Ideal height and BMI for 51 kg adults
51 kg is a healthy weight if you're between 143 cm and 166 cm tall (a BMI of 18.5 to 24.9).
If you're shorter than 143 cm, 51 kg gives you a BMI of 25 or more. If you're taller than 166 cm, your BMI is under 18.5.
Over means overweight. Under means underweight.
Your BMI at 51 kg, by height
We show BMI to one decimal place without rounding up, so 24.96 shows as 24.9 and counts as a healthy weight.
| Height | BMI | Category |
|---|---|---|
| 135 cm | 27.9 | Overweight |
| 138 cm | 26.7 | Overweight |
| 141 cm | 25.6 | Overweight |
| 144 cm | 24.5 | Healthy weight |
| 147 cm | 23.6 | Healthy weight |
| 150 cm | 22.6 | Healthy weight |
| 153 cm | 21.7 | Healthy weight |
| 156 cm | 20.9 | Healthy weight |
| 159 cm | 20.1 | Healthy weight |
| 162 cm | 19.4 | Healthy weight |
| 165 cm | 18.7 | Healthy weight |
| 168 cm | 18.0 | Underweight |
| 171 cm | 17.4 | Underweight |
| 174 cm | 16.8 | Underweight |
| 177 cm | 16.2 | Underweight |
| 180 cm | 15.7 | Underweight |
| 183 cm | 15.2 | Underweight |
| 186 cm | 14.7 | Underweight |
| 189 cm | 14.2 | Underweight |
| 192 cm | 13.8 | Underweight |
| 195 cm | 13.4 | Underweight |
| 198 cm | 13.0 | Underweight |
What it means
A healthy weight fits a range of heights. At a given weight, your BMI goes down as your height goes up. The heights in your answer are the ones that give a BMI of 18.5 to 24.9.
We don't round BMI up. We show BMI to one decimal place and drop the rest instead of rounding. So 24.96 shows as 24.9 and still counts as a healthy weight.
BMI doesn't tell the whole story. BMI doesn't account for muscle, bone, age or sex. Two adults with the same BMI can have different health.
How BMI works
- BMI is your weight divided by your height squared. If you use pounds and inches, multiply the result by 703.
- For the most accurate number, weigh yourself in the morning and measure your height without shoes.
- Your category comes from the BMI with the extra decimals dropped, not rounded.
Nearby weights
Common questions
Short answers about how these calculators work.
Why is 24.9 healthy but 25.0 overweight? The CDC defines a healthy weight as a BMI of 18.5 to 24.9 and overweight as 25.0 to 29.9. We drop extra decimals, so 24.96 stays 24.9.
Is BMI a diagnosis? No. The CDC describes BMI as a screening tool. It doesn't measure body fat, and it can't diagnose a health condition.
Sources
Where these numbers come from
- About adult BMI (opens in a new tab) - CDCBMI categories for adults
- Calculate your BMI (opens in a new tab) - National Heart, Lung, and Blood InstituteHow BMI is calculated for adults
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