Stone to Kilograms Converter
Convert stone to kilograms, or kilograms to stone, with the exact factor shown.
What this tool does
To convert stone to kilograms, multiply by 6.35029. So 1 stone is 6.35 kg, 10 stone is 63.5 kg and 14 stone is 88.9 kg. To convert kilograms to stone, divide by 6.35029; one stone is also exactly 14 pounds. Enter a value above for the exact result.
Converts between stone, kilograms, pounds, grams using exact factors, and shows the factor used.
Updates as you type, and the swap button reverses the direction.
How to use it
- Enter the value in stone, or press Swap units to start from kilograms.
- Pick another unit from the lists if you need a different one.
- Read the result and the factor beneath it.
- Press Copy to copy the result.
Why use this converter
Converts stone to kilograms (and kilograms to stone) with the exact factor of 6.35029318 kg per stone. Body weight in the UK and Ireland is traditionally given in stones and pounds, while health forms, scales and most of the world use kilograms. A converter avoids doing the 14-pound arithmetic by hand.
Why we built it
We built the stone to kg converter around the exact 6.35029318 factor, and included pounds for stones-and-pounds weights. Feed the result into the BMI calculator and the calorie calculator.
Who this tool is for
- People in the UK and Ireland filling forms that ask for kilograms
- Anyone using a BMI or calorie calculator
- Fitness trackers
When to use it
- Filling a form that asks for kilograms.
- Following a health or fitness plan written in kg.
- Comparing weights between countries.
- Using a calculator that needs kilograms, such as BMI.
How it works
One stone is exactly 14 pounds, and a pound is exactly 0.45359237 kg, so a stone is 6.35029318 kg. To convert stones and pounds, convert the stones, then add the pounds × 0.45359237.
| Stone | Kilograms |
|---|---|
| 1 st | 6.35029 kg |
| 8 st | 50.8023 kg |
| 10 st | 63.5029 kg |
| 12 st | 76.2035 kg |
| 14 st | 88.9041 kg |
| 20 st | 127.006 kg |
What you give it, and what you get back
| Item | Details |
|---|---|
| Value | A number in the "from" unit. Decimals and negative numbers are accepted. |
| From and To | Any of 4 units: Stone, Kilograms, Pounds, Grams. |
| Result | The converted value and the exact conversion factor. |
Issues you may run into
| What you see | Why it happens | What to do |
|---|---|---|
| Stones and pounds such as 11 st 4 lb give an odd result | The value is one number in one unit. | Convert 11 st, then add 4 lb ÷ 14 stone, or enter 158 lb with the pounds unit. |
| A US reader does not recognise stone | The stone is used mainly in the UK and Ireland. | Give the result in kg or lb. |
| Result is rounded | Display rounding only. | The factor is exact. |
Assumptions and limitations
- Results are shown with practical rounding; the calculation itself uses exact factors.
- It converts a number between units - it does not know what the quantity is.
Frequently asked questions
How many kg are in a stone?
One stone is exactly 6.35029318 kilograms, or 14 pounds.
How do I convert stone to kg?
Multiply the stone by 6.35029.
What is 10 stone in kg?
10 stone is about 63.5 kg.
How do I convert kg to stone and pounds?
Divide the kilograms by 6.35029 for stone. Multiply the leftover decimal by 14 for pounds.
How many pounds are in a stone?
There are exactly 14 pounds in a stone.
Is it free and private?
Yes. It runs in your browser.