Free tools for health calculations and conversions. All tools run in your browser with no data sent to any server.
All Health Tools
BMI Calculator
Calculate Body Mass Index from height and weight
BMR Calculator
Estimate basal metabolic rate (BMR)
Body Fat Calculator
Estimate body fat percentage from BMI
Calorie Needs Calculator
Estimate daily calories by activity level
Ideal Weight Calculator
Estimate ideal weight from height
Pace Calculator
Calculate running pace and race finish times
Calories Burned Calculator
Estimate calories burned from any activity
Macro Calculator
Calculate protein, carbs, and fat targets
Sleep Cycle Calculator
Find optimal wake times based on 90-min cycles
One Rep Max Calculator
Estimate 1RM from weight and reps
Heart Rate Zone Calculator
Calculate training zones based on max HR
Hydration Calculator
Calculate daily water intake needs
Protein Calculator
Calculate daily protein requirements
Due Date Calculator
Calculate pregnancy due date from LMP or conception
Conception Date Calculator
Estimate when you conceived from due date or birth date
Ovulation Calculator
Predict ovulation date and fertile window
Pregnancy Weight Gain Calculator
Track recommended weight gain during pregnancy based on pre-pregnancy BMI and week
Fasting Calculator
Track intermittent fasting windows (16:8, 20:4, etc.)
Steps to Miles Converter
Convert steps walked to miles or kilometers
Water Intake Calculator
Calculate personalized daily water needs
Blood Type Calculator
Predict possible child blood types from parent blood types
Waist-to-Hip Ratio Calculator
Calculate WHR and assess health risk by body shape
TDEE Calculator
Calculate Total Daily Energy Expenditure and personalized calorie targets
Body Surface Area Calculator
Calculate BSA using Du Bois, Mosteller, and other medical formulas
Lean Body Mass Calculator
Calculate lean body mass and fat-free mass index (FFMI)
VO2 Max Calculator
Estimate VO2 max using multiple test methods with fitness classification
Blood Alcohol Calculator
Estimate blood alcohol content (BAC) based on drinks, weight, gender, and time
Alcohol Calorie Calculator
Calculate calories in alcoholic drinks by type, size, and ABV percentage
Screen Time Calculator
Calculate and visualize your daily screen time across devices and activities
Air Quality Index Calculator
Calculate AQI from pollutant concentrations with health guidance and breakpoint tables
Blood Pressure Calculator
Check your blood pressure category and get health insights based on AHA guidelines
Sleep Calculator
Calculate optimal bedtime or wake-up time based on 90-minute sleep cycles
Heart Rate Zone Calculator
Calculate your target heart rate training zones for optimal exercise intensity
Food Calorie Calculator
Look up calories and macros for common foods and track your daily meal intake
Pregnancy Due Date Calculator
Estimate your due date and track pregnancy milestones from LMP, conception, or IVF transfer date
Macronutrient Calculator
Calculate daily protein, carbs, and fat targets based on calories, goals, and activity level
Protein Intake Calculator
Calculate recommended daily protein intake based on body weight, activity level, and fitness goals