BMI for 170 cm and 120 kg
BMI = 41.5 (Obesity class III)
An adult who is 170 cm tall and weighs 120 kg has a body mass index of 41.5. The healthy weight range for this height (BMI 18.5–24.9) is about 53.5 kg to 72 kg.
For adults 20 and over. BMI is a screening measure, not a diagnosis.
How this BMI is calculated
- Height in meters: 1.7 m; squared: 2.89 m².
- BMI = weight ÷ height²: 120 ÷ 2.89 = 41.5.
BMI Prime (BMI ÷ 25) is 1.66: values above 1.0 are above the healthy range.
At this height, a weight of 72 kg or less corresponds to a BMI under 25.
BMI chart for 170 cm
| 45 kg | 15.6 | Underweight (severe thinness) |
| 50 kg | 17.3 | Underweight (mild thinness) |
| 55 kg | 19.0 | Healthy weight |
| 60 kg | 20.8 | Healthy weight |
| 65 kg | 22.5 | Healthy weight |
| 70 kg | 24.2 | Healthy weight |
| 75 kg | 26.0 | Overweight |
| 80 kg | 27.7 | Overweight |
| 85 kg | 29.4 | Overweight |
| 90 kg | 31.1 | Obesity class I |
| 95 kg | 32.9 | Obesity class I |
| 100 kg | 34.6 | Obesity class I |
| 105 kg | 36.3 | Obesity class II |
| 110 kg | 38.1 | Obesity class II |
| 115 kg | 39.8 | Obesity class II |
| 120 kg | 41.5 | Obesity class III |
| 125 kg | 43.3 | Obesity class III |
| 130 kg | 45.0 | Obesity class III |
| 135 kg | 46.7 | Obesity class III |
| 140 kg | 48.4 | Obesity class III |
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 170 cm and 120 kg?
A BMI of 41.5, which the WHO classifies as Obesity class III 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.