BMI for 6′6″ and 120 lb

BMI = 13.9 (Underweight (severe thinness))

An adult who is 6′6″ tall and weighs 120 lb has a body mass index of 13.9. The healthy weight range for this height (BMI 18.5–24.9) is about 160 lb to 215 lb.

US (ft, in, lb) Metric (cm, kg)

Feet Inches Pounds

For adults 20 and over. BMI is a screening measure, not a diagnosis.

How this BMI is calculated

Height in inches: 6 × 12 + 6 = 78 in; squared: 6,084.
BMI = 703 × weight ÷ height²: 703 × 120 ÷ 6,084 = 13.9.

BMI Prime (BMI ÷ 25) is 0.55: values above 1.0 are above the healthy range.

At this height, a weight of 160 lb or more corresponds to a BMI of 18.5 or above.

BMI chart for 6′6″

100 lb	11.6	Underweight (severe thinness)
110 lb	12.7	Underweight (severe thinness)
120 lb	13.9	Underweight (severe thinness)
130 lb	15.0	Underweight (severe thinness)
140 lb	16.2	Underweight (moderate thinness)
150 lb	17.3	Underweight (mild thinness)
160 lb	18.5	Underweight (mild thinness)
170 lb	19.6	Healthy weight
180 lb	20.8	Healthy weight
190 lb	22.0	Healthy weight
200 lb	23.1	Healthy weight
210 lb	24.3	Healthy weight
220 lb	25.4	Overweight
230 lb	26.6	Overweight
240 lb	27.7	Overweight
250 lb	28.9	Overweight
260 lb	30.0	Obesity class I
270 lb	31.2	Obesity class I
280 lb	32.4	Obesity class I
290 lb	33.5	Obesity class I
300 lb	34.7	Obesity class I

BMI categories for adults (WHO)

Under 18.5: underweight
18.5–24.9: healthy weight
25–29.9: overweight
30 or more: obesity (class I 30–34.9, II 35–39.9, III 40+)

For people of Asian descent, health risks rise at lower BMIs, and 23 and 27.5 are often used as action points. BMI does not separate muscle from fat, so very muscular people can have a high BMI without excess fat. It is a screening tool; talk to a health professional about your own situation.

Nearby heights

Frequently asked questions

What is the BMI of someone 6′6″ and 120 lb?

A BMI of 13.9, which the WHO classifies as Underweight (severe thinness) for adults.

How is BMI calculated?

BMI is your weight in kilograms divided by your height in meters squared: BMI = kg ÷ m². In US units, BMI = 703 × pounds ÷ inches².

What is a healthy BMI?

For adults the World Health Organization classes 18.5 to 24.9 as a healthy weight, 25 to 29.9 as overweight and 30 or more as obesity. For people of Asian descent, lower cut-offs (23 and 27.5) are often used for health risk.

Is BMI accurate?

BMI is a quick screening measure, not a diagnosis. It does not distinguish muscle from fat, so it can overestimate fat in athletes and underestimate it in older adults. Waist size and other checks give a fuller picture.