Online Calculators
Explore our collection of 36 free and accurate calculators for health, nutrition, fitness, and more.
Body Composition
Calculators for weight analysis, body mass index, and body composition
BMI Calculator
Calculate your Body Mass Index
BMR Calculator (Basal Metabolic Rate)
Calculate your basal metabolic rate and daily calorie needs
Body Fat Calculator
Calculate your body fat percentage
Army Body Fat Calculator
Calculate your body fat percentage using the US Army formula
Body Frame Size Calculator
Determine your body frame size
Body Type Calculator
Determine your body type (Ectomorph/Mesomorph/Endomorph)
Body Surface Area Calculator
Calculate your Body Surface Area (BSA)
Healthy Weight Calculator
Calculate your ideal healthy weight range
Ideal Weight Calculator
Calculate your ideal weight using multiple scientific formulas
Lean Body Mass Calculator
Calculate your lean body mass using multiple formulas
Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio and assess your health risk
Nutrition
Tools to calculate calories, macronutrients, and nutritional needs
Calorie Calculator
Calculate your daily calorie needs
TDEE Calculator
Calculate your Total Daily Energy Expenditure
Macro Calculator
Calculate your daily macronutrients
Protein Calculator
Calculate your daily protein intake
Carbohydrate Calculator
Calculate your recommended daily carbohydrate intake
Fat Intake Calculator
Calculate your daily fat intake needs
Calories Burned Calculator
Calculate calories burned during different activities
Weight Watchers Points Calculator
Calculate SmartPoints for foods and your daily points budget
Pregnancy & Fertility
Calculators for pregnancy, due date, ovulation, and menstrual cycle
Pregnancy Calculator
Calculate your due date and pregnancy tracking
Due Date Calculator
Calculate your pregnancy due date
Ovulation Calculator
Calculate your ovulation date and fertile window
Period Calculator
Predict your next period and ovulation dates
Pregnancy Conception Calculator
Calculate your estimated conception date
Pregnancy Weight Gain Calculator
Calculate recommended weight gain during pregnancy
Health & Fitness
Calculators for heart rate, exercise, and general health
Heart Rate Calculator
Calculate your maximum heart rate and training zones
GFR Calculator
Calculate your estimated Glomerular Filtration Rate (eGFR) to assess kidney function. This calculator uses the CKD-EPI equation, the most accurate method for estimating kidney function.
One Rep Max Calculator
Calculate your one-repetition maximum (1RM) for weightlifting
Running Pace Calculator
Calculate your running pace, time, or distance
Sleep Calculator
Calculate your ideal sleep schedule based on sleep cycles
BAC Calculator
Calculate your Blood Alcohol Content (BAC) based on drinks consumed, weight, gender, and time
Blood Type Calculator
Predict your child's blood type based on parents' blood types
General
General-purpose calculators for everyday use
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes
Date Calculator
Calculate date differences and add or subtract days, months, and years
Percentage Calculator
Calculate percentages, percentage change, and percentage difference
Tip Calculator
Calculate tips and split the bill
Need a specific calculator?
We're constantly adding new calculators. If you can't find what you're looking for, let us know!