Lifestyle Optimizer Free BMI & Healthy Lifestyle Calculator

Calculate your BMI, healthy-weight reference, daily protein, carbohydrate structure and water intake in seconds.
Your Suggested Starting Structure
Calculated Body Mass Index (BMI)
BMI category
Healthy BMI reference 18.5 – 25.0
Daily protein guide
Carbohydrate starting guide
Daily water intake guide
Understanding your BMI:
Below 18.5 = Underweight  •  18.5–24.9 = Healthy weight  •  25.0–29.9 = Overweight  •  30.0–34.9 = Obesity Class I  •  35.0–39.9 = Obesity Class II  •  40+ = Obesity Class III
Important: BMI is a general screening tool and is not a diagnosis. It does not directly measure body fat, muscle mass, body composition or overall health. These figures are general educational estimates and should be used as a starting point only.

What Does Your BMI Mean?

Body Mass Index (BMI) is a simple screening measure based on your height and weight. For most adults, a BMI of 18.5–24.9 is commonly considered the healthy-weight range, while a BMI of 25 or above falls above that range.

The Lifestyle Optimizer also shows an approximate weight at BMI 25.0, together with practical starting guidance for protein, carbohydrates and daily water intake.

BMI is only one measure. It does not directly assess body fat, muscle mass, fitness or overall health, so use your result as a general reference rather than a diagnosis or prescribed target.

“Beloved, I pray that all may go well with you and that you may be in good health, as it goes well with your soul.” — 3 John 1:2

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