Just BMI is an ad free and open source application.
As the name says it is calculates only BMI nothing fancy .
It takes in :
#Weight in kilograms and pounds
#Height in centimeters , ft and inches
Based on BMI calculation formula present on Wikipedia and all the textual remarks are also from Wikipedia except one.
The source code can be downloaded from our website.
BMI is not a measure of how healthy a person is , its just a a parameter which indicates/suggests that a person falling under this range may be classified as this.