At five foot eleven, the healthy range is about 133 to 179 pounds. Five foot eleven is a height people are unusually specific about, and it is worth noting that the one inch to six foot changes the healthy range by about four pounds at each end. That is smaller than the difference between two sets of bathroom scales. ..
= 180.3 cm
YOUR RESULTS
BODY MASS INDEX
21.5
Normal weight
BMI PRIME
0.86
Normal = 0.74–1.00
HEALTHY WEIGHT RANGE
133 – 179 lbs
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 5 ft 11 in, which is 180cm. 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 46 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 5 ft 11 in — 71 inches, or 180cm — a BMI of 18.5 puts the lower bound at 60.2kg (133 lb) and a BMI of 24.9 puts the upper bound at 81.0kg (179 lb). The window is 20.8kg, or about 46 lb. One pound moves the number by 0.14 of a point, so it takes roughly 7 pounds to cross a whole one. On the WHO 2004 cut-offs for Asian populations the upper bound drops to 74.5kg (164 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.