Stone to Kilogram Converter
Quick answer
To convert Stones to Kilograms, multiply by 6.35029318 (or divide by 0.1574730444). Therefore, 1 Stone (st) equals 6.35029318 Kilograms (kg).
Formula: kg = st × 6.35029318. Worked example: 10 st = 63.502932 kg.
Convert Stone (st) to Kilogram (kg) online with our free unit converter. In mass, 1 st = 6.350293 kg. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Stone to Kilogram
- Step 1 — start with the formula. kg = st × 6.35029318
- Step 2 — substitute your figure. 10 st × 6.35029318
- Step 3 — read the result. 10 st = 63.502932 kg
- Step 4 — check it in reverse. st = kg × 0.1574730444 returns 10 st, which matches the figure you started with.
Mass Converter
26 units available
1 st = 6.350293 kg
Formula:
kg = st × 6.35029318With your value: 1 st = 6.35029318 kg
How big is that?
Everyday references on a logarithmic scale, all expressed in stone so you can sanity-check the result.
Other Stone to Kilogram conversions
Stone to Kilogram Conversion Table
| Stone (st) | Kilogram (kg) |
|---|---|
| 0.5 | 3.175147 |
| 1 | 6.350293 |
| 2 | 12.700586 |
| 5 | 31.751466 |
| 10 | 63.502932 |
| 15 | 95.254398 |
| 20 | 127.005864 |
| 25 | 158.75733 |
| 50 | 317.514659 |
| 100 | 635.029318 |
| 250 | 1,587.573295 |
| 500 | 3,175.14659 |
| 1000 | 6,350.29318 |
Kilogram to Stone Conversion Table
| Kilogram (kg) | Stone (st) |
|---|---|
| 0.5 | 0.078737 |
| 1 | 0.157473 |
| 2 | 0.314946 |
| 5 | 0.787365 |
| 10 | 1.57473 |
| 15 | 2.362096 |
| 20 | 3.149461 |
| 25 | 3.936826 |
| 50 | 7.873652 |
| 100 | 15.747304 |
| 250 | 39.368261 |
| 500 | 78.736522 |
| 1000 | 157.473044 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Stone (st)
Mass
Traceable to the kilogram, defined by fixing the Planck constant at 6.626 070 15 × 10⁻³⁴ J·s. Avoirdupois masses derive from the 1959 international pound (0.453 592 37 kg exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Kilogram (kg)
Mass
The kilogram is defined by taking the Planck constant to be exactly 6.626 070 15 × 10⁻³⁴ J·s.
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Standards and context behind Stone to Kilogram
- Weights and Measures Act 1835
- Standardised the stone at 14 pounds in the UK.
- NHS practice
- UK clinical records commonly show both stones/pounds and kilograms, which is what drives this conversion.
How to Convert Stone to Kilogram
To convert from Stone (st) to Kilogram (kg), multiply the value by 6.35029318.
Formula: kg = st × 6.35029318
Reverse: st = kg × 0.1574730444
Step-by-Step Example
- Start with your value in Stone. For example: 5 st
- Multiply by the conversion factor: 5 x 6.35029318
- The result is: 31.751466 kg
Stone and Kilogram Relationship
This conversion bridges the US Customary / Imperial and Metric (SI) measurement systems, commonly required when translating scientific data, international engineering specifications, or trade standards. Since 1 Stone equals approximately 6.3503 Kilograms, the Stone represents a larger unit interval than the Kilogram. Understanding the relationship between Stone and Kilogram is essential for accurate calculations in physics, engineering, commerce, and daily applications.
About Stone
The stone equals 14 pounds or about 6.35 kg. It is primarily used in the UK and Ireland for expressing body weight.
Fun Fact: The stone varied in weight depending on the commodity being weighed until it was standardized at 14 pounds in 1835.
Common uses of Stone: body weight (UK), agriculture.
About Kilogram
The kilogram is the base unit of mass in the SI system. Since 2019, it is defined by the Planck constant rather than a physical artifact.
Fun Fact: Until 2019, the kilogram was defined by a platinum-iridium cylinder kept in Paris, called "Le Grand K."
Common uses of Kilogram: body weight, cooking, shipping.
Frequently Asked Questions
- How many Kilograms are in 1 Stone?
- There are exactly 6.35029318 Kilograms in 1 Stone. This means the conversion factor from Stone to Kilogram is 6.35029318.
- What is the formula to convert Stone to Kilogram?
- The formula to convert Stone to Kilogram is: kg = st × 6.35029318. For example, to convert 10 Stones to Kilograms, you would multiply 10 by 6.35029318.
- What is a Stone?
- The stone equals 14 pounds or about 6.35 kg. It is primarily used in the UK and Ireland for expressing body weight.
- What is a Kilogram?
- The kilogram is the base unit of mass in the SI system. Since 2019, it is defined by the Planck constant rather than a physical artifact.
- What are the common uses of Stone?
- The Stone is commonly used in body weight (UK), agriculture.
- How many kilograms is 10 stone?
- 10 stone is 63.5029 kg (10 × 14 lb × 0.45359237).
Related Mass Conversions
Cite this page
UnitConvertLab. (2026). Stone to Kilogram converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/stone-to-kilogram