How to use BMI Plus Calculator ?

This online calculator free tool provides Body Mass Index BMI and similar BMI weight status category for adults 20 years of age or older.


What is the correct BMI for my age?

According to the National Institutes of Health (NIH): A BMI below 18.5 means a person is underweight. The BMI between 18.5 and 24.9 is ideal. BMI weighs between 25 and 29.9.

BMI Plus Formula and Categories

Below are the equations used for calculating BMI in the International System of Units (SI) and the US customary system (USC) using a 5'10", 160-pound individual as an example...

BMI Plus Formula:

USC Units: BMI = 703 × mass (lbs) height2 (in) = 703 × 160 702 = 22.96 kg m2

SI, Metric Units:

BMI Plus = mass (kg) height2 (m) = 72.57 1.782 = 22.90 kg m2

SI, Metric Units:

  • Underweight = 18.5
  • Normal weight = 18.5–24.9
  • Overweight = 25–29.9