Convert weight and mass units — kilograms, pounds, ounces, grams, tons, stones.
| Unit | Name | Value |
|---|---|---|
| kg | Kilogram | 6.35029 |
| g | Gram | 6350.29 |
| mg | Milligram | 6350290 |
| t | Metric Ton | 0.00635029 |
| lb | Pound | 14.000004 |
| oz | Ounce | 224.00007 |
The Stone (st) and the Kilogram (kg) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 st = 6.35029 kg
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Stone (st) | Kilogram (kg) | Real-world context |
|---|---|---|
| 1 st | 6.35029 kg | |
| 5 st | 31.75145 kg | |
| 10 st | 63.5029 kg | |
| 50 st | 317.5145 kg | |
| 100 st | 635.029 kg |
1 stone (st) equals exactly 6.35029 kilograms (kg). Use the formula: st × 6.35029 = kg.
To convert stone to kilograms, multiply your value in stone by 6.35029. For example, 5 st × 6.35029 = 31.75145 kg.
100 stone = 635.029 kilograms. Calculation: 100 × 6.35029 = 635.029.
To convert kilograms back to stone, divide by 6.35029 (or multiply by 0.15747312). Example: 10 kg ÷ 6.35029 = 1.5747312 st.
Yes. This converter uses the internationally recognised exact conversion factor: 1 st = 6.35029 kg. All calculations are performed in your browser with no rounding until display.
10 stone = 63.5029 kilograms. Simply multiply by 6.35029.
Converting stone to kilograms is commonly needed for everyday tasks like cooking recipes, body weight tracking, shopping internationally, or shipping parcels where one system uses st and another uses kg.
The stone (st) is a British imperial unit of mass equal to exactly 14 avoirdupois pounds or 6.35029318 kilograms. Used almost exclusively in the United Kingdom and Ireland for human body weight, it has no role in scientific, commercial, or international contexts. The stone is not an SI unit and was removed from official UK trade measurement in 1985, though it remains deeply embedded in everyday British culture.
The kilogram (kg) is the SI base unit of mass — one of seven fundamental units in the International System. Equal to exactly 1,000 grams, it is the foundation of weight measurement in science, medicine, engineering, and commerce worldwide. Uniquely among SI base units, the kilogram is named with a metric prefix ("kilo-" = 1,000).
One of the oldest English weight units, the stone was referenced as early as the 13th century. Historically its value varied by commodity (8 lb for meat, 12 lb for hemp, 14 lb for wool, 16 lb for glass). King Edward III standardised the wool stone at 14 pounds in 1350, which became the universal English standard. The Weights and Measures Act 1835 formally defined the stone as 14 lb. EU harmonisation abolished the stone for trade in 1985.
Interesting fact: The world record heaviest person weighed 635 kg — exactly 100 stone, illustrating how the stone unit provides digestible reference points for large body weights. British people typically express their weight as, for example, "11 stone 4 pounds."
Defined in 1795 by the French Revolutionary government as the mass of one cubic decimetre of distilled water at 4 °C. A platinum prototype (the Kilogramme des Archives) was created in 1799. From 1889 until 2019, the world's mass standard was the International Prototype Kilogram — a platinum-iridium cylinder stored in Sèvres, France. In 2019, the kilogram was redefined in terms of Planck's constant (h = 6.626 070 15 × 10⁻³⁴ J·s), eliminating the need for a physical artifact.
Interesting fact: The IPK and its official copies drifted apart by up to 50 micrograms over 130 years, motivating the 2019 redefinition. The kilogram is the only SI unit whose name starts with a prefix.