Health Calculators
BMI, calorie, fitness, nutrition, and body health calculators.
Health and fitness calculations help you understand your body, set realistic goals, and track progress over time. From BMI and body fat percentage to calorie needs and training pace, our health calculators provide science-based estimates you can use at home or at the gym.
These tools are designed for personal wellness planning — not medical diagnosis. Use them to get a baseline, compare trends, and prepare informed questions for your doctor, nutritionist, or trainer.
All health calculators are free, private (nothing is sent to a server), and work on any device. Explore BMI, BMR, macro splits, pregnancy timelines, heart rate zones, sleep cycles, and more below.
Body composition
BMI, body fat percentage, ideal weight, lean body mass, waist-to-hip ratio, and body type assessments.
Nutrition & hydration
Daily calorie needs, macro breakdowns, protein targets, and recommended water intake based on weight and activity.
Fitness & training
One-rep max estimates, running pace, heart rate zones, and sleep cycle timing for recovery planning.
Life-stage tools
Pregnancy due date, ovulation windows, and BAC estimators for responsible decision-making.
All Health Tools
18 free calculators — click any tool to open it instantly.
BMI Calculator
Calculate BMI, healthy weight range, and estimated body fat in one place — with links to dedicated body composition tools for deeper analysis.
Calorie Calculator
Calculate TDEE, daily calories, BMR, and macro split (protein, carbs, fat) for weight loss, maintenance, or gain.
Ideal Weight
Find your ideal body weight range based on height, gender, and body frame size.
Body Fat Calculator
Estimate your body fat percentage using the US Navy method with neck, waist, and hip measurements.
Pregnancy Calculator
Calculate due date from LMP or gestational age, current pregnancy week, days until due, and conception estimate.
Macro Calculator
Calculate your optimal daily macronutrient split (protein, carbs, fat) based on your goals and activity level.
Water Intake Calculator
Calculate how much water you should drink daily based on weight, activity level, and climate.
Heart Rate Zone
Calculate your target heart rate training zones for fat burn, cardio, and peak performance.
BAC Calculator
Estimate your Blood Alcohol Content (BAC) based on drinks consumed, body weight, gender, and time elapsed.
Sleep Calculator
Find the best times to fall asleep or wake up based on 90-minute sleep cycles for optimal rest.
One Rep Max (1RM)
Estimate your one-rep maximum for any lift based on the weight and reps you can perform.
Running Pace Calculator
Calculate your running pace per mile or kilometer, finish time, or distance based on your running data.
Protein Intake Calculator
Calculate your recommended daily protein intake based on weight, activity level, and fitness goals.
Waist-to-Hip Ratio
Calculate your waist-to-hip ratio (WHR) to assess health risk related to body fat distribution.
BMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at rest to maintain basic life functions.
Body Type Calculator
Determine your body type (ectomorph, mesomorph, endomorph) based on measurements and characteristics.
Lean Body Mass
Calculate your lean body mass (total weight minus fat) using the Boer formula based on height and weight.
Ovulation Calculator
Estimate your most fertile days and ovulation date based on your menstrual cycle length and last period.