How to Convert Stone to KG — The Complete Guide
Whether you’re visiting a doctor, using a fitness app or comparing your weight with someone from a different country, you’ll often need to convert between stone and kilograms. The UK uses stone for body weight while most of the world uses kilograms — making this one of the most common weight conversions people need. This guide explains exactly how to convert stone to kg and back again, with tables, examples and a free calculator.
How Many KG is One Stone?
One stone is equal to 6.35029 kilograms. This is the exact conversion factor used by the International System of Units. For everyday purposes 6.35 kg per stone is accurate enough for most calculations.
Stone to KG Conversion Table
Use this table to quickly find the kilogram equivalent of common stone weights:
| Stone | Stone & Pounds | Kilograms (kg) | Pounds (lbs) |
|---|---|---|---|
| 7 stone | 7st 0lb | 44.45 kg | 98 lbs |
| 8 stone | 8st 0lb | 50.80 kg | 112 lbs |
| 9 stone | 9st 0lb | 57.15 kg | 126 lbs |
| 10 stone | 10st 0lb | 63.50 kg | 140 lbs |
| 11 stone | 11st 0lb | 69.85 kg | 154 lbs |
| 11 stone 7 | 11st 7lb | 73.03 kg | 161 lbs |
| 12 stone | 12st 0lb | 76.20 kg | 168 lbs |
| 13 stone | 13st 0lb | 82.55 kg | 182 lbs |
| 14 stone | 14st 0lb | 88.90 kg | 196 lbs |
| 15 stone | 15st 0lb | 95.25 kg | 210 lbs |
| 16 stone | 16st 0lb | 101.60 kg | 224 lbs |
How to Convert Stone and Pounds to KG
Most people describe their weight in stone AND pounds — for example 11 stone 7 pounds rather than just whole stone. To convert stone and pounds to kg you need two steps:
How to Convert KG to Stone
To convert kilograms back to stone, divide the number of kilograms by 6.35029 to get the total stone. The decimal part is then multiplied by 14 to get the remaining pounds.
KG to Stone Conversion Table
| Kilograms (kg) | Stone & Pounds | Total Pounds |
|---|---|---|
| 50 kg | 7st 12lb | 110 lbs |
| 55 kg | 8st 9lb | 121 lbs |
| 60 kg | 9st 6lb | 132 lbs |
| 65 kg | 10st 3lb | 143 lbs |
| 70 kg | 11st 0lb | 154 lbs |
| 75 kg | 11st 11lb | 165 lbs |
| 80 kg | 12st 8lb | 176 lbs |
| 85 kg | 13st 5lb | 187 lbs |
| 90 kg | 14st 2lb | 198 lbs |
| 100 kg | 15st 10lb | 220 lbs |
Why Does the UK Use Stone?
The stone is a unit of weight that has been used in Britain since the medieval period. It was officially standardised in England in 1389 when Parliament defined the stone of wool as 14 pounds. Over centuries it became the standard unit for measuring body weight throughout the British Isles.
Despite metrication in the 1970s and 80s, stone remained deeply embedded in everyday British life. The NHS officially uses kilograms for medical records but most British people still instinctively think of their body weight in stone and pounds. This cultural attachment means stone will likely remain in common use for body weight in the UK for the foreseeable future.
Outside the UK and Ireland, stone is almost never used. The United States uses pounds exclusively while the rest of the world uses kilograms — which is why conversion is so frequently needed.
Stone, KG and Pounds — How They Relate
| Unit | Equivalent in KG | Equivalent in Pounds |
|---|---|---|
| 1 stone | 6.35029 kg | 14 pounds |
| 1 kilogram | 1 kg | 2.20462 pounds |
| 1 pound | 0.453592 kg | 1 pound |
Convert Stone to KG Instantly
Rather than calculating by hand use the free CalcNest Stone to KG Calculator — enter your weight in stone and pounds and get the instant result in kilograms, total pounds and grams. The calculator also works in reverse — enter kilograms to get stone and pounds.
Frequently Asked Questions
How many kg is 1 stone?
1 stone is equal to 6.35029 kilograms — approximately 6.35 kg.
How many kg is 10 stone?
10 stone is equal to 63.50 kilograms.
How many kg is 11 stone?
11 stone is equal to 69.85 kilograms.
How many kg is 12 stone?
12 stone is equal to 76.20 kilograms.
How many kg is 13 stone?
13 stone is equal to 82.55 kilograms.
How many kg is 14 stone?
14 stone is equal to 88.90 kilograms.
How many kg is 11 stone 7?
11 stone 7 pounds is equal to 73.03 kilograms.
How many pounds are in a stone?
There are exactly 14 pounds in 1 stone.
Which countries use stone?
Stone is used almost exclusively in the United Kingdom and Ireland. The United States uses pounds and the rest of the world uses kilograms.