conception Date Calculator Due Date Calculator Fertility Calculator Gestational Age Calculator View all 11 calculators

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Gynecological Calculators

Explore our collection of Gynecological Calculators for accurate calculations and conversions.

Blatt-Kupperman Menopausal Index Clomid Ovulation Calculator Greene Climacteric Scale IVF Due Date Calculator Pregnancy Test Calculator View all 6 calculators

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Pediatrics Calculators - Child Growth & Development

Explore our collection of Pediatrics Calculators - Child Growth & Development for accurate calculations and conversions.

Adjusted Age Calculator (Preterm)APGAR Score Calculator Baby Percentile Calculator Ballard Score (Newborn Maturity)Birth Weight Percentile Calculator View all 8 calculators

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Pediatric Dosing & Medication

Explore our collection of Pediatric Dosing & Medication for accurate calculations and conversions.

Infant Tylenol Dosage Calculator Pediatric Amoxicillin Dosage Calculator Pediatric Blood Volume Calculator Pediatric Dose Calculator Pediatric Epinephrine Dose (Anaphylaxis)View all 8 calculators

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Neonatal Calculators

Explore our collection of Neonatal Calculators for accurate calculations and conversions.

Baby Calorie Intake Calculator Infant Formula Calculator Neonatal Abstinence Score (Finnegan)Newborn Bilirubin Calculator Newborn Weight Loss Calculator View all 6 calculators

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Endocrinology & Diabetes Calculators

Explore our collection of Endocrinology & Diabetes Calculators for accurate calculations and conversions.

A1C Calculator (HbA1c Converter)Blood Sugar mmol/L to mg/dL Converter Diabetes Risk Calculator Diabetic Ketoacidosis (DKA) Calculator Estimated Average Glucose (eAG) Calculator View all 10 calculators

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Thyroid & Hormone Calculators

Explore our collection of Thyroid & Hormone Calculators for accurate calculations and conversions.

Bioavailable Testosterone Calculator Calcium Infusion Calculator Cortisol Suppression Test Calculator FRAX Score (Fracture Risk)Free Testosterone Calculator View all 9 calculators

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Psychiatry & Psychology - Depression & Anxiety Scales Calculators

Explore our collection of Psychiatry & Psychology - Depression & Anxiety Scales Calculators for accurate calculations and conversions.

Beck Depression Inventory (BDI)Edinburgh Postnatal Depression Scale (EPDS)GAD-7 (Generalized Anxiety Disorder)Hamilton Depression Rating Scale (HAM-D)Montgomery-Åsberg Depression Rating Scale (MADRS)View all 7 calculators

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Psychiatric Assessment Tools

Explore our collection of Psychiatric Assessment Tools for accurate calculations and conversions.

AUDIT-C (Alcohol Use Disorders)CAGE Questionnaire (Alcohol)Fagerstrom Test for Nicotine Dependence Insomnia Severity Index (ISI)MDQ (Mood Disorder Questionnaire)View all 7 calculators

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Pharmacology & Drug Dosing Calculators

Explore our collection of Pharmacology & Drug Dosing Calculators for accurate calculations and conversions.

Aminoglycoside Dosing Calculator Carboplatin AUC Calculator Cisplatin Dosing Calculator Digoxin Dosing Calculator Heparin Dosing Calculator View all 13 calculators

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Prescription & Supply Calculators

Explore our collection of Prescription & Supply Calculators for accurate calculations and conversions.

Benzodiazepine Conversion Calculator Day Supply Calculator Drug Half-Life Calculator IV Drip Rate Calculator IV Flow Rate Calculator View all 8 calculators

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Dental Health Calculators

Explore our collection of Dental Health Calculators for accurate calculations and conversions.

Caries Risk Assessment Dental Dose Calculator Fluoride Dose Calculator Local Anesthetic Maximum Dose Pediatric Dental Dose Calculator View all 7 calculators

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Ophthalmology - Eye Health Calculators

Explore our collection of Ophthalmology - Eye Health Calculators for accurate calculations and conversions.

Contact Lens Base Curve Calculator Corneal Astigmatism Calculator Diopter to mm Converter Glaucoma Risk Calculator IOL Power Calculator (Intraocular Lens)View all 7 calculators

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Orthopedics & Rheumatology - Bone & Joint Calculators

Explore our collection of Orthopedics & Rheumatology - Bone & Joint Calculators for accurate calculations and conversions.

BASDAI (Ankylosing Spondylitis)Canadian C-Spine Rule DAS28 (Rheumatoid Arthritis)Gout Diagnosis Calculator NEXUS Criteria (C-spine)View all 9 calculators

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Health Risk Assessment & Quality of Life

Explore our collection of Health Risk Assessment & Quality of Life for accurate calculations and conversions.

Barthel Index (Activities of Daily Living)Braden Scale (Pressure Ulcer Risk)ECOG Performance Status Falls Risk Calculator Karnofsky Performance Status View all 10 calculators

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Oncology Risk & Prognosis Calculators

Explore our collection of Oncology Risk & Prognosis Calculators for accurate calculations and conversions.

Breast Cancer Risk Calculator (Gail Model)IPI24 (Lymphoma)IPSS-R (Myelodysplastic Syndrome)ISS (International Staging System for Myeloma)Lung Cancer Risk Calculator View all 10 calculators

Evidence-Based Health Metrics

If you want a strong base for your wellness plan, rely on real numbers instead of estimates. Use proven formulas like the Mifflin-St Jeor equation to determine your basal metabolic rate, or refer to the World Health Organization’s BMI guidelines for your baseline.

Body Mass Index (BMI)

BMI connects your weight and height. It doesn’t directly measure body fat, but it’s a fast way to identify potential weight-related health concerns. With our BMI calculator, you receive your result instantly—and you’ll learn what your number may indicate about your health.

Calorie & Macronutrient Tracking

Looking to lose weight? Build muscle? Just maintain? It all depends on your Total Daily Energy Expenditure (TDEE). Our calorie calculator uses your age, sex, weight, height, and activity level to estimate how many calories you burn each day. With this information, you can make more informed choices about your diet.

Common Health Metrics Explained

BMR — Basal Metabolic Rate: The number of calories your body needs at complete rest to sustain life—breathing, circulating blood, all the essentials.
TDEE — Total Daily Energy Expenditure: Your BMR, plus all the calories you use through daily activities and exercise.
Body Fat Percentage — The portion of your weight that is fat tissue. This provides more insight than BMI alone.
Waist-to-Hip Ratio — Assesses how your body stores fat, not just how much you have. It’s an important measure for heart health and applies regardless of your total weight.

A Note on Medical Advice

These tools help you understand your body, but they do not provide medical diagnoses. Before making significant changes to your diet or exercise routine, consult a qualified healthcare provider—especially if you have any existing health conditions.

Frequently Asked Questions

BMI is a useful population-level screening tool, but it has limitations for individuals. It does not distinguish between muscle and fat mass, so athletes may be classified as overweight despite low body fat. Use BMI as one data point alongside other metrics like body fat percentage, waist circumference, and blood work for a fuller picture of your health.

A safe and sustainable calorie deficit is typically 500 calories below your TDEE, which translates to roughly one pound of fat loss per week. Use our calorie calculator to find your TDEE, then subtract 500. Avoid dropping below 1,200 calories per day for women or 1,500 for men without medical supervision.

Healthy body fat ranges vary by sex and age. For men, 10—20% is generally considered healthy; for women, 18—28%. Athletes may be lower. Body fat that is too low can be just as harmful as too high, affecting hormone production and immune function.

Recalculate every 4—6 weeks or whenever your weight, activity level, or fitness goals change significantly. Your metabolic rate shifts as your body composition changes, so periodic recalculation keeps your targets aligned with your current physiology.

Basal Metabolic Rate (BMR) is the number of calories your body needs at rest to maintain basic functions like breathing and circulation — a key starting point for weight management or fitness plans. The Harris-Benedict formula estimates BMR as: For men, BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age in years); for women, BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age in years). Factors like age, sex, and muscle mass influence it. Use our free BMR calculator to input your details and get an accurate estimate instantly, then adjust for activity level to find your TDEE.

Daily water intake varies by factors like age, weight, activity level, climate, and diet, but a general guideline is 8–10 cups (2–2.5 liters) for adults — often called the "8x8 rule." More precisely, aim for half your body weight in ounces (e.g., 150 pounds = 75 ounces or about 2.2 liters), plus extra for exercise or hot weather. Dehydration can cause fatigue, headaches, or poor skin health, while overhydration is rare but possible. Track your needs with our hydration calculator, which factors in your weight, activity, and environment for a personalized recommendation.

A resting heart rate (RHR) measures your pulse when at complete rest, indicating cardiovascular health — typically 60–100 beats per minute (bpm) for adults. Athletes or very fit individuals often have lower RHR (40–60 bpm), while higher rates may signal stress, poor fitness, or health issues like anemia. To measure, count your pulse for 60 seconds in the morning before getting up. Use our heart rate calculator to log your RHR, compare it to norms by age and gender, and track changes over time for better insights into your fitness level.

Metabolism is the process of converting food to energy, and boosting it helps with weight control and energy levels — key methods include building muscle through strength training (muscle burns more calories at rest), eating protein-rich meals, staying hydrated, getting enough sleep (7–9 hours), and incorporating HIIT workouts. Avoid crash diets, as they slow metabolism long-term. Factors like age and genetics play a role, but lifestyle changes can increase it by 5–15%. Try our metabolism calculator to estimate your current rate and see how adjustments like adding exercise impact your daily calorie burn.