About the Stone to KG
This stone to kg converter turns a weight in stones and pounds — the way body weight is usually given in the UK and Ireland — into kilograms. Enter the stones and any extra pounds (for example 12 st 7 lb) and you get the weight in kilograms, total pounds and grams, with the working shown.
It is useful when a doctor, gym or fitness app asks for kilograms but you know your weight in stones, when following a diet plan written in metric, or when comparing weights between UK and European or international sources.
A stone is exactly 14 pounds and a pound is exactly 0.45359237 kg, so one stone is 6.35029318 kg. The conversion is exact; only the displayed decimals are rounded.
With the default inputs, the kilograms is 69.85 kg. Change any value above to recalculate instantly.
How to use the stone to kg
- 1Enter the whole stones of the weight.
- 2Enter any extra pounds (leave at 0 if none).
- 3Read the weight in kilograms and total pounds.
- 4Use the chart for quick look-ups of common body weights.
Formula and method
First the weight is turned into pounds: each stone is exactly 14 lb, so 11 st 4 lb is 11 × 14 + 4 = 158 lb. Pounds are then multiplied by 0.45359237, the exact number of kilograms in an international avoirdupois pound.
Combining the two steps, one stone equals 14 × 0.45359237 = 6.35029318 kg. Grams are kilograms × 1000 and the decimal stone output is total pounds ÷ 14.
- st
- Stone = 14 pounds
- lb
- Pound = 0.45359237 kg
- kg
- Kilograms
Worked examples
11 stone
11 × 14 = 154 lb, and 154 × 0.45359237 = 69.85 kg — just under 70 kg.
12 stone 7 pounds
12 × 14 + 7 = 175 lb. Multiplying by 0.45359237 gives 79.38 kg. As a decimal that is 12.5 stone.
15 stone
15 × 6.35029318 = 95.25 kg, or about 95,254 grams.
Frequently asked questions
How many kg is 1 stone?+
One stone is exactly 6.35029318 kg, usually rounded to 6.35 kg. It equals 14 pounds.
How do I convert stones and pounds to kg?+
Multiply the stones by 14, add the extra pounds, then multiply the total by 0.4536. For 10 st 5 lb: 10 × 14 + 5 = 145 lb × 0.4536 ≈ 65.77 kg.
How many pounds are in a stone?+
A stone has exactly 14 pounds. So 13 stone is 182 lb and 9 st 10 lb is 136 lb.
Which countries use stones for weight?+
Stones are mainly used for body weight in the United Kingdom and Ireland. Most other countries use kilograms, and the US uses pounds.
What is 10 stone in kg?+
10 stone is 140 lb, which is 63.50 kg. 12 stone is 76.20 kg and 14 stone is 88.90 kg.