Health Calculators
BMI, calorie, heart rate, and fitness calculators for everyday health.
Browse all 20 health calculators below. Each tool is free, runs in your browser, and includes formulas, examples, and FAQs.
Age Grade Calculator
Compare your running performance adjusted for age and gender against world records
BMI Calculator
Calculate your Body Mass Index and check if you're in a healthy weight range
Calorie Calculator
Calculate calories burned during various physical activities based on MET values
ERG Calculator
Calculate rowing ergometer parameters including distance, time, split, and power output
Fat Intake Calculator
Calculate your daily fat intake needs based on total calories and dietary goals
Harris-Benedict Calculator
Calculate BMR and TDEE using the Harris-Benedict equation with age, gender, height, and weight
Heart Rate Calculator
Calculate maximum heart rate, target training zones, and assess cardiovascular fitness
Heart Rate Recovery Calculator
Measure cardiovascular fitness by tracking heart rate recovery after exercise
Katch-McArdle Calculator
Calculate BMR and TDEE based on lean body mass using the Katch-McArdle formula
Peptide Dosage Calculator
Calculate the correct peptide dosage and syringe measurements for reconstituted peptides
Pregnancy Countdown Calculator
Estimate your due date and track weeks, trimesters, and days remaining until baby arrives
Protein Calculator
Calculate your daily protein needs based on body weight, activity level, and fitness goals
Running Calorie Calculator
Calculate calories burned while running based on distance, pace, and terrain grade
Steps to Calories Calculator
Estimate calories burned while walking based on your steps and pace
Swimming Calories Calculator
Calculate calories burned while swimming based on stroke type and duration
Walking Calorie Calculator
Calculate calories burned while walking with distance, time, and incline options
Ideal Weight Calculator
Calculate your ideal body weight using multiple scientific formulas based on height and sex
Lean Body Mass Calculator
Calculate fat-free mass using Boer, James, and Hume formulas or body fat percentage
Weight Loss Calculator
Calculate how long it will take to reach your weight loss goal through exercise
Sleep Calculator
Calculate optimal sleep and wake times based on 90-minute sleep cycles