Health Rechners
12 interactive tools with transparent guidance and tested shared calculation logic.
BMI Rechner
Estimate body mass index from weight and height.
HealthBMR Rechner
Estimate basal metabolic rate using the Mifflin-St Jeor equation.
HealthTDEE Rechner
Estimate total daily energy expenditure from BMR and activity level.
HealthIdeal Weight Rechner
Estimate ideal body weight using the Devine formula.
HealthWaist to Height Ratio Rechner
Compare waist circumference with height.
HealthWater Intake Rechner
Estimate a simple daily water target from body weight.
HealthProtein Intake Rechner
Estimate a daily protein range using body weight and selected target.
HealthCalorie Deficit Rechner
Estimate daily calorie target from maintenance calories and desired deficit.
HealthHeart Rate Zone Rechner
Estimate a target heart-rate zone using percentage of age-predicted maximum.
HealthSleep Time Rechner
Count backwards in 90-minute sleep cycles from a wake time.
HealthPregnancy Due Date Rechner
Estimate a due date as 280 days after the first day of the last menstrual period.
HealthOvulation Rechner
Estimate ovulation date from cycle start and average cycle length.