Stone To Kg Converter
Convert body weight from stone to kilograms (kg). An essential tool for bridging UK and international weight standards.
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Bridging the Gap: Converting Body Weight from Stone to Kilograms
Measuring body weight can be confusing, especially when communicating with people from different parts of the world. While the kilogram (kg) is the standard unit of mass in the International System of Units (SI), the "stone" remains a common unit for body weight in the United Kingdom, Ireland, and some Commonwealth countries. Our Stone to kg Converter is the perfect tool to bridge this gap, providing quick and accurate conversions.
What is a Stone?
The stone is an imperial unit of mass equal to 14 pounds (lbs). It was historically used in trade for agricultural commodities across Europe. While its use has largely been replaced by the metric system, it has persisted in the UK and Ireland as the primary unit for human body weight.
The Conversion Explained
To convert from stone to kilograms, we need a two-step process based on internationally agreed-upon definitions:
- First, we define a stone in terms of pounds:
1 stone = 14 pounds
- Next, we use the exact conversion factor for pounds to kilograms:
1 pound = 0.45359237 kilograms
By combining these, we can find the conversion factor for stone to kilograms:
1 stone = 14 lbs × 0.45359237 kg/lb = 6.35029318 kg
For most practical purposes, this is rounded to 6.35029.
The Formulas:
- To convert stone to kg: Multiply the weight in stone by 6.35029.
kg = stone × 6.35029 - To convert kg to stone: Divide the weight in kilograms by 6.35029.
stone = kg / 6.35029
Example Conversions
- A person weighing 12 stone would convert to kilograms as:
12 stone × 6.35029 = 76.2 kg - A person weighing 70 kg would convert to stone as:
70 kg / 6.35029 ≈ 11.02 stone
Quick Reference Conversion Table
| Stone | Kilograms (approx.) |
|---|---|
| 8 stone | 50.8 kg |
| 10 stone | 63.5 kg |
| 12 stone | 76.2 kg |
| 14 stone | 88.9 kg |
| 16 stone | 101.6 kg |
Frequently Asked Questions (FAQ)
- Q: Why is body weight measured in stone?
- A: The use of stone for body weight is a historical tradition that has persisted in the UK and Ireland, similar to how the United States continues to use feet and inches for height. It's a cultural convention that remains popular despite the official adoption of the metric system.
- Q: How do I handle partial stone values, like "10 stone 7 pounds"?
- A: To convert a weight like 10 stone 7 pounds to kg, you first convert the entire value to pounds (10 × 14 + 7 = 147 lbs) and then convert the pounds to kilograms (147 lbs × 0.45359237 ≈ 66.7 kg). Alternatively, you can convert the stone part to kg (10 × 6.35029) and the pounds part to kg (7 × 0.45359237) and add them together.
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