Home and health
Health & Wellness
25 free tools for health and wellbeing: BMI, ideal weight and body fat, calories, metabolism and macros, how much water to drink, pregnancy weeks, ovulation and children's growth, sleep cycles, blood pressure values and guided breathing. They are estimates and do not replace a doctor's advice.
Most popular
Sleep cycle calculator
Find the best time to go to bed or wake up at the end of a sleep cycle.
Pregnancy week calculator
Current week, trimester and estimated due date from your last period.
Heart rate zones
Your 5 training zones in bpm from your age, with the optional Karvonen method.
HbA1c converter
Convert HbA1c between mmol/mol and percent and get the estimated average glucose.
Baby age
Weeks, months and corrected age for preemies
Guided breathing
Box breathing and 4-7-8 with a visual guide
All tools, A to Z 25
Baby age
Weeks, months and corrected age for preemies
Basal metabolic rate
Resting (BMR) and maintenance calories from weight, height, age and activity.
Blood alcohol
Estimate blood alcohol (Widmark formula).
Blood pressure values
Is your blood pressure normal or high?
BMI Calculator
Body mass index from weight and height, with WHO category and healthy range.
Body fat %
Estimate your body fat percentage with the U.S. Navy method, using just a tape.
Calorie deficit
Calories to lose weight and time to goal.
Child's future height
Estimate adult height from the parents.
Children's blood type
Which blood type a child can inherit
Conception date
Estimate conception from the due date.
Daily calorie needs
BMR and daily calorie needs (TDEE) with the Mifflin-St Jeor equation.
Daily water intake
Estimate from weight and activity: liters, 8-oz glasses, and water bottles per day.
Feels-like temperature
How hot or cold it really feels
Growth percentiles
Baby's weight and height: which percentile?
Guided breathing
Box breathing and 4-7-8 with a visual guide
HbA1c converter
Convert HbA1c between mmol/mol and percent and get the estimated average glucose.
Heart rate zones
Your 5 training zones in bpm from your age, with the optional Karvonen method.
Ideal weight
Healthy weight range from height and sex, with BMI range and the Lorenz formula.
Macronutrients
Protein, carbs and fat in grams by goal.
Medical unit converter
Glucose, cholesterol and more: mg/dL ⇄ mmol/L.
Ovulation calculator
Fertile days, ovulation and next period from your last period date.
Pregnancy week calculator
Current week, trimester and estimated due date from your last period.
Sleep cycle calculator
Find the best time to go to bed or wake up at the end of a sleep cycle.
Steps to miles & km
Convert steps to miles and km from your stride length, with approximate calories.
Waist-to-height ratio
Belly fat indicator (target <0.5).