Why Convert Stones to Kilograms?
Converting between stones (st) and kilograms (kg) is one of the most common mass conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert st to kg saves time and prevents errors.
Mass conversions from st to kg are vital in culinary arts, logistics, and pharmaceutical industries. Professional chefs and home bakers rely on precise ingredient conversions to replicate international recipes — a slight variation in flour or leavening agents can ruin the texture of a dish. In global shipping, freight costs and vehicle load limits depend on accurate weight calculations to ensure safety and compliance with transport regulations. Furthermore, in healthcare and chemistry, dosage calculations must be exact; confusing mass units can lead to ineffective treatments or dangerous overdoses. Reliable mass conversion ensures consistency across borders and disciplines.
How to Convert Stones to Kilograms
To convert stones to kilograms, use the following formula:
kg = st × 6.35029318
Example: 1 st = 6.35029318 kg
For example, 5 st = 31.7514659 kg, 10 st = 63.5029318 kg, and 100 st = 635.029318 kg. For larger values, 1000 st = 6350.29318 kg. Conversely, 1 kg = 0.1574730444 st. Our calculator above performs this conversion instantly with full precision — no rounding errors.
Common Use Cases
- 10 stone (healthy weight benchmark UK): 10 st = 63.5029318 kg
- 12 stone (average UK male): 12 st = 76.20351816 kg
- 9 stone (petite adult weight): 9 st = 57.15263862 kg
Common Mistakes to Avoid
- Mass vs Weight: confusing mass (kg) with weight/force (Newtons or lbs-force).
- Ton variations: mixing up Short Ton (US), Long Ton (UK), and Metric Tonne.
- Ounce confusion: confusing Ounces (weight) with Fluid Ounces (volume).
Pro Tips
- Kitchen scales: Use the 'Tare' button to zero out container weight.
- Water weight: 1 Liter of water weighs exactly 1 kg (at 4°C). Useful benchmark.
- Conversion rule: To get kg from lbs, divide by 2.2 (approx halve it).
What is a Stone?
The stone (st) is a unit of mass in the Imperial system equal to 14 pounds or approximately 6.35 kilograms. It has been used in Britain and Ireland for centuries.
Stone is almost exclusively used in the United Kingdom and Ireland for measuring human body weight. It is rarely used in science or commerce today.
What is a Kilogram?
The kilogram (kg) is the base unit of mass in the International System of Units (SI). Originally defined by a platinum-iridium artifact, since 2019 it is defined by the Planck constant (h) set to 6.62607015×10⁻³⁴ J⋅s.
Kilograms are the global standard for measuring mass and weight in science, commerce, and daily life (body weight, groceries). Used nearly everywhere except the US.