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.
Calorie Calculator
Calculate daily calorie needs based on age, weight, height, and activity level.
BMR Calculator
Calculate your Basal Metabolic Rate — calories burned at rest.
TDEE Calculator
Calculate Total Daily Energy Expenditure based on activity level.
Body Fat Calculator
Estimate body fat percentage using the US Navy method.
Ideal Weight Calculator
Calculate your ideal weight range based on height and frame size.
Pregnancy Due Date Calculator
Estimate your due date based on your last menstrual period.
Water Intake Calculator
Calculate how much water you should drink daily based on weight and activity.
Macro Calculator
Calculate optimal macronutrient ratios (protein, carbs, fat) for your goals.
Heart Rate Zone Calculator
Calculate target heart rate zones for cardio training.
Running Pace Calculator
Calculate running pace, speed, and finish time for any distance.
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.
Protein Intake Calculator
Calculate daily protein needs based on weight and fitness goals.
One Rep Max Calculator
Estimate your one-rep max from the weight and reps of a set.
Blood Type Calculator
Determine possible child blood types based on parents' blood types.
Shoe Size Converter
Convert shoe sizes between US, UK, EU, and international standards.
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.
VO2 Max Calculator
Estimate your VO2 max from running performance data.
Lean Body Mass Calculator
Calculate lean body mass from weight and body fat percentage.
Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio to assess health risk.