At five foot eight, the healthy range is about 122 to 164 pounds. If the number that comes out of that range concerns you, the more useful next measurement is a tape around the waist rather than another calculation from the same two inputs. Waist circumference responds to where weight sits — and where it sits is what ..
= 172.7 cm
YOUR RESULTS
BODY MASS INDEX
23.4
Normal weight
BMI PRIME
0.94
Normal = 0.74–1.00
HEALTHY WEIGHT RANGE
122 – 164 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 8 in, which is 173cm. 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 42 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 8 in — 68 inches, or 173cm — a BMI of 18.5 puts the lower bound at 55.2kg (122 lb) and a BMI of 24.9 puts the upper bound at 74.3kg (164 lb). The window is 19.1kg, or about 42 lb. One pound moves the number by 0.15 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 68.3kg (151 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.