Health and wellness Calculators: All 173 Tools
Every health and wellness calculator on CalculatorHub, 173 in total, listed alphabetically. Each one is free, works in your browser with no signup, and shows the method it uses. Where a result depends on an external rate, standard or dataset, the supporting source is shown on the page with the date it was last checked. Prefer to search across all 6,718 calculators? Use the tool finder.
- A-a Gradient Calculator (Alveolar-Arterial)
- Absolute Eosinophil Count Calculator (AEC)
- Absolute Neutrophil Count (ANC) Calculator
- Added Sugar % of Calories Calculator: Sugar vs Total Calories
- Adjusted Body Weight Calculator: ABW = IBW + 0.4(Actual - IBW)
- Alcohol Calories Calculator: kcal from Ethanol Plus Carbs
- Alcohol Unit Calculator
- Amniotic Fluid Index Calculator
- Animal Metabolic Rate (Kleiber) Calculator 2026: BMR from Body Mass
- Ankle-Brachial Index (ABI) Calculator: PAD Risk Assessment
- Ankle-Brachial Index Calculator (ABI)
- Anti-Inflammatory Diet Score Calculator
- APACHE II Score Calculator (ICU Severity)
- Bedtime Calculator
- Bioavailability Calculator: Oral vs IV AUC Comparison
- Biological Age Calculator: Estimate Your Body Age
- Bishop Score Calculator: Cervical Ripeness for Induction
- Blood Alcohol Content Calculator
- Blood Glucose Conversion Calculator: mg/dL to mmol/L
- Blood Pressure Calculator: Understand Your Readings
- BMI Calculator: Free Body Mass Index Calculator
- BMI for Children Calculator: BMI-for-Age Percentile (Ages 2-20)
- BMI Percentile Calculator for Children: CDC Growth Charts (Ages 2-19)
- BMI Prime Calculator: Your BMI Relative to Upper Normal
- BMR Calculator
- BMR Calculator (Mifflin-St Jeor): Basal Metabolic Rate
- Body Fat (US Navy) Calculator: Circumference Method
- Body Fat (YMCA) Calculator: Waist and Weight Method
- Body Fat Calculator 2026: US Navy Method Body Fat Percentage
- Body Fat Percentage Calculator
- Body Surface Area Calculator
- Body Water Percentage Calculator (Watson Formula)
- Bone Density T-Score Calculator: Osteoporosis Risk
- Caffeine Half-Life Calculator: How Long Does Caffeine Last?
- Caffeine Safety Calculator: Total mg vs FDA 400 mg/day Limit
- Calcium Intake Calculator: Daily Recommended Amount by Age and Sex
- Calcium RDA Calculator: Daily Intake vs NIH ODS Target by Age
- Calorie Calculator
- Calorie Deficit Calculator: Pounds Lost from Deficit
- Calories Burned Calculator
- Calories Burned Cycling Calculator 2026: MET-Based Estimate
- Calories Burned Running Calculator 2026: MET-Based Estimate
- Calories Burned Swimming Calculator 2026: MET-Based Estimate
- Calories Burned Walking Calculator 2026: MET-Based Estimate
- Caprini VTE Risk Score Calculator
- Carb Intake Calculator
- Cat Calorie Needs Calculator: Daily Energy Requirements
- Cerebral Perfusion Pressure Calculator: CPP = MAP - ICP
- Child and Teen BMI Percentile Calculator
- Cholesterol LDL/HDL Calculator: Lipid Panel Interpreter
- Cholesterol Ratio Calculator: TC/HDL and LDL/HDL Ratios
- Collagen Intake Calculator: Daily Needs for Skin, Joints, and Muscle
- Conception Date Calculator: Estimate When You Conceived
- Corticosteroid Equivalent Calculator: Potency Conversion
- Cycling Calories Calculator
- Daily Calorie Needs Calculator
- Daily Water Intake Calculator: mL by Weight and Activity
- Dog Calorie Needs Calculator: Daily Energy Requirements
- Dough Hydration Calculator 2026: Baker's Percentage of Water to Flour
- Dough Hydration Calculator: Bread Dough Hydration Percentage
- eGFR Calculator (CKD-EPI 2021 Creatinine)
- Electrolyte Replacement Calculator: Sweat Loss Replacement
- Estimated Average Glucose Calculator (eAG)
- Fat Intake Calculator
- Fat Per Serving Calculator: Total and Saturated Fat from Any Food
- FENa Calculator: Fractional Excretion of Sodium Formula
- Fetal Heart Rate Zone Calculator
- FIB-4 Liver Fibrosis Index Calculator
- Frame Size Calculator
- Gestational Age Calculator: Weeks and Days of Pregnancy
- Glycemic Load Calculator: GL from GI and Carbs
- Harris-Benedict BMR Calculator: Daily Calories
- HAS-BLED Bleeding Score Calculator
- HbA1c Calculator: Convert Between % and mmol/mol
- Head Circumference Percentile Calculator (CDC Growth Charts)
- Healthy Weight Range Calculator
- Hearing Frequency Range Calculator: Age-Related Hearing Loss
- HOMA-IR Insulin Resistance Calculator
- Hydration Needs Calculator: Daily Water Intake
- Ideal Body Weight (Devine) Calculator: IBW Formula
- Ideal Weight Calculator
- Implantation Window Calculator: When Does Implantation Occur?
- Infusion Rate Calculator: mcg/kg/min to mL/hr
- INR Calculator: International Normalised Ratio from PT
- Insulin Resistance Calculator: HOMA-IR Index
- Insulin-to-Carb Ratio Calculator (500 Rule)
- Intermittent Fasting Calculator: Eating and Fasting Windows
- Iron Intake Calculator: Daily Recommended Amount (NIH)
- Iron RDA Calculator: Daily Iron Intake vs NIH ODS Target
- IV Drip Rate Calculator: gtt/min from Volume and Time
- Jump Rope Calorie Calculator: Calories Burned Skipping
- Katz ADL Score Calculator: Independence Index
- Keto Macros Calculator: Carb, Protein, Fat for Ketogenic Diet
- LDL Cholesterol (Friedewald) Calculator
- LDL Cholesterol Calculator (Friedewald)
- Lean Body Mass Calculator: Boer and James Formula (kg)
- Life Expectancy Calculator: Estimate Your Longevity
- Lung Capacity Calculator: Predicted Total Lung Capacity
- Macro Calculator
- Macronutrient Calculator
- Macronutrient Ratio Calculator: Protein, Carb, Fat Split
- Magnesium Intake Calculator: Daily RDA by Age and Sex
- Maintenance Calorie Calculator
- Mammal Heart Rate Scaling Calculator 2026: Resting Beats per Minute
- Martial Arts Calorie Calculator: Calories Burned Training
- Maximum Heart Rate Calculator
- Meal Calorie Split Calculator: Distribute Calories Per Meal
- Meal Glycemic Index Calculator: Weighted GI by Carb Content
- Mean Arterial Pressure Calculator (MAP)
- Medication Half-Life Calculator: Time to Clear from Body
- Mentzer Index Calculator (MCV / RBC)
- MET Calorie Calculator
- Metabolic Equivalent (MET) Calculator: Calories Burned by Activity
- Muscle Mass Calculator: Estimate Skeletal Muscle Mass
- Nap Calculator
- Net Carbs Calculator: Total Carbs Minus Fibre
- Newborn Weight Percentile Calculator (CDC Growth Charts)
- Omega-3 Intake Calculator: Daily AI for EPA, DHA and ALA
- Osmolality Calculator: Calculated Serum Osmolality
- Pain Assessment Calculator: NRS and Brief Pain Inventory
- Peak Flow Calculator: Predicted Peak Expiratory Flow Rate
- Perceived Stress Score Calculator (PSS-10)
- Pet Blood Volume Calculator: Total and Safe Sampling Volume
- Pet Calorie Requirement Calculator 2026: Resting Energy (RER)
- Pet Dehydration Deficit Calculator: Fluid Replacement Volume
- Pet Resting Energy Requirement Calculator: RER and Daily Calories
- pH Calculator: Convert Between pH, pOH, and H+ Concentration
- Plasma Concentration-Time Calculator: C = C0 e^(-ke t)
- Ponderal Index Calculator: Mass / Height^3 Body Composition
- Potassium Intake Calculator: Daily Adequate Intake by Age
- Pregnancy Blood Volume Calculator: Estimated Plasma Expansion
- Protein Intake Calculator
- Protein Per Meal Calculator: Target Grams for Muscle Synthesis
- Protein Requirement by Goal Calculator: g/kg by Goal
- Protein Synthesis Rate Calculator: Fractional Synthetic Rate
- Race Time Predictor: Riegel Formula Finish Time Calculator
- Relative Fat Mass Calculator (RFM)
- Resting Metabolic Rate Calculator: Harris-Benedict Revised (RMR)
- Serum Osmolality Calculator: 2Na + Glucose/18 + BUN/2.8
- Shock Index Calculator: HR / Systolic BP Ratio
- Skinfold Body Fat Calculator: Jackson-Pollock 3-Site Method
- Smoking Cost Calculator: Annual and Lifetime Cost of Smoking
- Sodium Intake Calculator: Daily Salt and Sodium Limits
- Sodium-Potassium Ratio Calculator: Na to K Dietary Ratio
- Soluble Fiber Target Calculator: Daily Soluble Fiber Goal
- Sourdough Hydration Calculator: True Dough Hydration
- Sport Hydration Need Calculator: Sweat Rate and Fluid Needs
- Steps To Calories Calculator
- Steps To Distance Calculator
- Sweat Rate Calculator: Fluid Loss During Exercise
- Swimming Calories Calculator
- Target Heart Rate (Karvonen) Calculator 2026: Heart Rate Reserve
- TDEE Calculator: Daily Calorie Needs (Mifflin-St Jeor)
- Therapeutic Index Calculator: TD50 / ED50 Ratio
- Time to Steady State Calculator: ~5 Half-Lives
- Visceral Fat Calculator: Abdominal Fat Risk Assessment
- Vitamin B12 Intake Calculator: Daily Needs by Age and Diet
- Vitamin C RDA Calculator: Daily Intake vs NIH ODS Target
- Vitamin D Intake Calculator: Daily Recommended Amount (IU and mcg)
- VO2 Max Rockport Walk Calculator
- VO2 Max Rockport Walk Test Calculator: Cardiorespiratory Fitness
- Volume of Distribution Calculator: Vd = Dose / C0
- Waist Circumference Risk Calculator
- Waist-to-Height Ratio Calculator: Abdominal Obesity Risk
- Waist-to-Height Ratio Calculator: WHtR Health Risk Tool
- Waist-to-Hip Ratio Calculator
- Walking Calories Burned Calculator
- Water Intake Calculator
- Weight Goal Timeline Calculator: Weeks to Reach Target Weight
- Weight Loss Timeline Calculator
- Western Blot Protein Loading Calculator: Sample Prep from BCA/Bradford
- Yoga Calorie Burn Calculator: Calories Burned by Style
- Zinc Intake Calculator: Daily RDA and Upper Limit by Age