At 50kg the healthy band corresponds to heights between 142 and 164cm — a window 22 centimetres wide. Twenty-two centimetres is a considerable span, and it widens as weight increases: at 100kg the equivalent band is 32cm. That is the same square-root relationship running the other way, and it means a heavier weight is..
= 5ft 8.9in
YOUR RESULTS
BODY MASS INDEX
16.3
Underweight
BMI PRIME
0.65
Normal = 0.74–1.00
PONDERAL INDEX
9.3
kg/m³
HEALTHY WEIGHT RANGE
56.7 – 76.3 kg
Gain 6.7 kg to reach healthy weight
Below a healthy weight range. Consider consulting a healthcare professional.
BMI GAUGE
YOUR POSITION
FULL SUMMARY
WHO BMI CATEGORIES
The weight is already set to 50kg, which is about 110 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 50kg the healthy band runs 142 to 164cm, 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 50kg — about 110 pounds — the BMI is undetermined until a height is supplied. At 150cm it is 22.2, at 175cm 16.3, and at 200cm 12.5: a spread of 9.7 points from one unchanged weight, which is wider than the entire healthy band. Inverting the formula gives what a weight can determine: 50kg sits inside the healthy BMI band for heights between 142cm and 164cm, a window 22cm wide, or roughly 4ft 8in to 5ft 5in. On the WHO 2004 cut-offs for South and East Asian populations the shortest suitable height rises to 148cm, 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.