3 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.
3 stone is 19.05 kilograms, or exactly 42 pounds. The full calculation is 3 × 6.35029 = 19.05087 kg, rounded to 19.05 kg.
This is another weight I see looked up for children and animals far more than for adults: a sturdy five-year-old, a big spaniel, a well-stuffed holdall. It also turns up on bathroom scales in homes that still weigh in stone, usually noted mid-journey rather than at the start of one. As with the lighter stone values, an adult BMI table is the wrong tool for a child's weight; growth charts and a health visitor or GP are the right ones. (Curious where the stone itself comes from? Our piece on why the UK still uses stone has the story.)
Reviewed by Dr Muhammad Usman, MBBS
Dr Usman reviews the conversion figures and BMI information on this page for accuracy. This is general information, not medical advice.
Three stone is the last of the small single-digit stones, and it converts without any fuss: 42 lb, 19.05 kg, done. If you are working upward from here, the full stone to kg chart carries on through every value.
Is This a Healthy Weight? BMI by Height
| Height | KG | BMI | NHS Category |
|---|---|---|---|
| 5ft 0in (152cm) | 19.05 kg | 8.2 | Underweight |
| 5ft 2in (157cm) | 19.05 kg | 7.7 | Underweight |
| 5ft 4in (163cm) | 19.05 kg | 7.2 | Underweight |
| 5ft 6in (168cm) (UK avg) | 19.05 kg | 6.7 | Underweight |
| 5ft 8in (173cm) | 19.05 kg | 6.4 | Underweight |
| 5ft 10in (178cm) | 19.05 kg | 6.0 | Underweight |
| 6ft 0in (183cm) | 19.05 kg | 5.7 | Underweight |
| 6ft 2in (188cm) | 19.05 kg | 5.4 | Underweight |
Weights Close to 3 stone
| Stones & Pounds | Kilograms (kg) | Total Pounds |
|---|---|---|
| 2 st 10 lb | 17.24 kg | 38 lbs |
| 2 st 12 lb | 18.14 kg | 40 lbs |
| 3 st 0 lb (This weight) | 19.05 kg | 42 lbs |
| 3 st 2 lb | 19.96 kg | 44 lbs |
| 3 st 4 lb | 20.87 kg | 46 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 3 stone in kg?
19.05 kg. The exact calculation is 3 multiplied by 6.35029, which gives 19.05087 kg.
What is 3 stone in pounds?
Exactly 42 pounds, since a stone is always 14 lb and 3 times 14 is 42.
Is 3 stone a healthy weight for a child?
Kilograms alone cannot say. Age, sex, height and the growth curve all matter, so check the child's growth chart or ask a health visitor or GP.
What is 3 stone close to in everyday terms?
Around 19 kg is a sturdy five-year-old, a large spaniel, or a well-stuffed holdall. It also sits just under 20 kg, a common courier price-break threshold.
How do I convert 3 stone to kg manually?
Multiply the stones by 6.35029. For 3 stone that is 3 times 6.35029, giving 19.05087 kg, which rounds to 19.05 kg.