Stone to Kg Converter & Popular Conversions
| Stone » Kilograms | Stone » Kilograms | Stone » Kilograms | Stone » Kilograms | Stone » Kilograms | Stone » Kilograms |
|---|---|---|---|---|---|
| 8 » 50.80 | 8.5 » 53.98 | 9 » 57.15 | 10 » 63.50 | 11 » 69.85 | 12 » 76.20 |
| 13 » 82.55 | 14 » 88.90 | 15 » 95.25 | 16 » 101.60 | 18 » 114.30 | 20 » 127.00 |
Many people search for conversions like 10 stone to kg, 12 stone to kg for fitness, or 15 stone in kg for health records. If you need a different value, you’ll find it in the complete chart below.
Stone to Kg Conversion Chart
From 1 to 500 stone, this chart helps you quickly find conversions like 4 stone in kg, 12 stone to kg, and 14 stone to kg.
| Stone » Kilograms | Stone » Kilograms | Stone » Kilograms | Stone » Kilograms | Stone » Kilograms | Stone » Kilograms |
|---|
Don’t see your number in the table? Multiply the stone value by 6.35029, or use the stone to kg converter above to get the result in seconds.
Stone to KG Converter (2026)
Many people in the UK and Ireland need to convert stone to kg because stone is still commonly used for body weight, while kilograms are used in most other countries. One stone equals 6.35029 kilograms, and this guide has everything you need to make the conversion.
Quick Answer
1 stone equals 6.35029318 kg (commonly rounded to 6.35029) according to the NIST conversion factor. To convert stones to kg, just multiply your stone value by 6.35029.
How Many Kilograms Are in One Stone?
One stone equals 6.35029 kilograms. Most people round that to 6.35 kg, and that’s close enough for everyday use.
This number never changes. A stone always weighs the same amount, so once you know this figure, you can convert any value of stone into kg without a second thought.
Stone still appears in everyday health and fitness settings. It may come up in a doctor’s appointment or when discussing athletes and weight classes in sports.
How to Convert Stone to Kg?
Converting stone to kilograms is simple. Just multiply the number of stones by 6.35029.
Stone to Kg Conversion Formula
Kilograms = Stones × 6.35029
Worked Example Formula
11 × 6.35029 = 69.85 kg
So, 11 stone is equal to about 69.85 kilograms. You can use the same formula for any stone value, or check the conversion chart below for a faster answer. You can also enter your value into the stone to kg converter above and get the result instantly.
How to Convert Stone and Pounds to Kg
In the UK, body weight is often written as a combination of stone and pounds, such as 13 st 5 lb or 12 st 8 lb. To convert this format into kilograms, you’ll need to convert both parts separately and then add the results together.
Step 1: Convert the Stone to Kilograms
Multiply the number of stones by 6.35029. like
- 13 stone × 6.35029 = 82.550 kg
Step 2: Convert the Pounds to Kilograms
Multiply the number of pounds by 0.453592.
- 5 pounds × 0.453592 = 2.27 kg
Step 3: Add the Two Values
When you’ve converted both the stone and the pounds, simply add the two numbers together to get the weight in kilograms.
- 82.55 + 2.27 = 84.82 kg
Convert Kg to Stone
Converting kilograms back to stone is just as easy. Divide the number of kilograms by 6.35029 to find the weight in stone.
Formula
Stone = Kilograms ÷ 6.35029
Worked Example
For example, here is the conversion for 80 kg.
80 ÷ 6.35029 = 12.60 stone
After dividing by 6.35029, 80 kg comes to around 12.6 stone.
For a result in stone and pounds, convert the decimal into pounds or use the kg to stone converter above.
Why Are My Results Different on Different Calculators?
It’s normal to see small differences between calculators when converting stone to kilograms. In most cases, the only reason is rounding.
Not every calculator follows the same method. Some uses a five-decimal conversion value of 6.35029 kg, while others round it first. Others convert stone into pounds before calculating kilograms, and that extra step can lead to minor differences.
These small differences don’t usually matter in daily life. For medical or official use, choose a calculator that uses the full 6.35029318 conversion value instead of a rounded figure.
When You'll Need to Convert Stone to Kg
Fitness Apps & Smart Scales
Most fitness apps and smart scales default to kilograms, even for UK users. You’ll need to convert before logging a target weight or syncing a connected scale.
Family Weight Records & Genealogy
Older UK medical records or a remembered family weight (“she was 9 stone”) are often in stone. Converting to kg makes them usable with modern tools and records.
International Online Shopping & Shipping
Overseas retailers and shipping calculators list weight-based costs in kilograms. Converting stone to kg first avoids surprise charges at checkout.
Frequently Asked Questions
How much is 1 stone in kg?
One stone equals 6.35029 kg, or about 6.35 kg once you round it. That figure stays fixed no matter what, so it’s worth keeping in mind for quick mental math.
How much is 8.5 stone in kg?
8.5 stone equals 53.98 kilograms. To work it out yourself, multiply 8.5 by 6.35029.
What is the formula for converting stone to kg?
The formula is Kilograms = Stones × 6.35029. Multiply the number of stones by 6.35029 to get the weight in kilograms.
How do you convert stone to kilograms?
Just multiply the stone figure by 6.35029, and you can convert any number, no matter how big or small.
Is there a quick way to estimate stone to kg?
Yes. Simply multiply the stone value by 6.35 to get a close estimate in kilograms. For more precise calculations, use 6.35029.
Why does the UK still use stone for weight?
Stone has simply been the go-to unit for body weight for a long time. The metric system may be the official standard, but stone is still what most people are comfortable using.