Weight & Body Composition15
BMI Calculator
Units, Your Weight → Your BMI, Category, Healthy Weight for Your Height
BMR Calculator
Your Weight, Your Height → BMR (kcal / day), What this means
Body Fat Calculator
Sex, Height → Body Fat %, Category, What this means
Ideal Weight Calculator
Units, Height → Ideal Weight (average of 4 formulas), Healthy Range Low, Healthy Range High
Lean Body Mass Calculator
Weight, Body Fat % → Lean Body Mass, Fat Mass, What this means
TDEE Calculator
Your Weight, Your Height → TDEE (kcal / day), BMR (kcal / day), What this means
Waist-to-Hip Ratio Calculator
Waist Circumference, Hip Circumference → Waist / Hip Ratio, Risk Band, What this means
Body Surface Area Calculator
Weight, Height → Body Surface Area (m²), What this means
Metabolic Age Calculator
Your BMR, Chronological Age → Metabolic Age, Vs Calendar Age, What this means
Weight Loss Calculator
Current Weight, Goal Weight → Weeks to Goal, Suggested Daily Calories, Daily Deficit
Weight Gain Calculator
Current Weight, Goal Weight → Weeks to Goal, Suggested Daily Calories, Daily Surplus
Pregnancy Weight Gain Calculator
Pre-pregnancy BMI Category → Suggested Gain Low (kg), Suggested Gain High (kg), What this means
Child BMI Calculator
Age (years), Plus months → BMI, BMI-for-age percentile, CDC category
Teen BMI Calculator
Age (years), Plus months → BMI, BMI-for-age percentile, CDC category
Senior BMI Calculator
Age, Sex → BMI, Standard adult category, Older-adult reading
Calories, Macros & Nutrition44
Calorie Calculator
Your Weight, Your Height → BMR (at rest), Maintain Weight, Lose Weight Target
Water Intake Calculator
Your Weight, Activity Level → Daily Water (liters), Daily Water (ml), Approx. Glasses (250 ml)
Protein Calculator
Body Weight, Goal → Daily Protein (g), Per Meal (3 meals), What this means
Macro Calculator
Daily Calories, Protein % → Protein (g), Carbs (g), Fat (g)
Walking Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Cycling Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Swimming Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Calorie Deficit Calculator
Your Weight, Your Height → Maintenance Calories (TDEE), Daily Deficit Needed, Target Daily Calories
Calorie Surplus Calculator
Your Weight, Your Height → Maintenance Calories (TDEE), Daily Surplus Needed, Target Daily Calories
Keto Macro Calculator
Daily Calories, Weight → Fat (g), Protein (g), Net Carbs (g)
Intermittent Fasting Calculator
Fasting Pattern, Start Eating At (24h) → Eating Window, Fasting Hours, Eating Hours
Carb Calculator
Carbohydrates Intake, Daily Target → Status, % of Daily Target, Your Intake
Fat Intake Calculator
Fat Intake, Daily Target → Status, % of Daily Target, Your Intake
Fiber Intake Calculator
Fiber Intake, Daily Target → Status, % of Daily Target, Your Intake
Sugar Intake Calculator
Added Sugar Intake, Daily Target → Status, % of Daily Target, Your Intake
Sodium Intake Calculator
Sodium Intake, Daily Target → Status, % of Daily Target, Your Intake
Vitamin D Calculator
Vitamin D Intake, Daily Target → Status, % of Daily Target, Your Intake
Iron Intake Calculator
Iron Intake, Daily Target → Status, % of Daily Target, Your Intake
Blood Sugar Converter
Blood Sugar Value, From Unit → Converted Value, Unit, Summary
Steps to Calories Calculator
Steps Today, Stride Length → Distance (km), Est. Calories, Summary
Stairs Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Hiking Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Yoga Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Pilates Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
HIIT Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
CrossFit Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Boxing Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Tennis Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Golf Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Basketball Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Soccer Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Volleyball Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Badminton Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Cricket Calorie Calculator
Your Weight, Duration → Calories Burned, Burn Rate (kcal/hour), MET Used
Fluid Requirement Calculator
Your Weight, Activity Level → Daily Water (liters), Daily Water (ml), Approx. Glasses (250 ml)
Alcohol Unit Calculator
Drink Volume, Alcohol % (ABV) → UK Alcohol Units, Alcohol (grams), What this means
Caffeine Intake Calculator
Caffeine Intake, Daily Target → Status, % of Daily Target, Your Intake
Hydration Calculator
Your Weight, Activity Level → Daily Water (liters), Daily Water (ml), Approx. Glasses (250 ml)
Meal Prep Calculator
Servings in Recipe, Servings You Want → Scaled Amount, Scale Factor, Summary
Portion Size Calculator
Servings in Recipe, Servings You Want → Scaled Amount, Scale Factor, Summary
Recipe Calorie Calculator
Total Recipe Calories, Number of Servings → Calories per Serving, Summary
Nutrition Label Calculator
Calories per Serving, Servings You Ate → Total Calories, Protein (g), Carbs (g)
Food Calorie Calculator
Total Recipe Calories, Number of Servings → Calories per Serving, Summary
Restaurant Calorie Calculator
Total Recipe Calories, Number of Servings → Calories per Serving, Summary
Activity & Exercise9
Heart Rate Calculator
Your Age, Resting Heart Rate → Est. Max HR, Fat Burn Low, Fat Burn High
VO2 Max Calculator
Age, Resting Heart Rate → Est. VO₂ Max, Fitness Band, What this means
One Rep Max Calculator
Weight Lifted, Reps Completed → Estimated 1RM, Epley Estimate, What this means
Running Pace Calculator
Distance, Hours → Pace (min/km), Speed (km/h), Summary
Resting Heart Rate Calculator
Measured Resting HR, Age → Resting HR Band, Your RHR, What this means
Target Heart Rate Calculator
Age, Resting Heart Rate → Max HR, Fat-burn / easy low, Fat-burn / easy high
Maximum Heart Rate Calculator
Age → 220 − Age, Tanaka Estimate, What this means
Exercise Heart Rate Calculator
Age, Resting Heart Rate → Max HR, Fat-burn / easy low, Fat-burn / easy high
Cardio Zone Calculator
Age, Resting Heart Rate → Max HR, Fat-burn / easy low, Fat-burn / easy high
Pregnancy & Fertility8
Pregnancy Calculator
First Day of Last Period (LMP) → Estimated Due Date, Gestational Weeks (today), What this means
Ovulation Calculator
First Day of Last Period, Average Cycle Length → Estimated Ovulation, Fertile Window, What this means
Due Date Calculator
First Day of Last Period (LMP) → Estimated Due Date, Gestational Weeks (today), What this means
Fertility Calculator
First Day of Last Period, Average Cycle Length → Est. Ovulation Day, Fertile Window, Est. Next Period
Conception Calculator
First Day of Last Period, Average Cycle Length → Est. Ovulation Day, Fertile Window, Est. Next Period
Gestational Age Calculator
First Day of Last Period → Trimester, Gestational Weeks, Est. Due Date
Trimester Calculator
First Day of Last Period → Trimester, Gestational Weeks, Est. Due Date
Baby Growth Calculator
Age (months), Weight → Weight vs Simple Avg %, Length vs Simple Avg %, Important
Vitals, Labs & Clinical12
Blood Pressure Tracker
Systolic (upper number), Diastolic (lower number) → Category, Your Reading, What this means
Smoking Cost Calculator
Cigarettes / Day, Price per Pack → Cost / Day, Cost / Year, Spent Over Years Entered
Sleep Calculator
Wake-up Time (HH:MM) → Bedtime (6 cycles ≈ 9 h), Bedtime (5 cycles ≈ 7.5 h), Bedtime (4 cycles ≈ 6 h)
A1C Calculator
HbA1c (%) → Typical Category, Est. Avg Glucose (mg/dL), Est. Avg Glucose (mmol/L)
Cholesterol Ratio Calculator
Total Cholesterol, HDL (good) → Total / HDL Ratio, Ratio Status, What this means
Blood Pressure Category Calculator
Systolic (upper number), Diastolic (lower number) → Category, Your Reading, What this means
Blood Volume Calculator
Weight, Sex → Blood Volume (L), Blood Volume (ml), Summary
Urine Output Calculator
Urine Volume, Collection Hours → ml/kg/hour, Status, What this means
Creatinine Clearance Calculator
Age, Weight → Creatinine Clearance, What this means
GFR Calculator
Serum Creatinine, Age → eGFR, CKD Stage (approx), What this means
BSA Dosage Calculator
BSA, Dose per m² → Total Dose (mg), Important
Pediatric Dosage Calculator
Child Weight, Dose (mg per kg) → Suggested Dose (mg), Max Cap Applied?, Important
More health tools11
Diabetes Risk Calculator
Your Age, Sex → Risk Level, Risk Score, Score Scale
BAC Calculator
Body Weight, Sex → Estimated BAC %, Impairment Level, Safety note
Calcium Intake Calculator
Calcium Intake, Daily Target → Status, % of Daily Target, Your Intake
Fat Burning Zone Calculator
Age, Resting Heart Rate → Max HR, Fat-burn / easy low, Fat-burn / easy high
Step Counter Calculator
Steps Today, Stride Length → Distance (km), Est. Calories, Summary
Body Measurement Calculator
Chest, Waist → Waist / Hip Ratio, Chest − Waist (cm), Waist Risk Band
Dress Size Calculator
Bust, Waist → Approx. US Size, Note
Shoe Size Converter
Shoe Size, From System → EU, UK, US Men (approx)
Ring Size Calculator
Finger Circumference → Inner Diameter (mm), Approx. US Ring Size, Summary
Drug Half Life Calculator
Half-life, Starting Amount → ≈ Time to Clear (5× half-life), Approx. Left After 5×, What this means
Electrolyte Calculator
Electrolyte Drink Sodium Intake, Daily Target → Status, % of Daily Target, Your Intake
What the health tools cover
These calculators put numbers on the measurements people most often want to interpret: weight and body composition (BMI, body fat, ideal weight), energy needs (BMR, TDEE, calories, macros), exercise (heart-rate zones, running pace, activity calorie burn from published MET values) and pregnancy dates (due date, ovulation).
Where more than one accepted method exists, each page names the one it uses. Energy calculators use Mifflin-St Jeor rather than the older Harris-Benedict equation. Body fat uses the US Navy circumference method. Heart-rate zones show both the plain percentage-of-maximum method and the Karvonen method, because the two disagree by a wide margin for anyone with a low resting pulse.
How to read the results
- All of these are population formulas. They describe an average person of your height, weight, age and sex, and you are not that person.
- A single reading is less useful than the trend. Record the number and repeat the measurement the same way next month.
- Calorie targets carry an error of roughly 10 to 15 percent before you account for how honestly the activity level was chosen. Adjust from what the scale actually does over a few weeks.
- None of this is a diagnosis. A clinician with your history will read the same number differently.
Health numbers are nobody else's business, so the calculations run in your browser and nothing you type is stored.