9 Stone to KG
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Medically ReviewedRounded to 2 decimal places. Standard UK/IE ratio (1 st = 6.35029 kg).
Exact Conversion Formula
Calculation Formula
To convert any other weight from imperial to metric, you can use our primary stone to kg conversion tool for instant results.
9 stone is 57.15 kilograms, or 126 pounds. Multiply 9 by 6.35029 to get 57.1526 kg, rounded to 57.15 kg. Whether this is within the standard adult BMI range depends on height, so the table below provides screening context rather than a diagnosis.
At 9 stone, BMI varies by height. At 5ft 6in (168cm), it is approximately 20.2, within the standard adult healthy range; at 5ft 10in, it is about 18.1, just below the 18.5 threshold. BMI does not capture every aspect of health or body composition.
Is This a Healthy Weight? BMI by Height
| Height | KG | BMI | NHS Category |
|---|---|---|---|
| 5ft 0in (152cm) | 57.2 kg | 24.7 | Healthy Weight |
| 5ft 2in (157cm) | 57.2 kg | 23.2 | Healthy Weight |
| 5ft 4in (163cm) | 57.2 kg | 21.5 | Healthy Weight |
| 5ft 6in (168cm) (UK avg) | 57.2 kg | 20.2 | Healthy Weight |
| 5ft 8in (173cm) | 57.2 kg | 19.1 | Healthy Weight |
| 5ft 10in (178cm) | 57.2 kg | 18.1 | Underweight |
| 6ft 0in (183cm) | 57.2 kg | 17.1 | Underweight |
| 6ft 2in (188cm) | 57.2 kg | 16.2 | Underweight |
Weights Close to 9 Stone
| Stones and Pounds | Kilograms | Total Pounds |
|---|---|---|
| 8 st 8 lb | 54.43 kg | 120 lbs |
| 8 st 10 lb | 55.34 kg | 122 lbs |
| 8 st 12 lb | 56.25 kg | 124 lbs |
| 9 st 0 lb | 57.15 kg | 126 lbs |
| 9 st 2 lb | 58.06 kg | 128 lbs |
| 9 st 4 lb | 58.97 kg | 130 lbs |
| 9 st 6 lb | 59.87 kg | 132 lbs |
| 9 st 8 lb | 60.78 kg | 134 lbs |
| 9 st 10 lb | 61.69 kg | 136 lbs |
| 9 st 12 lb | 62.60 kg | 138 lbs |
For more weight comparisons, see our full stone to kg chart. Need to go the other way? Try our kg to stone converter. You can also check your BMI using our NHS/WHO-aligned BMI calculator.
Related Conversions
Frequently Asked Questions
What is 9 stone in kg?
9 stone is 57.15 kg. The precise calculation is 9 multiplied by 6.35029, giving 57.1526 kg, rounded to 57.15 kg.
What is 9 stone in pounds?
9 stone is exactly 126 pounds. One stone equals 14 pounds, so 9 times 14 equals 126.
Is 9 stone a healthy weight for a 5ft 4in woman?
At 5ft 4in, 9 stone gives a BMI of approximately 21.5, within the standard adult healthy range of 18.5 to 24.9. BMI is a screening measure, not a diagnosis.
Is 9 stone underweight for a man?
For most men of average UK height (5ft 9in or 5ft 10in), yes. At 5ft 10in, 9 stone gives a BMI of 18.1, which is classified as underweight.
A man would need to be 5ft 9in or shorter for 9 stone to be in the healthy weight category.
How do I convert 9 stone 6 pounds to kg?
9 stone 6 pounds is 59.87 kg. Total pounds: 9 times 14 plus 6 equals 132 pounds.
Then 132 multiplied by 0.453592 equals 59.87 kg.