At six foot six, the healthy BMI range runs from about 160 to 215 pounds — a window of roughly 55 pounds, and the widest on this set of pages. That is nearly seventy percent more room than the 33 pounds allowed at five foot exactly, from the same unchanged rule. Which makes the point that BMI is not a single standard ..
= 198.1 cm
YOUR RESULTS
BODY MASS INDEX
17.8
Underweight
BMI PRIME
0.71
Normal = 0.74–1.00
HEALTHY WEIGHT RANGE
160 – 215 lbs
Gain 6.1 lbs to reach healthy weight
Below a healthy weight range. Consider consulting a healthcare professional.
BMI GAUGE
YOUR POSITION
FULL SUMMARY
WHO BMI CATEGORIES
The height is already set to 6 ft 6 in, which is 198cm. Change it if that is not yours and everything below recalculates.
Enter a weight in whichever units suit you. The two systems give the same answer to about four significant figures — the imperial form uses a rounded conversion constant.
Read the range before the category. At this height it spans about 55 lb, and every weight inside it produces the same verdict from the measure.
Treat a reading near a boundary as near a boundary. Daily variation in weight and height covers a few tenths of a BMI point on its own.
At 6 ft 6 in — 78 inches, or 198cm — a BMI of 18.5 puts the lower bound at 72.6kg (160 lb) and a BMI of 24.9 puts the upper bound at 97.7kg (215 lb). The window is 25.1kg, or about 55 lb. One pound moves the number by 0.12 of a point, so it takes roughly 9 pounds to cross a whole one. On the WHO 2004 cut-offs for Asian populations the upper bound drops to 89.9kg (198 lb), 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.