Hrt and Body - BMI-WHR-THR

Hrt and Body is a 3in1 Hlth Calculator.
1. Calculate BMI (Body Mass Index)
2. Calculate WHR (Waist to Height Ratio)
3. Calculate THR (Target Hrt Rate)
Is It Important to Know What Your Body Mass Index Formula is?
It's good to understand that BMI is calculated using your weight and height.