At 178cm the healthy range is 58.6 to 78.9kg. The boundaries at 18.5 and 25 were adopted by the WHO in the 1990s, drawn largely from European and North American data collected across the twentieth century. They were chosen as round numbers convenient for classifying populations, not discovered as points where somethin..
= 5ft 10.1in
YOUR RESULTS
BODY MASS INDEX
22.1
Normal weight
BMI PRIME
0.88
Normal = 0.74–1.00
PONDERAL INDEX
12.4
kg/m³
HEALTHY WEIGHT RANGE
58.6 – 78.9 kg
Within the healthy weight range. Maintain with balanced diet and regular exercise.
BMI GAUGE
YOUR POSITION
FULL SUMMARY
WHO BMI CATEGORIES
The height is already set to 178cm, which is about 5 ft 10 in. Change it if that is not yours and everything below recalculates.
Enter a weight in kilograms. Switching to imperial converts the height to the nearest inch, which is a coarser step — two adjacent even centimetre values can land on the same one.
Read the range before the category. At this height it spans 20.3kg, and every weight inside produces the same verdict.
Treat a reading near a boundary as near a boundary. One kilogram is 0.32 of a point here, and most people vary by more than that across a day.
At 178cm — 1.78m, or about 5 ft 10 in — a BMI of 18.5 puts the lower bound at 58.6kg and a BMI of 24.9 puts the upper bound at 78.9kg. The window is 20.3kg, or about 45 pounds. One kilogram moves the number by 0.32 of a point, so it takes roughly 3.2kg to cross a whole one. On the WHO 2004 cut-offs for South and East Asian populations the upper bound drops to 72.6kg, a reduction of 6.3kg, with the lower bound unchanged.
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.