Enter a weight in stone and pounds, the way it is said in the UK and Ireland, and get total pounds and kilograms. Switch to pounds or kilograms to turn them back into stone.
1 stone = 14 lb = 6.35029318 kg. Runs in your browser. Nothing you type is sent anywhere.
This stone to lbs converter is for anyone moving between UK body weight in stone, American pounds and metric kilograms, from gym goers and patients to people filling in a form abroad. Type stone and pounds together, as in 11 st 4 lb, and it shows the total in pounds, kilograms and decimal stone.
How Many Pounds Are in a Stone?
One stone is exactly 14 pounds, so to convert stone to lbs you multiply the stone by 14 and add any extra pounds. For example, 11 stone 4 pounds is 11 × 14 + 4 = 158 lb, which is 71.67 kg. One stone equals 6.35029318 kg.
What Is the Formula for Stone to lbs?
The formula is pounds = stone × 14 + extra pounds, because the stone is defined as exactly 14 avoirdupois pounds.
kg = lb × 0.45359237
stone = lb ÷ 14 (whole part), leftover lb = lb − (whole stone × 14)
The stone (symbol st) is an old British unit of weight set at 14 pounds in UK law. The avoirdupois pound (lb) is the everyday pound, fixed at exactly 0.45359237 kilogram since 1959. That makes one stone exactly 6.35029318 kg. The UK Weights and Measures Act 1985 still lists the stone, although trade weights must be in metric units.
Why Do People in the UK Weigh Themselves in Stone?
People in the UK and Ireland use stone for body weight out of habit, and many bathroom scales still show stone and pounds alongside kilograms. Doctors, the NHS and gyms record weight in kilograms, so a quick conversion is often needed. To check what a weight means for your health, enter the kilograms into the BMI calculator, which works out body mass index from weight and height. For a plain pounds and kilograms switch, the kg to lbs converter is faster. Weight alone does not tell you whether you are healthy, so talk to a doctor before making big changes.
Stone to lbs and kg Table
Values from this tool:
| Stone | Pounds | Kilograms |
|---|---|---|
| 6 st | 84 lb | 38.1 kg |
| 7 st | 98 lb | 44.45 kg |
| 8 st | 112 lb | 50.8 kg |
| 9 st | 126 lb | 57.15 kg |
| 10 st | 140 lb | 63.5 kg |
| 11 st | 154 lb | 69.85 kg |
| 12 st | 168 lb | 76.2 kg |
| 13 st | 182 lb | 82.55 kg |
| 14 st | 196 lb | 88.9 kg |
| 15 st | 210 lb | 95.25 kg |
| 16 st | 224 lb | 101.6 kg |
| 18 st | 252 lb | 114.31 kg |
| 20 st | 280 lb | 127.01 kg |
How Do You Convert Pounds Back to Stone?
Divide the pounds by 14: the whole number is the stone and the remainder is the leftover pounds. For 176 lb, 176 ÷ 14 = 12 remainder 8, so it is 12 st 8 lb. The tool does this for you when you pick Pounds or Kilograms.
Worked Example
A UK patient says she weighs 11 stone 4 pounds and the clinic form asks for kilograms. With Stone + pounds selected, type 11 and 4: the tool shows 158 lb, 71.67 kg and 11.29 decimal stone. Her friend in Germany weighs 80 kg; pick Kilograms and type 80 to get 12 st 8.4 lb, or 176.37 lb.
How Do You Use the Stone to lbs Converter?
Choose what you have
Pick Stone + pounds, Pounds or Kilograms depending on your starting weight.
Type the weight
Enter stone and pounds in their own boxes, or a single pounds or kilograms value.
Read the main result
The big number is total pounds, or stone and pounds when converting back.
Check every unit
The boxes show stone and pounds, pounds, kilograms and decimal stone together.
Frequently Asked Questions
How many pounds is 10 stone?
10 stone is exactly 140 pounds, because 10 × 14 = 140. In metric units that is 63.5 kilograms. 10 stone 7 lb, often called ten and a half stone, is 147 pounds.
How many kg is 1 stone?
One stone is exactly 6.35029318 kg, which most people round to 6.35 kg. It comes from 14 pounds × 0.45359237 kg per pound. Two stone is about 12.7 kg.
What is 12 stone in pounds and kg?
12 stone is 168 pounds and 76.2 kilograms. Multiply 12 by 14 to get 168 lb, then multiply 168 by 0.45359237 to get 76.2 kg, rounded to two decimal places.
How many stone is 100 kg?
100 kg is about 15 stone 10.5 pounds. 100 kg divided by 0.45359237 is 220.46 lb, and 220.46 ÷ 14 is 15 with 10.46 lb left over. In decimal stone that is 15.75 st.
Is 11.5 stone the same as 11 stone 5 pounds?
No. 11.5 stone is 11 stone 7 pounds, because half a stone is 7 pounds. 11 stone 5 pounds is about 11.36 stone. Type stone and pounds in separate boxes to avoid this mix up.
Do other countries use stone for weight?
Stone is mainly used for body weight in the UK and Ireland. The United States uses pounds, while most other countries, including Australia and Canada, officially use kilograms. Medical records in the UK also use kilograms.
Sources and Further Reading
- UK Weights and Measures Act 1985, Schedule 1 (stone = 14 pounds)
- NIST Guide to the SI, Appendix B.9: pound = 0.45359237 kg
- Stone (unit): history and use for body weight
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Last reviewed: October 2026