Health

Health Calculators

12 interactive tools with transparent guidance and tested shared calculation logic.

Estimate body mass index from weight and height.

Estimate basal metabolic rate using the Mifflin-St Jeor equation.

Estimate total daily energy expenditure from BMR and activity level.

Estimate ideal body weight using the Devine formula.

Compare waist circumference with height.

Estimate a simple daily water target from body weight.

Estimate a daily protein range using body weight and selected target.

Estimate daily calorie target from maintenance calories and desired deficit.

Estimate a target heart-rate zone using percentage of age-predicted maximum.

Count backwards in 90-minute sleep cycles from a wake time.

Estimate a due date as 280 days after the first day of the last menstrual period.

Estimate ovulation date from cycle start and average cycle length.