At 166cm the healthy range is 51.0 to 68.6kg. Most people record their height to the nearest centimetre, and that rounding is worth a quarter of a BMI point here — comparable to a kilogram of weight. Half a centimetre of measurement error, which is easy to accumulate standing slightly off the wall, is worth about an e..
= 5ft 5.4in
YOUR RESULTS
BODY MASS INDEX
25.4
Overweight
BMI PRIME
1.02
Normal = 0.74–1.00
PONDERAL INDEX
15.3
kg/m³
HEALTHY WEIGHT RANGE
51.0 – 68.6 kg
Lose 1.4 kg to reach healthy weight
Above healthy range. Lifestyle changes may reduce health risks.
BMI GAUGE
YOUR POSITION
FULL SUMMARY
WHO BMI CATEGORIES
The height is already set to 166cm, which is about 5 ft 5 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 17.6kg, and every weight inside produces the same verdict.
Treat a reading near a boundary as near a boundary. One kilogram is 0.36 of a point here, and most people vary by more than that across a day.
At 166cm — 1.66m, or about 5 ft 5 in — a BMI of 18.5 puts the lower bound at 51.0kg and a BMI of 24.9 puts the upper bound at 68.6kg. The window is 17.6kg, or about 39 pounds. One kilogram moves the number by 0.36 of a point, so it takes roughly 2.8kg to cross a whole one. On the WHO 2004 cut-offs for South and East Asian populations the upper bound drops to 63.1kg, a reduction of 5.5kg, 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.