4 Stone to KG
Conversion Result
Exact Conversion
4 stone = 25.40 kg
To convert any other weight from imperial to metric, you can use our primary stone to kg conversion tool for instant results.
4 stone is 25.40 kilograms. To verify this yourself, multiply 4 by 6.35029 and you get 25.4012, which rounds to 25.40 kg. This is also equal to 56 pounds. In everyday UK life, 4 stone is a weight that comes up most often when parents are tracking a young child’s growth, when checking a child against NHS growth charts, or when someone is monitoring weight changes during illness or recovery.
For adults, 4 stone sits well below any healthy weight range at any height. For a reference point, the NHS defines underweight as a BMI below 18.5, and at 4 stone, even a person of 4ft 10in would have a BMI well below this. However this weight is entirely normal for children. A child of around 4 to 6 years old may weigh close to 4 stone, depending on their build and height. If you are looking at this conversion for a child, always use an age-specific NHS growth chart rather than adult BMI tables, as the two are not comparable.
Dr Muhammad Usman, MBBS
4 stone in an adult context is a weight that would raise immediate clinical concern. It falls far below the underweight threshold at every adult height. In a child context however it is perfectly reasonable. The reason people search for this conversion varies widely. Some are parents checking a child’s weight before a GP appointment. Others are people tracking weight loss or gain during illness. Whatever the reason, if you are an adult at or near 4 stone and concerned about your weight, please speak to your GP as a matter of priority.
Is This a Healthy Weight? BMI by Height
| Height | KG | BMI | NHS Category |
|---|---|---|---|
| 5ft 0in (152cm) | 25.4 kg | 11.0 | Underweight |
| 5ft 2in (157cm) | 25.4 kg | 10.3 | Underweight |
| 5ft 4in (163cm) | 25.4 kg | 9.6 | Underweight |
| 5ft 6in (168cm) (UK avg) | 25.4 kg | 9.0 | Underweight |
| 5ft 8in (173cm) | 25.4 kg | 8.5 | Underweight |
| 5ft 10in (178cm) | 25.4 kg | 8.0 | Underweight |
| 6ft 0in (183cm) | 25.4 kg | 7.6 | Underweight |
| 6ft 2in (188cm) | 25.4 kg | 7.2 | Underweight |
Weights Close to 4 Stone
| Stones and Pounds | Kilograms | Total Pounds |
|---|---|---|
| 3 st 8 lb | 22.68 kg | 50 lbs |
| 3 st 10 lb | 23.59 kg | 52 lbs |
| 3 st 12 lb | 24.49 kg | 54 lbs |
| 4 st 0 lb | 25.40 kg | 56 lbs |
| 4 st 2 lb | 26.31 kg | 58 lbs |
| 4 st 4 lb | 27.22 kg | 60 lbs |
| 4 st 6 lb | 28.12 kg | 62 lbs |
| 4 st 8 lb | 29.03 kg | 64 lbs |
| 4 st 10 lb | 29.94 kg | 66 lbs |
| 4 st 12 lb | 30.84 kg | 68 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 4 stone in kg?
4 stone is 25.40 kg. The precise figure is 25.4012 kg, calculated by multiplying 4 by the conversion factor of 6.35029.
What is 4 stone in pounds?
4 stone equals exactly 56 pounds. One stone is exactly 14 pounds, so 4 multiplied by 14 equals 56.
Is 4 stone a healthy weight for an adult?
No. For any adult at any height, 4 stone is severely underweight. At 4 stone, even a very short adult would have a BMI far below 18.5, which is the NHS lower threshold for healthy weight. If an adult weighs 4 stone, a GP appointment is urgent.
Is 4 stone normal for a child?
Yes, depending on the child's age. A child aged around 4 to 6 years old may weigh approximately 4 stone. Always check a child's weight against the NHS age-specific growth charts, which account for the normal range at each age. Adult BMI tables do not apply to children.
How do I convert 4 stone to kg manually?
Multiply 4 by 6.35029. The result is 25.4012, which rounds to 25.40 kg. For a quick estimate, multiply 4 by 6.35 to get 25.4 kg.