UK weight-loss calculator
kg to stone converter
Convert kilograms to stone and pounds, the way most people in the UK still describe their weight. Type a value into either box to convert in both directions.
Updated
kg = st lb
Displayed values are rounded for readability, but the arithmetic uses the full precision of the internationally defined factors, a pound is exactly 0.45359237 kg and a stone is exactly 14 pounds, so converting back and forth will not drift.
Kilograms to Stone and pounds
11 st 0.3 lb
70 kg converts to the figure on the left, exactly. Nothing in it is an approximation.
About kilograms and stone and pounds
A stone is 14 pounds, and a pound is exactly 0.45359237 kilograms. One stone is therefore 6.35029318 kg.
To go from kilograms to stone, divide by 6.35029318. The whole number is your stone; multiply what is left over by 14 to get the pounds. Most scales that show stone do this for you, but it is worth knowing because a value like "11.5 stone" means 11 stone 7 pounds, not 11 stone 5 pounds.
The half-stone trap
Decimal stone and stone-and-pounds are easy to confuse. 11.5 st is 11 st 7 lb. This converter always gives you stone and pounds, so there is nothing to misread.
The conversion
stone = kg ÷ 6.35029318 (then the remainder becomes pounds)The table below is generated from the same conversion used by the tool above, so the two always agree.
| Kilograms | Stone and pounds |
|---|---|
| 45 kg | 7 st 1.2 lb |
| 50 kg | 7 st 12.2 lb |
| 55 kg | 8 st 9.3 lb |
| 60 kg | 9 st 6.3 lb |
| 65 kg | 10 st 3.3 lb |
| 70 kg | 11 st 0.3 lb |
| 75 kg | 11 st 11.3 lb |
| 80 kg | 12 st 8.4 lb |
| 85 kg | 13 st 5.4 lb |
| 90 kg | 14 st 2.4 lb |
| 95 kg | 14 st 13.4 lb |
| 100 kg | 15 st 10.5 lb |
| 105 kg | 16 st 7.5 lb |
| 110 kg | 17 st 4.5 lb |
| 115 kg | 18 st 1.5 lb |
| 120 kg | 18 st 12.6 lb |
| 125 kg | 19 st 9.6 lb |
| 130 kg | 20 st 6.6 lb |
| 135 kg | 21 st 3.6 lb |
| 140 kg | 22 st 0.6 lb |
A note on rounding
Conversions are shown rounded for readability, weights to a tenth of a unit, heights to the nearest inch or centimetre. The underlying arithmetic uses the full precision of the internationally defined factors, so repeatedly converting back and forth will not drift.
Bathroom scales themselves are usually accurate to within a few hundred grams at best, and body weight varies by a kilogram or more across a single day. That variation is far larger than any rounding here.
Every weight, worked out
The chart above steps in fives. If you want the page for one exact weight, with what it comes to at eight common heights, it is here.
- 40 kg6 st 4.2 lb
- 41 kg6 st 6.4 lb
- 42 kg6 st 8.6 lb
- 43 kg6 st 10.8 lb
- 44 kg6 st 13 lb
- 45 kg7 st 1.2 lb
- 46 kg7 st 3.4 lb
- 47 kg7 st 5.6 lb
- 48 kg7 st 7.8 lb
- 49 kg7 st 10 lb
- 50 kg7 st 12.2 lb
- 51 kg8 st 0.4 lb
- 52 kg8 st 2.6 lb
- 53 kg8 st 4.8 lb
- 54 kg8 st 7 lb
- 55 kg8 st 9.3 lb
- 56 kg8 st 11.5 lb
- 57 kg8 st 13.7 lb
- 58 kg9 st 1.9 lb
- 59 kg9 st 4.1 lb
- 60 kg9 st 6.3 lb
- 61 kg9 st 8.5 lb
- 62 kg9 st 10.7 lb
- 63 kg9 st 12.9 lb
- 64 kg10 st 1.1 lb
- 65 kg10 st 3.3 lb
- 66 kg10 st 5.5 lb
- 67 kg10 st 7.7 lb
- 68 kg10 st 9.9 lb
- 69 kg10 st 12.1 lb
- 70 kg11 st 0.3 lb
- 71 kg11 st 2.5 lb
- 72 kg11 st 4.7 lb
- 73 kg11 st 6.9 lb
- 74 kg11 st 9.1 lb
- 75 kg11 st 11.3 lb
- 76 kg11 st 13.6 lb
- 77 kg12 st 1.8 lb
- 78 kg12 st 4 lb
- 79 kg12 st 6.2 lb
- 80 kg12 st 8.4 lb
- 81 kg12 st 10.6 lb
- 82 kg12 st 12.8 lb
- 83 kg13 st 1 lb
- 84 kg13 st 3.2 lb
- 85 kg13 st 5.4 lb
- 86 kg13 st 7.6 lb
- 87 kg13 st 9.8 lb
- 88 kg13 st 12 lb
- 89 kg14 st 0.2 lb
- 90 kg14 st 2.4 lb
- 91 kg14 st 4.6 lb
- 92 kg14 st 6.8 lb
- 93 kg14 st 9 lb
- 94 kg14 st 11.2 lb
- 95 kg14 st 13.4 lb
- 96 kg15 st 1.6 lb
- 97 kg15 st 3.8 lb
- 98 kg15 st 6.1 lb
- 99 kg15 st 8.3 lb
- 100 kg15 st 10.5 lb
- 101 kg15 st 12.7 lb
- 102 kg16 st 0.9 lb
- 103 kg16 st 3.1 lb
- 104 kg16 st 5.3 lb
- 105 kg16 st 7.5 lb
- 106 kg16 st 9.7 lb
- 107 kg16 st 11.9 lb
- 108 kg17 st 0.1 lb
- 109 kg17 st 2.3 lb
- 110 kg17 st 4.5 lb
- 115 kg18 st 1.5 lb
- 120 kg18 st 12.6 lb
- 125 kg19 st 9.6 lb
- 130 kg20 st 6.6 lb
- 135 kg21 st 3.6 lb
- 140 kg22 st 0.6 lb
- 145 kg22 st 11.7 lb
- 150 kg23 st 8.7 lb
- 155 kg24 st 5.7 lb
- 160 kg25 st 2.7 lb
Related calculators
Frequently asked questions
How many kg are in a stone?
One stone is 6.35029318 kg, because a stone is 14 pounds and a pound is exactly 0.45359237 kg. For everyday purposes 6.35 kg is close enough.
What is 70 kg in stone?
70 kg is 11 stone 0.3 pounds, so in practice a shade over 11 stone. The table below covers the full range if you want a different figure.
Important information
The calculators on this site provide general information and estimates. They are not medical advice and they do not diagnose any condition.
Everyone is different, and individual energy needs vary for reasons these equations cannot capture. If you have a health condition, take medication, are pregnant or breastfeeding, or have any concerns about your weight, speak to your GP, pharmacist or a registered dietitian.