At 70kg the BMI runs from 31.1 at 150cm to 17.5 at two metres — a spread of 13.6 points, which covers three of the four WHO categories. Seventy kilograms is also the figure this calculator starts from when no weight is supplied, which makes it a good illustration of why a default is not an answer. The healthy heights ..
= 5ft 8.9in
YOUR RESULTS
BODY MASS INDEX
22.9
Normal weight
BMI PRIME
0.91
Normal = 0.74–1.00
PONDERAL INDEX
13.1
kg/m³
HEALTHY WEIGHT RANGE
56.7 – 76.3 kg
Within the healthy weight range. Maintain with balanced diet and regular exercise.
BMI GAUGE
YOUR POSITION
FULL SUMMARY
WHO BMI CATEGORIES
The weight is already set to 70kg, which is about 154 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 70kg the healthy band runs 168 to 195cm, 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 70kg — about 154 pounds — the BMI is undetermined until a height is supplied. At 150cm it is 31.1, at 175cm 22.9, and at 200cm 17.5: a spread of 13.6 points from one unchanged weight, which is wider than the entire healthy band. Inverting the formula gives what a weight can determine: 70kg sits inside the healthy BMI band for heights between 168cm and 195cm, a window 27cm wide, or roughly 5ft 6in to 6ft 5in. On the WHO 2004 cut-offs for South and East Asian populations the shortest suitable height rises to 175cm, 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.