At 145kg the BMI is 47.3 at 175cm and 36.3 at two metres. The boundaries these figures are read against were adopted by the WHO in the 1990s, drawn from European and North American data and chosen as round numbers convenient for comparing populations. Adolphe Quetelet, who devised the underlying index in the 1830s, wa..
= 5ft 8.9in
YOUR RESULTS
BODY MASS INDEX
47.3
Obese Class III
BMI PRIME
1.89
Normal = 0.74–1.00
PONDERAL INDEX
27.1
kg/m³
HEALTHY WEIGHT RANGE
56.7 – 76.3 kg
Lose 68.7 kg to reach healthy weight
Very severely obese. High risk of serious health complications.
BMI GAUGE
YOUR POSITION
FULL SUMMARY
WHO BMI CATEGORIES
The weight is already set to 145kg, which is about 320 pounds. Enter your height and the BMI follows — until you do, the figure is undetermined.
Both unit systems are seeded, so switching between kilograms and pounds keeps the same weight rather than reverting to a default.
Read the band of heights rather than any single BMI. At 145kg the healthy band runs 241 to 280cm, and that band is what a weight actually determines.
A reading near a category boundary should be read as near a boundary. Most people vary by one to two kilograms across a day from food and fluid alone.
At 145kg — about 320 pounds — the BMI is undetermined until a height is supplied. At 150cm it is 64.4, at 175cm 47.3, and at 200cm 36.3: a spread of 28.2 points from one unchanged weight, which is wider than the entire healthy band. Inverting the formula gives what a weight can determine: 145kg sits inside the healthy BMI band for heights between 241cm and 280cm, a window 39cm wide, or roughly 7ft 11in to 9ft 2in. On the WHO 2004 cut-offs for South and East Asian populations the shortest suitable height rises to 252cm, because those thresholds lower the top of the BMI band while leaving 18.5 in place.
FORMULA REFERENCE TABLE
| Name | Formula | Description |
|---|---|---|
| BMI (Metric) | BMI = weight(kg) / height(m)² | Divide weight in kg by height in metres squared |
| BMI (Imperial) | BMI = 703 × weight(lbs) / height(in)² | Multiply weight in pounds by 703, divide by height in inches squared |
| Height in metres | h(m) = h(cm) / 100 | Convert centimetres to metres before squaring |
| BMI Prime | BMI Prime = BMI / 25 | Ratio of BMI to upper limit of normal (25). Values >1.00 indicate overweight |
| Ponderal Index | PI = weight(kg) / height(m)³ | More accurate than BMI for very tall or short individuals. Normal: 11–15 kg/m³ |
| Healthy weight | w = BMI × height(m)² | Rearranged BMI formula: weight(kg) for any target BMI at your height |
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Last updated: August 2, 2026 · Formula verified by EagleCalculator team · Source: WHO Global Database on Body Mass Index · Eagle-eyed accuracy for every calculation.