🏥 Health

Health Calculators

Free tools for body composition, fitness, nutrition and reproductive health. Formulas from WHO, CDC and NIH.

Body Composition
Body
BMI Calculator
Body mass index with WHO category chart, healthy weight range and visual gauge.
Visual gauge · Metric + Imperial
 Body
Body Fat Calculator
Body fat % using US Navy method and BMI method with ACE fitness categories.
Navy + BMI methods
 Body
Waist-Hip Ratio
WHR cardiovascular risk assessment per WHO guidelines. Metric and imperial.
WHO guidelines
Nutrition
Nutrition
Calorie Calculator
Daily calorie target (TDEE) at 5 activity levels with macro split.
TDEE · Macros
 Nutrition
BMR Calculator
Basal metabolic rate with Mifflin-St Jeor and Harris-Benedict formulas.
Two formulas
Fitness
Fitness
Heart Rate Zones
Max heart rate and 5 training zones using Karvonen, Fox and Tanaka formulas.
5 zones · 3 formulas
 Fitness
One Rep Max (1RM)
1RM estimate with 5 formulas and training percentage table.
5 formulas
 Fitness
VO2 Max Calculator
Aerobic fitness estimate with fitness age comparison.
Fitness age
 Safety
Blood Alcohol (BAC)
BAC via Widmark formula with 40+ country legal driving limits.
40+ country limits
Reproductive Health
Fertility
Ovulation Calculator
Fertile window and ovulation date with 3-cycle calendar view.
Fertile window
 Pregnancy
Due Date Calculator
Pregnancy due date with trimester milestones and development stages.
Milestones · Trimesters
 Fertility
Period Calculator
Next period prediction with 6-month cycle calendar.
6-month calendar
 Pregnancy
Pregnancy Weight
Recommended weight gain by trimester using IOM guidelines.
IOM guidelines
Other Health
Environment
Carbon Footprint
CO2 emissions from travel, home energy and diet.
Travel · Home · Diet
 Medical
Hirsutism Score
Ferriman-Gallwey hirsutism score with clinical interpretation.
Clinical scale