Here is BMI formula if you don’t want to use our BMI Calculator and calculate body mass index manually.

It is very simple:

**Imperial or English BMI formula**:

BMI = [weight_in_pounds / (height_in_inches * height_in_inches)] *703

*Example*: weight = 145lbs, height = 6 ft 1 in (ie 73 inches) and BMI = [ 145 / (73 * 73) ] * 703 = 19.13**Metric BMI formula**:

BMI = weight_in_kilograms / (height_in_meters * height_in_meters)

*Example*: weight = 70kg, height = 1.80m and BMI = 70 / (1.8 * 1.8) = 21.6

Check BMI charts into which category your BMI falls.