Weight converter
Stones to Kilograms
Stones and Kilograms measure the same quantity in different unit systems. The relationship is 1 st = 6.350293 kg, which gives 6.350293 kg per st. Below you can convert any value, check a worked example and read the full chart.
Formula 1 st = 6.350293 kg
Need the other direction? Kilograms to Stones.
How to convert Stones to Kilograms
The stone is 14 pounds, used mainly in the UK and Ireland for body weight. The kilogram is the SI base unit of mass; since 2019 it is defined by the Planck constant.
To convert Stones to Kilograms, multiply the value in st by 6.350293. For example, 10 st × 6.350293 = 63.502932 kg. This works because the ratio between the two units is constant for every value in weight.
Worked examples
| st | kg |
|---|---|
| 1 st | 6.350293 kg |
| 2.5 st | 15.875733 kg |
| 5 st | 31.751466 kg |
| 10 st | 63.502932 kg |
| 25 st | 158.757329 kg |
| 50 st | 317.514659 kg |
| 100 st | 635.029318 kg |
Reverse conversion
| kg | st |
|---|---|
| 1 kg | 0.15747304 st |
| 5 kg | 0.78736522 st |
| 10 kg | 1.57473 st |
| 25 kg | 3.936826 st |
| 50 kg | 7.873652 st |
| 100 kg | 15.747304 st |
When this conversion is useful
This is the calculation you need when you are comparing body weight, shipping weight or a recipe across metric and imperial units. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 st is 6,350.29 kg.
Is the conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
st to kg conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| Stones (st) | Kilograms (kg) |
|---|---|
| 1 st | 6.350293 kg |
| 2 st | 12.700586 kg |
| 3 st | 19.05088 kg |
| 4 st | 25.401173 kg |
| 5 st | 31.751466 kg |
| 6 st | 38.101759 kg |
| 7 st | 44.452052 kg |
| 8 st | 50.802345 kg |
| 9 st | 57.152639 kg |
| 10 st | 63.502932 kg |
| 11 st | 69.853225 kg |
| 12 st | 76.203518 kg |
| 13 st | 82.553811 kg |
| 14 st | 88.904105 kg |
| 15 st | 95.254398 kg |
| 16 st | 101.604691 kg |
| 17 st | 107.954984 kg |
| 18 st | 114.305277 kg |
| 19 st | 120.65557 kg |
| 20 st | 127.005864 kg |
| 21 st | 133.356157 kg |
| 22 st | 139.70645 kg |
| 23 st | 146.056743 kg |
| 24 st | 152.407036 kg |
| 25 st | 158.757329 kg |
| 26 st | 165.107623 kg |
| 27 st | 171.457916 kg |
| 28 st | 177.808209 kg |
| 29 st | 184.158502 kg |
| 30 st | 190.508795 kg |
| 31 st | 196.859089 kg |
| 32 st | 203.209382 kg |
| 33 st | 209.559675 kg |
| 34 st | 215.909968 kg |
| 35 st | 222.260261 kg |
| 36 st | 228.610554 kg |
| 37 st | 234.960848 kg |
| 38 st | 241.311141 kg |
| 39 st | 247.661434 kg |
| 40 st | 254.011727 kg |
| 41 st | 260.36202 kg |
| 42 st | 266.712314 kg |
| 43 st | 273.062607 kg |
| 44 st | 279.4129 kg |
| 45 st | 285.763193 kg |
| 46 st | 292.113486 kg |
| 47 st | 298.463779 kg |
| 48 st | 304.814073 kg |
| 49 st | 311.164366 kg |
| 50 st | 317.514659 kg |
| 60 st | 381.017591 kg |
| 70 st | 444.520523 kg |
| 80 st | 508.023454 kg |
| 90 st | 571.526386 kg |
| 100 st | 635.029318 kg |
Frequently asked questions
How many Kilograms are in 1 Stones?
1 st equals 6.350293 kg.
How do I convert Stones to Kilograms?
Multiply the st value by 6.350293. Example: 25 st = 158.757329 kg.
What is 2.5 st in kg?
2.5 st = 15.875733 kg.
Is the st to kg conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.