Convert Stone to Kilograms
Stone (st) to Kilogram (kg) unit conversion — enter any value below to get an instant result, or use the table for common values.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
1 st = 6.3502932 kg
1 Stone = 6.3502932 Kilograms
1 Kilogram = 0.15747304 Stone
1 st in every supported unit
Conversion chart: Stone to Kilograms
Conversion table
| Stone (st) | Kilogram (kg) |
|---|---|
| 0.01 st | 0.063502932 kg |
| 0.1 st | 0.63502932 kg |
| 1 st | 6.3502932 kg |
| 2 st | 12.700586 kg |
| 3 st | 19.05088 kg |
| 5 st | 31.751466 kg |
| 10 st | 63.502932 kg |
| 20 st | 127.00586 kg |
| 50 st | 317.51466 kg |
| 100 st | 635.02932 kg |
| 1000 st | 6350.2932 kg |
Stone (st)
Definition: Equal to 14 pounds, or exactly 6.35029318 kilograms.
History: Originated in medieval England and Scotland from the practice of weighing goods, particularly wool, against a standardized stone; the value varied by region and commodity (wool, meat, cheese) until it was fixed by statute at 14 pounds in the 19th century.
Current use: Still the everyday unit for reporting adult body weight in the United Kingdom and Ireland (e.g. "12 stone 6"), though it has no official role in trade, which uses metric units.
Kilogram (kg)
Definition: The SI base unit of mass, equal to 1,000 grams; since 2019 defined by fixing the numerical value of the Planck constant rather than by a physical object.
History: Originally defined in 1799 by a platinum artifact called the Kilogramme des Archives, later replaced in 1889 by the International Prototype Kilogram — a platinum-iridium cylinder kept near Paris that served as the literal physical standard for over a century until the 2019 redefinition based on fundamental constants.
Current use: The universal base unit of mass in science, industry, and everyday commerce in virtually every country except the United States, which still uses pounds for most retail and personal contexts.
Supported Units
| Unit | Symbol | In Kilograms |
|---|---|---|
| Milligram | mg | 1E-06 kg |
| Gram | g | 0.001 kg |
| Kilogram | kg | 1 kg |
| Metric Ton | t | 1000 kg |
| Ounce | oz | 0.028349523 kg |
| Pound | lb | 0.45359237 kg |
| Stone | st | 6.3502932 kg |
| US Ton | tn | 907.18474 kg |
| Long Ton | long tn | 1016.0469 kg |
About These Parameters
- Value
- The number you want to convert, expressed in the "From" unit. Accepts decimals.
- From Unit
- The unit your input value is currently measured in.
- To Unit
- The unit you want the result converted into. Use the swap button to flip From and To instantly.
How Weight Conversion Works
The Formula
Every unit here is defined by a fixed multiplier relative to the kilogram. To convert a value from one unit to another:
result = value × (factor of "From" unit ÷ factor of "To" unit)
For Stone → Kilogram: multiply by 6.3502932. For example, 1 st × 6.3502932 = 6.3502932 kg.
Weight vs. Mass
Strictly speaking, mass measures the amount of matter in an object, while weight measures the force gravity exerts on that mass — an object's mass stays the same on the Moon, but its weight (in newtons) drops to about one-sixth of its Earth value. In everyday language and on this page, "weight" and "mass" are used interchangeably, as they are in commerce and daily life, because all the units here (kilogram, pound, ounce, and so on) are technically units of mass measured under standard Earth gravity.
Metric vs. Avoirdupois
The metric units on this page (milligram through metric ton) all scale by powers of ten, so converting between them is just moving a decimal point. The avoirdupois system (ounce, pound, stone, US ton, long ton) uses irregular multiples — 16 ounces to a pound, 14 pounds to a stone, 2,000 pounds to a US ton — inherited from centuries of English trade custom that predate the metric system.
Metric Tonne vs. US Ton vs. Long Ton
These three "ton" units are often confused but are meaningfully different: a metric ton (tonne) is exactly 1,000 kg (≈2,204.6 lb), a US or "short" ton is 2,000 lb (≈907.2 kg), and a British or "long" ton is 2,240 lb (≈1,016.0 kg). The metric tonne sits between the two — about 10% heavier than a US ton and about 1.6% lighter than a long ton — which makes it easy to misquote freight or cargo weights if the unit isn't specified explicitly.
Example
1 st equals 6.3502932 kg. For scale, that's about 0.09× the weight of an average adult (70 kg, or 11.023113 st).
Frequently Asked Questions
How many Kilograms are in 1 Stone?
1 Stone (st) equals exactly 6.3502932 Kilograms (kg).
What is the difference between a US ton and a metric ton?
A US (short) ton is 2,000 pounds (907.18 kg), while a metric ton (tonne) is exactly 1,000 kg (about 2,204.6 lb) — the metric ton is roughly 10% heavier, so the two should never be used interchangeably in shipping, trade, or engineering documents.
Why do the UK and Ireland measure body weight in stone?
Stone (14 lb) has been used informally for body weight in Britain and Ireland since the 19th century and remains common in everyday speech, medical settings, and sports reporting there, even though the UK officially uses the metric system for trade and most other measurements.
How accurate are these conversions?
Every conversion factor used here is the exact, internationally standardized value (e.g. 1 pound = exactly 0.45359237 kg, fixed by international agreement in 1959) — results are limited only by floating-point display precision, not by rounded conversion constants.