Is BMI accurate for everyone?

No. BMI does not distinguish muscle from fat, so it can overestimate body fat in very muscular people and underestimate it in older adults with reduced muscle mass. Use it as one signal among several, not a diagnosis.

Why does the calculator show two BMI category tables?

WHO's standard thresholds were derived mostly from European populations. Many Asian-population guidelines use lower cut-offs because health risk rises at a lower BMI in those populations — the tool shows both so you can see how they compare.

Which BMR formula should I use?

Mifflin-St Jeor is generally considered the most accurate for most people today; Katch-McArdle is more precise if you know your body fat percentage, since it uses lean mass instead of total weight.

Is this tool suitable for children or teenagers?

No. BMI for children and teens must be interpreted using age- and sex-specific growth percentile charts, not the adult categories used here — the tool shows a note and adult figures should not be applied to minors.

Does this replace medical or dietary advice?

No. These are general estimates from population formulas for information purposes only. Talk to a doctor, dietitian or other qualified professional about your individual health.

ToolMano

BMI & body metrics calculator

BMI, body fat, BMR, TDEE, ideal weight and more — not medical advice.

No uploadNo signupWorks offline

Quick presets

Sex

Age (years)

Units

Height (cm)

Weight (kg)

BMI

24.5

About bmi & body metrics calculator

BMI & body metrics calculator turns height and weight into body mass index and a full picture of related body metrics: healthy weight range, BMI prime, ponderal index, body surface area (Du Bois, Mosteller and Haycock formulas), and ideal body weight by five different formulas (Devine, Robinson, Miller, Hamwi, BMI-based).

Add waist, hip and neck measurements for waist-to-height and waist-to-hip ratios plus a US Navy body-fat estimate, then get BMR by three formulas (Mifflin-St Jeor, Harris-Benedict, Katch-McArdle), an activity-level-adjusted TDEE, and calorie targets for cutting, maintaining or bulking with a macro split.

Results are shown against both WHO and lower Asian-population BMI category thresholds. This tool is for general information only — it is not medical advice, and does not replace a conversation with a doctor or dietitian, especially for children, teenagers, pregnant people or athletes with unusual muscle mass.

How to use BMI & body metrics calculator

1Choose metric or imperial units and enter your height, weight, age and sex.
2Read your BMI, category and healthy weight range instantly.
3Add waist/hip/neck measurements and activity level in Advanced mode for body fat, BMR and TDEE.
4Pick a calorie goal (cut, maintain or bulk) and a macro split to see your daily targets.

What it does

BMI with both WHO and Asian-population category thresholds
Healthy weight range and weight to lose/gain for a target BMI
BMI prime and ponderal index
Body surface area via Du Bois, Mosteller and Haycock formulas
Ideal body weight via Devine, Robinson, Miller, Hamwi and BMI-based formulas
Waist-to-height and waist-to-hip ratio
US Navy and BMI-based body fat percentage estimates
BMR via Mifflin-St Jeor, Harris-Benedict and Katch-McArdle
Activity-level TDEE and cut/maintain/bulk calorie targets with macro split presets
Water intake estimate and a clear not-medical-advice note

Frequently asked questions

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