Free Health & Fitness Online
22 free tools — no signup required
Health and fitness calculators for body metrics, nutrition, and exercise planning. Calculate BMI, body fat percentage, daily calorie needs, macronutrient ratios, heart rate zones, and pace conversions. Track your fitness goals with accurate, science-based calculations.
Pregnancy Due Date Calculator
Estimate your due date based on your last menstrual period.
BAC Calculator
Estimate blood alcohol content based on drinks, weight, and time.
Sleep Cycle Calculator
Calculate optimal bedtime and wake-up times based on sleep cycles.
Ovulation Calculator
Estimate ovulation dates and fertile window from cycle data.
Blood Type Calculator
Determine possible child blood types based on parents' blood types.
Dog Age Calculator
Convert dog years to human years using breed-size-adjusted formulas.
Pregnancy Weight Tracker
Track healthy pregnancy weight gain based on BMI and guidelines.