Health Calculators
Track BMI, calories, body fat, and hydration with reliable health tools. 34 free tools, fast and accurate.
💡 Understand your body better with these evidence-based health calculators. BMI, calorie needs, body fat, and more — all computed privately in your browser.
Health Calculators
BAC Calculator
Estimate blood alcohol content and impairment
BMI Calculator
Body Mass Index and category
BMR Calculator
Basal metabolic rate
Blood Pressure Calculator
Classify your reading using AHA guidelines
Blood Volume Calculator
Estimate total blood volume (Nadler formula)
Body Fat Calculator
Body fat percentage
Body Type Calculator
Ectomorph / mesomorph / endomorph from your frame
Caffeine Calculator
Track daily caffeine against the 400 mg limit
Calorie Calculator
Daily calorie needs
Calories Burned Calculator
Estimate calories burned for any activity
Child Height Predictor
Predict adult height from parents' heights
Conception Date Calculator
Estimate conception date and last menstrual period
Due Date Calculator
Estimated due date and trimester milestones
Heart Rate Zone Calculator
Target heart rate zones (Karvonen) for training
Ideal Weight Calculator
Healthy weight range
Intermittent Fasting Calculator
Plan your eating and fasting windows
Lean Body Mass Calculator
Boer formula for lean body mass and body fat
Macro Calculator
Split your calories into carbs, protein, and fat
One Rep Max Calculator
Estimate your 1-rep max from any rep count (Epley formula)
Ovulation Calculator
Estimate ovulation and fertile window from your cycle
Pace Calculator
Running pace and speed
Pregnancy Calculator
Due date and weeks pregnant
Protein Intake Calculator
Recommended daily protein for your body weight and activity
Running Pace Calculator
Convert finish time and distance to pace and speed
Sleep Calculator
Best bedtime or wake-up time based on 90-min sleep cycles
Step to Calorie Calculator
Estimate calories burned from your daily step count
Steps to Miles Calculator
Convert step count to distance and calories
Stress Test Calculator
Heart rate zones based on age and resting pulse
TDEE Calculator
Total daily energy expenditure
Target Heart Rate (Weight Loss) Calculator
Fat-burn, cardio, and peak zones for weight loss
VO2 Max Calculator
Estimate cardiovascular fitness from resting heart rate
Waist-to-Height Ratio Calculator
A healthier alternative to BMI
Waist-to-Hip Ratio
WHR health indicator
Water Intake Calculator
Daily hydration needs