BMI for 170 cm and 55 kg
A person 170 cm (5'7") tall weighing 55 kg (121 lbs) has a BMI of 19.0 — classified as Normal. 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 the healthy range for most adults.
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
- YouNormal18.5 – 24.9
- Overweight25 – 29.9
- Obese I30 – 34.9
- Obese II35 – 39.9
- Obese III≥ 40
What does this BMI mean?
Lower end of healthy range · BMI 19.0 · Normal
A BMI of 19.0 sits at the lower end of the standard healthy range (18.5–24.9). At 170 cm, 55 kg is comfortably inside the band where most adults have the lowest BMI-related health risk.
This band is what large population studies tend to treat as the reference range. For most adults, it's the lowest-risk zone, though athletes and very lean individuals are common exceptions.
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?
55 kg sits inside the standard healthy weight range (53.5–72.0 kg) for 170 cm. There's about 17.0 kg of headroom before the BMI 25 line and 1.5 kg of buffer above the BMI 18.5 line.
Target BMI milestones
Weights that would land at common BMI thresholds for 170 cm.
| Milestone | Target weight | vs current |
|---|---|---|
| BMI 18.5 (lower healthy bound) | 53.5 kg(118 lbs) | Lose ~1.5 kg |
| BMI 22 (mid-healthy) | 63.6 kg(140 lbs) | Gain ~8.6 kg |
| BMI 25 (upper healthy bound) | 72.3 kg(159 lbs) | Gain ~17.3 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