BMI is Body Mass Index which is calculated by dividing your weight twice by your height in Meters.
For example your height is 170cm then you divide it by 100 first , you get 1.70 ,now suppose your weight is 65k.g, now divide 65 by 1.70 , you get 38.235 and again divide 38.235 by 1.70 then you get 22.49.
That's it your BMI is 22.49, it is under normal BMI scale i.e 18.5 - 24.99, so you are eligible for all Study in terms of Body Mass Index.
If you have BMI above 30 , don't worry you can try Blank Study or you should loose some weight.