BMI of 20 — What does it mean?
Instant answer: A BMI of 20 is classified as normal weight.
Staying inside this band is associated with the most favourable metabolic markers in adult populations under 65.
Weight examples that give a BMI of 20
| Height | Weight (kg) | Weight (lbs) |
|---|---|---|
| 160 cm (5'3") | 51.2 | 113 |
| 165 cm (5'5") | 54.5 | 120 |
| 170 cm (5'7") | 57.8 | 127 |
| 175 cm (5'9") | 61.3 | 135 |
| 180 cm (5'11") | 64.8 | 143 |
| 185 cm (6'1") | 68.5 | 151 |
Practical next steps
- This BMI band is the one associated with the lowest all-cause mortality in large cohort studies.
- Protein intake around 0.8–1 g per kg is the commonly cited maintenance figure for adults.
- Waist circumference often changes before scale weight does as people age.
- A healthy BMI does not rule out raised blood pressure, glucose or lipids; those need measuring separately.
Frequently asked questions
What does a BMI of 20 mean?
A BMI of 20 falls into the normal weight category as defined by the World Health Organization. Staying inside this band is associated with the most favourable metabolic markers in adult populations under 65.
Is a BMI of 20 healthy?
Yes — this BMI is within the WHO healthy range (18.5–24.9).
What weight gives a BMI of 20 at 170 cm?
At 170 cm, a BMI of 20 corresponds to roughly 57.8 kg.