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.

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 Guide

How to Use the BMI Calculator (Body Mass Index): Practical Guide & Visual Analysis

Calculate Body Mass Index (kg/m²) using metric (kg/cm) or US imperial (lbs/inches) measurements, view where your result sits on the WHO reference scale, and review clinical limitations. Whether you are researching body mass index, healthy weight calculator, ideal weight for height, overweight calculator, asian bmi calculator, this interactive tool helps you calculate adult Body Mass Index (BMI) in metric or US units, compare against both WHO and Asia-Pacific/Indian thresholds, and see the healthy weight range for a given height.

Interpreting the 3 Custom Visual Graphs & Key Outputs

As you adjust Measurement Units, Body Weight (kg or lbs), Height (cm or inches), the calculator immediately computes Body Mass Index (kg/m²), WHO Adult Classification, Asia-Pacific / Indian Classification, Healthy Weight Range for Height, Ponderal Index (kg/m³) and updates all three domain-specific SVG charts in real time. Instead of relying on a single static figure, you can inspect the primary domain diagram, component breakdown, and multi-point trajectory curve to see how changing your inputs shifts the final result. Use the Compare (up to 3 scenarios) button to evaluate side-by-side variations before making a decision.

Real-World Benchmark & Planning Tips (Global (WHO Standard) & Asia-Pacific / India Consensus)

In our benchmark scenario (Adult Weighing 70 kg at 172 cm (1.72 m) Height), BMI is 23.7 kg/m², with a WHO normal weight interval of 54.7 – 73.7 kg. Keep in mind that applies to non-pregnant adults aged 18 years and older. For related calculations in Health & Fitness, explore Calorie Needs & TDEE Calculator, Age Calculator, Unit Conversion Calculator.