Convert stone to kilograms with confidence.
1 st x 6.35029 = 6.35029 kg
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Ever stepped on a scale in London and seen "st" blinking back at you? If you’re used to kilograms, stone can feel like deciphering medieval measurements. But don’t worry – this quirky unit has a straightforward relationship with the metric system. Whether you’re tracking fitness goals, comparing international recipes, or just satisfying your curiosity, understanding stone-to-kilogram conversions is simpler than brewing a proper cuppa.
Unit definitions
What is a stone (st)?
- Description: A British imperial unit for measuring body weight
- Symbol: st
- Common uses: Personal weight in UK/Ireland, vintage weight records
- Definition: 1 stone = 14 pounds = 6.35029 kilograms
What is a kilogram (kg)?
- Description: The base metric unit for mass
- Symbol: kg
- Common uses: Global science, medicine, commerce
- Definition: Weight equal to 1 liter of water (roughly). Officially tied to the Planck constant since 2019.
Conversion formula
Stone to kg:
Kilograms = Stone × 6.35029
Kg to stone:
Stone = Kilograms ÷ 6.35029
Example calculations
- Your friend says they weigh 10 stone.
10 st × 6.35029 = 63.5029 kg → 63.50 kg (rounded) - A gym weight plate is 20 kg.
20 kg ÷ 6.35029 ≈ 3.149 st → 3.15 stone (rounded)
Conversion tables
Stone to kilograms
| Stone | Kilograms |
|---|---|
| 1 | 6.35 |
| 2 | 12.70 |
| 3 | 19.05 |
| 4 | 25.40 |
| 5 | 31.75 |
| 6 | 38.10 |
| 7 | 44.45 |
| 8 | 50.80 |
| 9 | 57.15 |
| 10 | 63.50 |
Kilograms to stone
| Kilograms | Stone |
|---|---|
| 10 | 1.57 |
| 20 | 3.15 |
| 30 | 4.72 |
| 40 | 6.30 |
| 50 | 7.87 |
| 60 | 9.45 |
| 70 | 11.02 |
| 80 | 12.60 |
| 90 | 14.17 |
| 100 | 15.75 |
Historical background
The stone’s origins trace back to ancient trading – merchants used actual stones as counterweights! By the 14th century, England standardized it to 14 pounds for wool trading. Fun fact: Local 'stones" varied wildly before then – some were 5 lbs, others 24 lbs. Imagine the market chaos!
Despite metrication, stone clung on in Britain. It’s the Goldilocks unit – pounds feel too small, kilograms too foreign. Even today, British weather reports give wind speeds in mph and rain in millimeters. Consistency? Nah, but it’s part of the charm.
Interesting facts?
- Boxing weights: British boxers like Tyson Fury weigh in using stone for media, but officially record in kg.
- Royal reference: Queen Elizabeth II’s corgis reportedly weighed about 1.5 stone each.
- Scandinavian twist: Sweden had its own "sten" until 1889 – equal to 13.3 lbs. Not confusing at all!
- Celebrity stone: Adele’s 7-stone weight loss made headlines globally, forcing every non-Brit to Google conversions.
- Fake it till you make it: 1 stone ≈ 6.35 kg. For quick estimates, use "6 times plus a bit extra."
FAQ
Stone is part of Britain's imperial system tradition, often used informally for body weight. It’s like how Americans use pounds – it’s just cultural habit!
Multiply the number of stone by 6.35029. For example, 8 stone × 6.35029 = 50.8023 kg. Or use our converter to skip teh math.
Yes! 1 stone equals exactly 6.35029318 kilograms. We round to 6.35029 for simplicity, but our tool uses full precision.
Most medical professionals use kilograms globally. Even in the UK, hospitals record patient weights in kg for consistency with international standards.
1 stone = 14 pounds. So if someone weighs 11 stone 5 lbs, that’s 159 lbs total. But kilograms simplify things – no fractions or double units!