Fitness Calculators
Science-backed fitness calculators for BMI, TDEE, BMR, body fat percentage, and more. All calculations use peer-reviewed formulas from WHO, NIH, and validated scientific literature.
BMI Calculator
Calculate your Body Mass Index from height and weight
TDEE Calculator
Find your Total Daily Energy Expenditure and maintenance calories
BMR Calculator
Calculate your Basal Metabolic Rate at complete rest
Body Fat Calculator
Estimate your body fat percentage using the Navy method
Ideal Weight Calculator
Find your ideal body weight using multiple scientific formulas
Age Calculator
Calculate your exact age in years, months, and days, or find the time between two dates
Sleep Calculator
Find the best bedtime or wake-up time based on 90-minute sleep cycles
Steps to Calories Calculator
Convert your daily step count to calories burned based on weight, height, and pace
One Rep Max Calculator
Estimate your one-rep max (1RM) using Epley, Brzycki, and other training formulas
Blood Pressure Checker
Check your systolic and diastolic blood pressure against standard AHA guidelines