Free Online Health & Fitness Calculators
Track your health metrics and fitness goals with our comprehensive calculators. From BMI and body composition to calorie needs and workout planning - all free and easy to use.
★ Most Popular Health Calculators
BMI Calculator
Calculate your Body Mass Index to determine if you're underweight, normal, overweight, or obese.
Calorie Calculator
Calculate daily calorie needs for weight loss, maintenance, or muscle gain based on your activity level.
BMR Calculator
Calculate your Basal Metabolic Rate - the calories your body burns at rest using Mifflin-St Jeor formula.
Body Fat Calculator
Estimate body fat percentage using multiple methods including Navy, skinfold, and circumference measurements.
Ideal Weight Calculator
Find your ideal body weight range based on height, gender, and frame size using multiple formulas.
TDEE Calculator
Calculate Total Daily Energy Expenditure to know exactly how many calories you burn each day.
All Health & Fitness Calculators
Macro Calculator
Calculate optimal protein, carbohydrate, and fat intake based on your goals and activity level.
Pregnancy Calculator
Calculate pregnancy milestones, due date, and track fetal development week by week.
Pregnancy Weight Gain Calculator
Track healthy pregnancy weight gain based on pre-pregnancy BMI and trimester guidelines.
Conception Calculator
Estimate conception date from due date or last menstrual period for pregnancy planning.
Due Date Calculator
Calculate your baby's expected due date based on last menstrual period or conception date.
Pace Calculator
Calculate running or walking pace per mile or kilometer and predict race finish times.
Army Body Fat Calculator
Calculate body fat percentage using U.S. Army tape test standards for military fitness requirements.
Carbohydrate Calculator
Calculate daily carb needs for low-carb, keto, moderate, or high-carb diets based on your goals.
Lean Body Mass Calculator
Calculate lean body mass and fat-free mass to track muscle gains and body composition changes.
Healthy Weight Calculator
Find your healthy weight range based on BMI guidelines and get personalized recommendations.
Calories Burned Calculator
Calculate calories burned during exercise, sports, and daily activities based on duration and intensity.
One Rep Max Calculator
Calculate your one-rep max for any lift based on weight and reps to plan strength training.
Target Heart Rate Calculator
Find your target heart rate zones for fat burning, cardio, and peak performance training.
Protein Calculator
Calculate daily protein requirements for muscle building, weight loss, or athletic performance.
Fat Intake Calculator
Calculate optimal daily fat intake including saturated, unsaturated, and omega fatty acids.
Ovulation Calculator
Predict ovulation dates and fertile window to maximize chances of conception or avoid pregnancy.
Period Calculator
Track menstrual cycles and predict next period dates based on your average cycle length.
GFR Calculator
Calculate Glomerular Filtration Rate to assess kidney function and chronic kidney disease stage.
Body Type Calculator
Determine your body type - ectomorph, mesomorph, or endomorph - for personalized diet and training.
Body Surface Area Calculator
Calculate body surface area (BSA) for medical dosing, burn assessment, and metabolic calculations.
BAC Calculator
Estimate blood alcohol content based on drinks consumed, weight, gender, and time elapsed.
Water Intake Calculator
Calculate how much water you should drink daily based on weight, activity level, and climate.
Sleep Calculator
Calculate optimal bedtime and wake times based on sleep cycles to wake up refreshed.
Height Calculator
Predict a child's adult height based on parents' heights and current age using growth charts.
VO2 Max Calculator
Estimate your VO2 max and cardiovascular fitness level using various test protocols.
Heart Rate Zone Calculator
Calculate five heart rate training zones from recovery to maximum effort for optimal workouts.
Steps to Calories Calculator
Convert daily step count to calories burned based on your weight, pace, and stride length.
Marathon Pace Calculator
Calculate marathon, half marathon, 10K, and 5K pace and finish time predictions for race planning.
Cycling Calorie Calculator
Calculate calories burned cycling based on speed, duration, weight, and terrain type.
Running Calorie Calculator
Calculate calories burned running or jogging based on distance, pace, weight, and incline.
About Our Health Calculators
Body Composition Tools
Start with our BMI calculator to understand your body mass index. For a more complete picture, use the body fat calculator and ideal weight calculator.
Nutrition & Calories
Calculate your daily energy needs with our TDEE calculator, or use the calorie calculator to plan your diet for weight loss, maintenance, or muscle gain.
Calculator Categories
- • Body Metrics: BMI, body fat, lean mass, ideal weight
- • Calories: TDEE, BMR, calorie needs, deficit/surplus
- • Nutrition: Macros, protein, carbs, fat requirements
- • Fitness: Heart rate zones, VO2 max, pace calculator
- • Pregnancy: Due date, ovulation, conception date
- • Hydration: Daily water intake recommendations
Frequently Asked Questions
What is BMI and how is it calculated?▼
BMI (Body Mass Index) is a measure of body fat based on height and weight. It's calculated as weight (kg) divided by height (m) squared. Use our BMI calculator to find your BMI and see which category you fall into (underweight, normal, overweight, or obese).
What's the difference between BMR and TDEE?▼
BMR (Basal Metabolic Rate) is the calories your body burns at rest. TDEE (Total Daily Energy Expenditure) includes BMR plus calories burned through daily activities and exercise. Use our TDEE calculator for accurate daily calorie needs.
How many calories should I eat to lose weight?▼
To lose weight, create a calorie deficit by eating less than your TDEE. A safe deficit is 500-750 calories per day for 1-1.5 lbs of weight loss per week. Our calorie calculator can help you determine your specific needs based on your goals.
How accurate are these health calculators?▼
Our calculators use scientifically validated formulas like Mifflin-St Jeor for BMR and standard BMI formulas. Results are estimates based on population averages. For personalized health advice, consult a healthcare professional.