BMI Calculator (Body Mass Index)

Compute BMI, Ponderal Index, and healthy weight range with both global WHO and Asia-Pacific/Indian clinical screening thresholds.

Body Mass Index (BMI)
23.7 kg/m²
WHO Classification: Normal weight (18.5–24.9)
WHO Adult Category Normal weight (18.5–24.9)
Asia-Pacific / Indian Cutoff Overweight / At-Risk (23.0–24.9)
WHO Normal Weight Range 54.7 – 73.7 kg
Ponderal Index 13.76 kg/m³
Inputs
Select kg/cm or lbs/in.
kg / lbs
Enter weight in kg (metric) or lbs (imperial).
cm / in
Enter height in cm (e.g., 172 cm) or total inches (e.g., 68 in).
Results & Graph
Body Mass Index (BMI)
23.7 kg/m²
WHO Classification: Normal weight (18.5–24.9)
WHO Adult Category
Normal weight (18.5–24.9)
Asia-Pacific / Indian Cutoff
Overweight / At-Risk (23.0–24.9)
WHO Normal Weight Range
54.7 – 73.7 kg
Ponderal Index
13.76 kg/m³

WHO Adult BMI Reference Scale (kg/m²)

Position of your BMI relative to standard adult screening thresholds
Graph 1 • WHO & Asia-Pacific BMI Screening Scale Shows where your BMI sits across clinical cutoffs
Underweight 12 Normal (WHO) 18.5 Overweight 25 Obese 30 40 23.66 kg/m²
Graph 2 • 2D Height vs. Weight BMI Contour Map Plots your exact (Height, Weight) coordinate against BMI 18.5, 25, and 30 contours
BMI 18.5 BMI 25.0 BMI 30.0 You: 172 cm, 70.0 kg (23.7) Standing Height (145 cm → 200 cm) vs. Body Weight (40 kg → 130 kg)
Graph 3 • Healthy Weight Benchmarks for 172 cm Height Compares your weight against WHO and Asia-Pacific normal ceilings
Your Current Weight 70.0 kg (BMI 23.7) Minimum Healthy Weight (BMI 18.5) 54.7 kg Midpoint Ideal Weight (BMI 21.7) 64.2 kg Asia-Pacific Normal Ceiling (BMI 22.9) 67.7 kg WHO Global Normal Ceiling (BMI 24.9) 73.7 kg
Summary: BMI of 23.7 kg/m² lies in the Normal weight (18.5–24.9) zone on the WHO 12 to 40 kg/m² reference scale.
Summary: At 70 kg and 172 cm, your BMI is 23.7 kg/m², which falls in the WHO "Normal weight (18.5–24.9)" range (and "Overweight / At-Risk (23.0–24.9)" under Asia-Pacific/Indian clinical consensus guidelines). For your height, a WHO BMI between 18.5 and 24.9 corresponds to 54.7–73.7 kg.
⚠️ Clinical Limitation Notice: BMI is a population-level screening ratio of weight to height squared. It does not distinguish skeletal muscle mass from adipose tissue or measure visceral fat distribution, and should not be used as a standalone medical diagnosis.
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Formula & Mathematical Methodology: Quetelet Body Mass Index & Ponderal Index Equations

BMImetric = Weight (kg)[Height (m)]2,   BMIUS = 703 × Weight (lb)[Height (in)]2
BMI = weight (kg) / [ height (m) ]²; Imperial: BMI = 703 × weight (lb) / [ height (in) ]²
  • weight: Body mass in kilograms (or pounds × 0.45359237)
  • height: Standing height in meters (centimeters ÷ 100)

Rounding: BMI is displayed to 1 decimal place; Ponderal Index to 2 decimal places.

Worked Example: Adult Weighing 70 kg at 172 cm (1.72 m) Height

An adult measures 70 kg and 172 cm tall.

  1. Square the height in meters: 1.72 × 1.72 = 2.9584 m².
  2. Divide weight by squared height: 70 ÷ 2.9584 = 23.66 kg/m².
  3. Compare against cutoffs: 23.7 kg/m² is Normal under global WHO cutoffs (18.5–24.9) and Overweight/At-Risk under Asia-Pacific/Indian cutoffs (23.0–24.9).
Result: BMI is 23.7 kg/m², with a WHO normal weight interval of 54.7 – 73.7 kg.

Frequently Asked Questions

Why are Asia-Pacific and Indian BMI cutoffs lower than global WHO cutoffs?

Epidemiological studies consulted by the WHO showed that South Asian and East Asian populations experience elevated cardiometabolic and type-2 diabetes risk at lower BMI levels (starting around 23.0 kg/m²) due to higher visceral body fat percentages at a given weight.

Does a normal BMI guarantee metabolic health?

No. BMI is an initial anthropometric screening ratio, not a diagnostic test. Waist circumference, blood pressure, lipid profile, and fasting glucose provide essential clinical context.

Health & Fitness · Body Composition & Clinical Screening

BMI Calculator (Body Mass Index): inputs, method, and how to read the result

Compute BMI, Ponderal Index, and healthy weight range with both global WHO and Asia-Pacific/Indian clinical screening thresholds.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Measurement Units: Select kg/cm or lbs/in.
  • Body Weight (kg or lbs): Enter weight in kg (metric) or lbs (imperial).
  • Height (cm or inches): Enter height in cm (e.g., 172 cm) or total inches (e.g., 68 in).

What the calculation includes

With the default values shown, Body Mass Index (BMI) is 23.7 kg/m². The calculation follows Quetelet Body Mass Index & Ponderal Index Equations; the formula and variable definitions above show how the inputs combine.

One-input check: With the other defaults held constant, changing Measurement Units from Metric (Kilograms & Centimeters) to US / Imperial (Pounds & Inches) changes Body Mass Index (BMI) from 23.7 kg/m² to 1.7 kg/m². This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Applies to non-pregnant adults aged 18 years and older.
  • BMI does not distinguish lean muscle mass from fat mass; strength athletes frequently register ≥25 kg/m² despite low body fat.

Scope: Global (WHO Standard) & Asia-Pacific / India Consensus Check the assumptions and limitations against your situation before relying on the estimate.

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