Body Mass Index,
In Proper Clinical Context.
Free body calculators: your BMI and category, the healthy weight range for your height, a realistic weight-change calorie plan, and your BMR.
WHO Baseline Brackets
Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9), and Obesity (30+) bands.
Target Weight Range
Calculates the exact scale weight in pounds or kg needed to achieve a healthy 22.0 BMI.
Muscularity Limitations
Explicit warnings for strength athletes whose dense muscular tissue skews BMI upward.
BmiZone Calculators
BMI Calculator
Body Mass Index with category, healthy range for your height, and the honest context the chart never shows.
Healthy Weight Range Calculator
The full weight range for your height across all four BMI categories — and what each boundary means.
Weight Change Planner
Calories and timeline for reaching a target weight — built on the 3,500-rule with the honesty of a rate limit.
BMR Calculator (Mifflin-St Jeor)
Basal metabolic rate — what your body burns at complete rest — plus TDEE estimates at each activity level.
Evidence-Based Physiology
BMI is a screen, not a diagnosis — and that distinction matters
What BMI was designed for, where it breaks, and the two numbers that complete the picture.
Why slow weight change wins: the physiology of the rate limit
Muscle preservation, metabolic adaptation, and adherence — the three reasons 1% per week beats 3.
12 mistakes people make with BMI and healthy weight
The recurring errors we see in BMI and healthy weight — what causes each one, and the habit that prevents it.