Convert kilograms to stone easily.
1 kg ÷ 6.35029 = 0.15747 st
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Ever stepped on a scale abroad and gotten confused by those stone numbers? Or maybe you're following a British fitness plan that uses this medieval-sounding unit? Don't worry – converting between kilograms and stone isn't as old-school as it seems. In fact, it's something millions do daily while bridging metric and imperial systems. Let's break down why this conversion matters and how to master it.
Unit definitions
What is a kilogram (kg)?
- Description: The kilogram is the base unit of mass in teh International System of Units (SI)
- Symbol: kg
- Common uses: Used worldwide for science, commerce, and everyday weight measurements
- Definition: Since 2019, defined through the Planck constant rather than a physical object
What is a stone (st)?
- Description: An imperial unit primarily used in Britain and Ireland
- Symbol: st
- Common uses: Measuring body weight and dry goods historically
- Definition: 1 stone equals 14 pounds or exactly 6.35029 kilograms
Conversion formula
The magic number you need is 6.35029. To convert:
- Kilograms to stone: kg ÷ 6.35029 = st
- Stone to kilograms: st × 6.35029 = kg
Example calculations
- Converting 70kg to stone: 70 ÷ 6.35029 = 11.02st (or 11 stone if rounding down)
- Converting 10st to kg: 10 × 6.35029 = 63.50kg
Conversion tables
Kilograms to stone
| Kilograms | Stone |
|---|---|
| 50 | 7.87 |
| 60 | 9.45 |
| 70 | 11.02 |
| 80 | 12.60 |
| 90 | 14.17 |
| 100 | 15.75 |
Stone to kilograms
| Stone | Kilograms |
|---|---|
| 1 | 6.35 |
| 5 | 31.75 |
| 10 | 63.50 |
| 15 | 95.25 |
| 20 | 127.01 |
Historical background
The stone's history is literally set in stone – ancient civilizations used actual stones as weight standards. By the Middle Ages, British towns had their own "stone" weights ranging from 5 to 40 pounds! It wasn't until 1835 that the UK standardized it to 14 pounds. Meanwhile, the kilogram emerged from French Revolution-era measurements, originally based on a liter of water. Fun fact: The original kilogram prototype is kept under three glass bell jars near Paris.
Interesting facts?
- The UK legally requires metric units on food labels but still uses stone for personal weight in media
- Ireland officially switched to kilograms in 2005, but many still use stone conversationally
- 1 stone equals approximately 158 cheeseburgers (if each is 40g)
- Doctors worldwide use kilograms, making stone conversions crucial for international medical records
- The word "stone" comes from Old English "stān," meaning rock – no surprise there
FAQ
Stone remains popular in Britain as a legacy measurement system, though metric units are officially used. It's deeply ingrained in cultural references to personal weight.
Use the same formula (kg ÷ 6.35029), but most parents find grams or pounds more practical for infant weights.
Boxing occasionally uses stone in informal contexts, but professional fights are measured in kilograms or pounds globally.
No, 1 stone equals 14 pounds. It's specifically used for body weight in some countries, unlike ounces or tons.
For personal tracking, rounding to 1 decimal (e.g., 10.5st) is common. Medical contexts usually require precise kilograms.