Health & Fitness Calculators
Track your health and fitness goals with our easy-to-use calculators. Monitor BMI, calories, body fat, and more.
Weight & Body Composition
BMI Calculator
Calculate your Body Mass Index.
Body Fat Calculator
Estimate your body fat percentage.
Ideal Weight Calculator
Find your healthy weight range.
Healthy Weight Calculator
Determine your healthy weight range.
Lean Body Mass Calculator
Calculate your lean body mass.
Body Type Calculator
Determine your body type classification.
Body Surface Area Calculator
Calculate body surface area using medical formulas.
Army Body Fat Calculator
Calculate body fat using Army tape test.
Anorexic BMI Calculator
Assess underweight BMI ranges and health risks.
Overweight Calculator
Assess overweight status and health risks.
Nutrition & Calories
Calorie Calculator
Estimate daily calorie needs for weight loss or maintenance.
BMR Calculator
Calculate Basal Metabolic Rate.
TDEE Calculator
Calculate your Total Daily Energy Expenditure.
Macro Calculator
Calculate your optimal macronutrient split.
Calories Burned Calculator
Estimate calories burned during exercise and activities.
Protein Calculator
Calculate your daily protein requirements.
Carbohydrate Calculator
Calculate your daily carbohydrate needs.
Fat Intake Calculator
Calculate your daily fat intake needs.
Pregnancy & Fertility
Pregnancy Calculator
Estimate due date and pregnancy milestones.
Ovulation Calculator
Track your most fertile days.
Due Date Calculator
Estimate your pregnancy due date.
Pregnancy Weight Gain Calculator
Track recommended pregnancy weight gain.
Pregnancy Conception Calculator
Estimate your conception date.
Period Calculator
Predict your next period and fertile window.
Conception Calculator
Estimate conception date and fertile window.
Fitness & Exercise
Which Calculator Should I Use?
About Health & Fitness Calculators
Health and fitness calculators help you understand your body, set evidence-based goals, and track progress. From basic metrics like BMI and body fat percentage to specialized tools for pregnancy tracking, calorie planning, and exercise optimization, these calculators translate complex medical and nutritional formulas into actionable numbers. While no calculator replaces professional medical advice, having accurate data about your body composition, metabolic rate, and nutritional needs empowers you to make informed decisions about diet, exercise, and overall wellness.
Why use these calculators?
- Accurate results based on standard formulas
- Fast and mobile-friendly interface
- Completely free to use with no registration
Best Practices
Always double-check your inputs for accuracy. While our tools are rigorous, for critical financial or health decisions, we recommend consulting with a professional explanation.
Frequently Asked Questions
How is BMI calculated?
BMI is calculated based on your weight and height. It is a general indicator of body fatness but does not diagnose health.
What formula is used for BMR?
We use the Mifflin-St Jeor equation, which is considered one of the most accurate for estimating BMR.
How accurate are body fat calculators?
Online calculators using circumference measurements (Navy method) have a margin of error of about 3-5%. DEXA scans and hydrostatic weighing are more accurate but require specialized equipment.
How many calories should I eat to lose weight?
A deficit of 500 calories per day below your TDEE typically results in about 1 pound of weight loss per week. Use our Calorie Calculator to find your TDEE, then subtract 500.
Are pregnancy due date calculators accurate?
Due date calculators provide an estimate based on your last menstrual period or conception date. Only about 5% of babies arrive on their exact due date — most are born within two weeks of it.
What is the difference between BMI and body fat percentage?
BMI is a simple height-to-weight ratio. Body fat percentage measures actual fat tissue. BMI can misclassify muscular people as overweight, so body fat percentage gives a more complete picture.
How do I know my target heart rate for exercise?
Your target heart rate depends on your age and fitness goals. For moderate exercise, aim for 50-70% of your max heart rate (220 minus your age). For vigorous exercise, aim for 70-85%. Use our Target Heart Rate Calculator.