BMI Guides

The calculator gives you a number in seconds; these guides cover what the number actually means for your situation — sex, age, build and background all change the reading.

BMI for Women

Same scale, different body — body fat, pregnancy, menopause and what they change.

BMI for Men

Muscle pushes the number up, belly fat hides behind it. Telling the two apart.

BMI for Children & Teens

Why kids use percentiles, not the adult cut-offs — and how to read the charts.

BMI by Age

What changes at 30, 50 and 65+ — including the older-adult 23–28 evidence.

Asian BMI Cut-offs

Why 23 is the new 25 for a third of the world — WHO action points, country by country.

BMI vs Body Fat

What each measures, healthy body-fat ranges, and the four disagreement cases.

BMI for Athletes

Why muscular people read as overweight, sport by sport — and better checks.

Ideal Weight by Height

The BMI range vs the classic Devine, Robinson and Hamwi formulas.

How to Lower BMI Safely

Realistic rates, what actually moves the number, and what to avoid.

BMI Prime

Divide by 25 and the number explains itself — the ratio version of BMI.

History of BMI

From Quetelet's 1832 index to Keys, the WHO cut-offs and the odd 703.

Also see the BMI chart with healthy weight ranges by height, or start with the BMI calculator.

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