BMI for 170 cm and 90 kg
A person 170 cm (5'7") tall weighing 90 kg (198 lbs) has a BMI of 31.1 — classified as Obese. The healthy weight range for this height is 53.5–72.0 kg.
Your BMI score
Quick health screening — not a diagnosis
Your BMI falls within class I obesity, with elevated long-term health risk.
What this means
BMI is a quick screening number based only on height and weight. It doesn't distinguish muscle from fat, and shouldn't replace a clinical assessment.
- 18.5–24.9 generally lowest health risk
- 25–29.9 elevated metabolic risk
- 30+ higher long-term risk
BMI range
WHO adult classification
- Severe thinness< 16
- Underweight16 – 18.5
- Normal18.5 – 24.9
- Overweight25 – 29.9
- YouObese I30 – 34.9
- Obese II35 – 39.9
- Obese III≥ 40
What does this BMI mean?
Obesity class I · BMI 31.1 · Obese
31.1 is in the class-I obesity band. For 170 cm, this is the first obesity tier — typically the easiest to move out of with sustained changes.
Sustained BMI in the obese range is linked with higher risk for several chronic conditions — type-2 diabetes, sleep apnea, cardiovascular disease, joint stress. The good news is that even modest, sustained weight loss (5–10%) tends to produce outsized health benefits.
Treat this as a starting point, not a verdict. BMI ignores muscle mass, body shape, and individual context — it's a quick number for a population, not a personal health score.
For someone 170 cm tall, weights between 53.5 kg and 72.0 kg fall in the BMI 18.5–24.9 healthy range — roughly 118–159 lbs.
How far from the healthy range?
Target BMI milestones
Weights that would land at common BMI thresholds for 170 cm.
| Milestone | Target weight | vs current |
|---|---|---|
| BMI 40 (class III threshold) | 115.6 kg(255 lbs) | Gain ~25.6 kg |
| BMI 35 (class II threshold) | 101.1 kg(223 lbs) | Gain ~11.1 kg |
| BMI 30 (obesity threshold) | 86.7 kg(191 lbs) | Lose ~3.3 kg |
| BMI 25 (healthy range) | 72.3 kg(159 lbs) | Lose ~17.8 kg |
Why BMI isn't the whole story
- Muscle vs fat: BMI treats a kilogram of muscle the same as a kilogram of fat. Strength athletes and very muscular builds can land in the overweight band while having low body fat.
- Body shape matters: Two people at the same BMI can carry weight very differently. Waist circumference and waist-to-height ratio capture risk that BMI misses.
- Age, sex, ethnicity: The 18.5–24.9 window is a single global average. Cutoffs adjusted for ethnicity and age can shift the interpretation, especially at the edges of the band.
- Still useful: BMI remains widely used because it's cheap, fast, and roughly predictive at population scale. Treat it as a self-check signal, not a diagnosis.
Nearby BMI combinations
Related
Common questions
Last updated: 2026