Health Calculators
BMI, calorie needs, body fat and other fitness tools. Browse our collection of 18 free online calculators — fast, accurate, and ready to use.
BMI Calculator
Calculate your Body Mass Index to determine if you are in a healthy weight range for your height.
CalculateCalorie Calculator
Estimate your daily calorie needs for maintaining, gaining, or losing weight based on activity level.
CalculateBody Fat Calculator
Estimate body fat percentage using the Navy method with simple circumference measurements.
CalculateBMR Calculator
Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation to find calories burned at rest.
CalculateCalories Burned Calculator
Estimate calories burned during exercise based on activity type, duration, body weight, and intensity (MET values).
CalculateIdeal Weight Calculator
Estimate ideal body weight using multiple formulas: Devine, Robinson, Miller, and Hamwi for comparison.
CalculatePregnancy Due Date Calculator
Calculate your estimated due date based on last menstrual period (LMP) using Naegele's rule, plus pregnancy week timeline.
CalculatePace Calculator
Calculate running pace, speed, and finish time for any distance including marathon, half marathon, 5K, and 10K.
CalculateProtein Calculator
Calculate daily protein needs based on body weight, activity level, and fitness goal (muscle gain, maintenance, weight loss).
CalculateWater Intake Calculator
Calculate how much water you should drink daily based on body weight, age, activity level, and climate.
CalculateSleep Calculator
Calculate ideal bedtime or wake-up time based on 90-minute sleep cycles to wake up feeling refreshed.
CalculateHeart Rate Zone Calculator
Calculate your maximum heart rate and 5 training zones (zones 1-5) based on age for effective cardio workouts.
CalculateMacro Calculator
Calculate daily macronutrient targets (protein, carbs, fat) for weight loss, maintenance, or muscle gain with flexible diet plans.
CalculateLean Body Mass Calculator
Estimate your lean body mass (LBM) using the Boer formula based on weight, height, age, and gender.
CalculateWaist to Hip Ratio Calculator
Calculate waist-to-hip ratio (WHR) and assess health risk levels based on WHO classification standards.
CalculateTDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) and BMR with personalized calorie and macronutrient targets.
CalculatePeriod Calculator
Predict your next period, ovulation day, and fertile window with a 6-month cycle calendar.
CalculatePregnancy Calculator
Calculate your due date, current pregnancy week, and trimester from your last period.
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Finance Calculators
Mortgage, loans, interest, savings, and retirement planning tools
General Calculators
Percentages, discounts, dates, age and everyday math tools
Math Calculators
GPA, fractions, statistics, geometry and more math tools
Niche Calculators
Specialized calculators for roofing, ecommerce sellers and more
Construction Calculators
Concrete, lumber, roofing, flooring and other building material tools