BMI for 45 kg and 150 cm
Instant answer: A person who weighs 45 kg (99 lbs) and is 150 cm (4'11") tall has a BMI of 20.0, classified as normal weight.
At 150 cm, the BMI-based healthy weight range spans 41.6 kg to 56 kg, with the midpoint considered the most statistically protective.
What the numbers mean for you
You have 11.3 kg (25 lbs) of headroom before crossing into overweight (BMI 25 = 56.3 kg (124 lbs)).
Your BMI band midpoint is BMI 21.7 (48.8 kg (108 lbs)), often used as the "most protective" reference in cohort studies.
Timelines assume ~7,700 kcal per kg of body fat. Real progress varies with muscle mass, adherence, and medications.
What does a BMI of 20.0 mean?
Staying inside this band is associated with the most favourable metabolic markers in adult populations under 65.
BMI is a screening tool, not a diagnosis. Two people at 45 kg and 150 cm can have very different body compositions and very different health profiles. Use BMI alongside waist circumference, fitness level, and routine bloodwork.
Waist matters more than the scale
Two people can share the same BMI and have very different metabolic risk. For that reason, waist circumference is now considered a stronger predictor of cardiometabolic disease than BMI alone.
- Waist-to-height rule: keep your waist under half your height — that means below 75 cm (30") at 150 cm.
- Absolute cutoff for most adults: waist under 94 cm (37") is associated with meaningfully lower risk of type 2 diabetes and cardiovascular disease.
- Higher-risk zone: waist above 102 cm (40") — this is where risk climbs sharply regardless of BMI.
Healthy weight range for 150 cm
The BMI-based healthy weight range for 150 cm tall adults is 41.6–56 kg (92–123 lbs).
| Weight | In lbs | BMI | Category |
|---|---|---|---|
| 35 kg | 77 lbs | 15.6 | Underweight |
| 40 kg | 88 lbs | 17.8 | Underweight |
| 45 kg (this page) | 99 lbs | 20.0 | Normal weight |
| 50 kg | 110 lbs | 22.2 | Normal weight |
| 55 kg | 121 lbs | 24.4 | Normal weight |
| 60 kg | 132 lbs | 26.7 | Overweight |
Precise ±5 kg neighbours at this height
| Weight | Conversion | BMI | Category |
|---|---|---|---|
| 40 kg | 88 lbs | 17.8 | Underweight |
| 41 kg | 90 lbs | 18.2 | Underweight |
| 42 kg | 93 lbs | 18.7 | Normal weight |
| 43 kg | 95 lbs | 19.1 | Normal weight |
| 44 kg | 97 lbs | 19.6 | Normal weight |
| 45 kg ← this page | 99 lbs | 20.0 | Normal weight |
| 46 kg | 101 lbs | 20.4 | Normal weight |
| 47 kg | 104 lbs | 20.9 | Normal weight |
| 48 kg | 106 lbs | 21.3 | Normal weight |
| 49 kg | 108 lbs | 21.8 | Normal weight |
| 50 kg | 110 lbs | 22.2 | Normal weight |
Practical next steps
- Continue current habits; this BMI band is associated with the lowest health risk.
- Focus on protein intake (0.8–1 g per kg) and quality sleep.
- Track waist circumference rather than weight as you age.
- Annual labs are still worthwhile even at a healthy weight.
Frequently asked questions
What is the BMI for 45 kg and 150 cm?
Using the formula BMI = weight (kg) ÷ height (m)², a person who weighs 45 kg and is 150 cm tall has a BMI of 20.0. This places them in the normal weight category as defined by the World Health Organization.
Is 45 kg a healthy weight at 150 cm?
The healthy weight range for 150 cm is 41.6–56 kg, corresponding to a BMI of 18.5–24.9. 45 kg gives a BMI of 20.0, which is normal weight.
How was this BMI calculated?
BMI = 45 ÷ (1.50 × 1.50) = 45 ÷ 2.2500 = 20.0.
What should I do if my BMI is 20.0?
Continue current habits; this BMI band is associated with the lowest health risk. Focus on protein intake (0.8–1 g per kg) and quality sleep.