Health Calculators
Browse our comprehensive collection of health calculators for BMI, calories, fitness, heart rate, diabetes, pregnancy, sleep, and more. Free online tools for wellness, fitness, and medical professionals.
BMI Calculator
Calculate Body Mass Index from height and weight with category classification and health risk assessment.
bodyBody Fat Percentage Calculator
Estimate body fat percentage from circumference measurements (Navy method) with body composition analysis.
bodyWaist-to-Hip Ratio Calculator
Calculate waist-to-hip ratio and assess health risk based on body fat distribution.
bodyIdeal Weight Calculator
Calculate ideal body weight using Robinson, Miller, Devine, and Hamwi formulas.
bodyLean Body Mass Calculator
Calculate lean body mass (LBM) and fat-free mass index from weight and body fat percentage.
bodyBody Shape Calculator
Determine body shape (pear, apple, hourglass, etc.) from bust, waist, and hip measurements.
bodyWaist-to-Height Ratio Calculator
Calculate waist-to-height ratio for cardiovascular risk assessment.
bodyBody Surface Area Calculator
Calculate body surface area (BSA) using Du Bois, Mosteller, and Haycock formulas.
bodyCalorie Calculator (BMR + TDEE)
Calculate daily calorie needs using BMR (Mifflin-St Jeor) and activity multipliers.
caloriesMacronutrient Calculator
Calculate recommended daily protein, carbs, and fat intake based on calories and goals.
caloriesWeight Loss Calculator
Project weight loss timeline and calorie deficit needed for target weight goals.
caloriesFood Calorie Tracker
Track daily calories from common foods with nutritional database integration.
caloriesBasal Metabolic Rate (BMR)
Calculate BMR using Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle formulas.
caloriesCalories Burned Calculator
Estimate calories burned during exercise based on MET values and duration.
caloriesWater Intake Calculator
Calculate recommended daily water intake based on weight, activity, and climate.
caloriesNutrition Label Calculator
Create nutrition labels from ingredient information and serving sizes.
caloriesOne Rep Max (1RM) Calculator
Estimate your one-rep maximum for weightlifting from a sub-maximal lift.
fitnessVO2 Max Calculator
Estimate maximal oxygen consumption from resting heart rate and fitness tests.
fitnessPace Calculator
Calculate running pace, speed, and finish time for races and training.
fitnessCalories Burned by Activity
Calculate calories burned for various exercises and physical activities.
fitnessFitness Age Calculator
Calculate your fitness age based on VO2 max and compare to chronological age.
fitnessBMI Percentile Calculator
Calculate BMI percentile based on age and sex for children and teens.
fitnessBody Fat Navy Method
Estimate body fat percentage using the U.S. Navy circumference method.
fitnessWorkout Volume Calculator
Calculate total workout volume (sets × reps × weight) for training tracking.
fitnessMaximum Heart Rate Calculator
Calculate max heart rate using age-based formulas (Tanaka, Fox, and more).
heartTarget Heart Rate Zone Calculator
Calculate target heart rate zones for cardio training and fat burning.
heartKarvonen Heart Rate Calculator
Calculate training heart rate using the Karvonen formula with resting heart rate.
heartBlood Pressure Category Check
Check blood pressure readings against AHA categories (normal, elevated, hypertension).
heartHeart Rate Reserve Calculator
Calculate heart rate reserve for cardiovascular fitness assessment.
heartCardiovascular Risk Score
Estimate 10-year cardiovascular risk based on Framingham or ASCVD score.
heartRecovery Heart Rate Calculator
Assess cardiovascular fitness from heart rate recovery after exercise.
heartStroke Volume Calculator
Calculate stroke volume from cardiac output and heart rate.
heartHbA1c Average Blood Sugar
Convert between HbA1c percentage and estimated average glucose (eAG) in mg/dL or mmol/L.
diabetesBlood Sugar Converter
Convert blood glucose levels between mg/dL and mmol/L with scale guidance.
diabetesDiabetes Risk Assessment
Assess risk of type 2 diabetes based on lifestyle, family history, and health factors.
diabetesGMI Calculator (Glucose Management)
Calculate Glucose Management Indicator from average glucose levels.
diabetesCarbohydrate Intake Estimator
Estimate carbohydrate needs based on activity level and diabetes management.
diabetesInsulin Sensitivity Check
Estimate insulin sensitivity using HOMA-IR or QUICKI formulas.
diabetesMetabolic Syndrome Risk
Check for metabolic syndrome criteria based on cholesterol, BP, glucose, and waist.
diabetesPrediabetes Risk Calculator
Assess prediabetes risk using A1C, fasting glucose, and risk factors.
diabetesDue Date Calculator
Calculate estimated due date based on last menstrual period or conception date.
pregnancyFertility Calendar / Ovulation Calculator
Predict ovulation dates and fertile window based on cycle length.
pregnancyPregnancy Weight Gain Calculator
Track healthy weight gain during pregnancy based on pre-pregnancy BMI.
pregnancyConception Date Finder
Estimate conception date from due date or LMP.
pregnancyGestational Age Calculator
Calculate current gestational age from LMP or ultrasound dating.
pregnancyBaby Due Date from Conception
Calculate due date from known conception date.
pregnancyIVF Due Date Calculator
Calculate due date for IVF pregnancies based on transfer date.
pregnancyBaby Growth Percentile
Estimate baby growth percentile from gestational age and weight/height.
pregnancySleep Cycle Calculator
Calculate optimal wake time or bedtime based on 90-minute sleep cycles.
sleepSleep Debt Calculator
Calculate sleep debt and recovery sleep needed.
sleepStress Level Assessment
Assess stress levels based on lifestyle, work, and health factors.
sleepHydration Calculator
Calculate daily fluid needs based on weight, activity, and climate.
sleepStress & Burnout Risk
Assess burnout risk from lifestyle factors and work-life balance.
sleepWellness Score Calculator
Calculate overall wellness score based on sleep, diet, exercise, and stress.
sleepCircadian Rhythm Check
Assess circadian rhythm alignment with sleep-wake patterns.
sleepMeditation Session Planner
Plan meditation duration and frequency for mental wellness.
sleepLDL Cholesterol Calculator
Calculate LDL cholesterol using Friedewald equation from total cholesterol and triglycerides.
medicalHeart Disease Risk Score
Assess 10-year heart disease risk using major risk factors.
medicalGFR (Kidney Function) Calculator
Calculate estimated GFR using CKD-EPI or MDRD formulas.
medicalAnion Gap Calculator
Calculate anion gap for metabolic acidosis assessment.
medicalOsmolality Calculator
Calculate serum osmolality from sodium, glucose, and BUN.
medicalStroke Risk Assessment
Assess stroke risk based on lifestyle, medical history, and health factors.
medicalBUN/Creatinine Ratio
Calculate BUN/Creatinine ratio for kidney function assessment.
medicalHealth Age Calculator
Calculate health age based on lifestyle, BMI, and health metrics.
medicalWhat Are Health Calculators?
Our Health Calculators collection provides essential tools for tracking wellness, managing health conditions, and achieving fitness goals. Whether you're calculating BMI, tracking calories, checking heart rate zones, managing diabetes, or planning pregnancy, these calculators deliver accurate results with clear, actionable insights.
From body composition analysis and calorie tracking to heart rate monitoring, diabetes management, and pregnancy planning, our tools cover the full spectrum of health and wellness.
How to Use This Directory
- Search: Type a keyword into the search bar to find specific calculators by name or description.
- Filter by Category: Use the dropdown to narrow down to a specific health topic — each option shows the number of calculators available.
- Click to Use: Each card links directly to the tool. Click on any card to start your health assessment instantly.
- Explore Category Pages: Use the "Explore All Health Calculator Categories" section to access dedicated pages with even more tools.
Why Use Our Health Calculators?
- Comprehensive Coverage: Covers body composition, calories, fitness, heart rate, diabetes, pregnancy, sleep, and medical risk assessment.
- Accurate & Reliable: Uses clinically-validated formulas and medical guidelines.
- Free & Accessible: No registration, no fees — use any tool instantly on any device.
- Educational: Many tools explain the formulas and health principles behind the results.
- Professional & Personal Use: Designed for health professionals, fitness enthusiasts, and individuals monitoring their health.
❓ Health Calculators FAQ
What types of health calculations can I perform?
You can calculate BMI, body fat percentage, waist-to-hip ratio, ideal weight, BMR, daily calorie needs, macronutrient targets, weight loss projections, heart rate zones, VO2 max, diabetes risk, blood sugar conversions, due dates, ovulation, pregnancy weight gain, sleep cycles, stress levels, cholesterol, GFR, and more.
How do I calculate my BMI?
Use our BMI Calculator. Enter your height and weight, and the calculator will compute your BMI and categorize it according to WHO standards (underweight, normal, overweight, obese).
How do I calculate daily calorie needs?
Use our Calorie Calculator (BMR + TDEE). Enter your age, gender, height, weight, and activity level. The calculator will compute your BMR and total daily energy expenditure (TDEE).
How do I calculate my target heart rate zone?
Use our Target Heart Rate Zone Calculator. Enter your age and resting heart rate (optional). The calculator will compute your maximum heart rate and different training zones (fat burn, cardio, peak).
How do I calculate my due date?
Use our Due Date Calculator. Enter your last menstrual period (LMP) or conception date. The calculator will provide the estimated due date and current gestational age.
How do I calculate HbA1c from average blood sugar?
Use our HbA1c Average Blood Sugar calculator. Enter your average glucose in mg/dL or mmol/L, and the calculator will convert to estimated HbA1c percentage using the ADAG formula.
What is the difference between BMI and body fat percentage?
BMI is a simple height-to-weight ratio that doesn't distinguish between muscle and fat. Body fat percentage directly measures fat tissue. Our Body Fat Percentage Calculator provides a more accurate body composition assessment.
Are these calculators suitable for medical use?
Our calculators are based on clinically-validated formulas and guidelines. However, they are designed for educational and informational purposes only. Always consult a healthcare professional for medical decisions.
How often are new health calculators added?
We regularly add new calculators based on user requests and advances in health guidelines. If you have a suggestion, please contact us.
Can I use these calculators for fitness tracking?
Yes, our calculators are ideal for fitness tracking, weight management, and health monitoring. Use them alongside fitness apps and wearable devices for comprehensive health tracking.