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Stone Conversion Table
This comprehensive stone conversion table shows how various units relate to stone, a traditional unit of mass. Use this reference for quick conversions between stone and other common mass units.
| Conversion | To Unit | Multiplier |
|---|---|---|
| Stone to kilograms | Kilograms | 6.35029 |
| Stone to grams | Grams | 6350.29 |
| Stone to milligrams | Milligrams | 6350290 |
| Stone to micrograms | Micrograms | 6350290000 |
| Stone to tonnes | Tonnes | 0.00635029 |
| Stone to carats | Carats | 31751.5 |
| Stone to pounds | Pounds | 14 |
| Stone to ounces | Ounces | 224 |
| Stone to grains | Grains | 98000 |
| Stone to hundredweight | Hundredweight | 0.14 |
| Stone to slugs | Slugs | 0.435133 |
This stone conversion reference table provides accurate conversion factors for both metric (SI) units and imperial units. All values are based on internationally recognized standards for maximum precision in scientific and engineering applications.
What is a Stone?
The stone (symbol: st) is a unit of mass equal to 14 pounds or approximately 6.35 kilograms. It is primarily used in the United Kingdom and Ireland for measuring human body weight. Despite not being part of the International System of Units (SI), stone remains a common unit in these regions for expressing personal weight.
The stone has historical roots in various European countries, where it was used in trade and commerce. In modern times, its use has become largely limited to measuring body weight in the UK and Ireland. Our stone conversion tool helps you easily convert between stone and other units. For example, 1 stone equals exactly 14 pounds or approximately 6.35 kilograms.
What is the SI of Stone?
The stone is not an SI unit. The base SI unit for mass is the kilogram (kg). However, stone can be converted to SI units:
- 1 Stone (st) = 6.35029 Kilograms (kg)
- 1 Stone (st) = 6350.29 Grams (g)
- 1 Stone (st) = 6350290 Milligrams (mg)
- 1 Stone (st) = 6350290000 Micrograms (µg)
What are Stones Used For?
Stones are used in a limited number of applications, primarily in the United Kingdom and Ireland for measuring human body weight. As a traditional unit that's not part of the SI system, stones are mainly relevant for mass conversion in specific cultural contexts:
Personal Weight Measurement
Body weight in the UK and Ireland is commonly expressed in stone and pounds. For example, a person might weigh 11 stone 4 pounds (approximately 72 kilograms).
Medical Records
Healthcare providers in the UK and Ireland often record patient weights in stone for familiarity and cultural relevance. For example, weight tracking during pregnancy might be recorded as 9 stone at the beginning and 12 stone at the end.
Fitness & Nutrition
Fitness centers and dietitians in the UK and Ireland may use stone for weight tracking and goal setting. For example, a fitness program might aim to help someone lose 2 stone (28 pounds or approximately 12.7 kilograms).
Historical & Cultural Context
Understanding historical documents or cultural references in the UK and Ireland may require familiarity with stone measurements. For example, historical records might mention a person's weight as 12 stone or a shipment of goods weighing 50 stone.
Etymology and History
The word "stone" comes from the Old English "stan" and has Germanic roots. The stone as a unit of measurement has varied significantly throughout history and across regions. In medieval England, the stone was used for various commodities with different weights, such as 5 stone for wool (approximately 35 pounds) and 8 stone for meat (approximately 56 pounds).
The modern definition of the stone as 14 pounds was standardized in the 14th century in England for the wool trade. This definition was later adopted for general use. The stone is not part of the modern SI system, and its use is now largely limited to measuring human body weight in the United Kingdom and Ireland. This cultural persistence reflects the deep-rooted traditions in these regions rather than any scientific standardization.
Frequently Asked Questions
Why is the stone used for measuring weight?
The stone became associated with human body weight in the United Kingdom and Ireland due to cultural and historical preferences. While not part of the SI system, it remains popular for expressing personal weight in these regions. Its use provides familiarity and cultural relevance for people in these countries when discussing body weight.
How accurate is the stone definition?
The stone is defined as exactly 14 pounds or approximately 6.35029 kilograms. This definition is precise and standardized, though it's not based on fundamental physical constants like SI units. For practical purposes, 1 stone = 14 pounds is sufficient for most applications, with the decimal value used for scientific calculations.
What countries use the stone unit?
The stone is primarily used in the United Kingdom and Ireland for measuring human body weight. Its use is largely absent from most other countries that have adopted the metric system. Some Commonwealth countries may occasionally reference it, but it's not an official unit of measurement in these places.
How do I convert stone to other units?
Use our stone conversion calculators above, or multiply by the appropriate conversion factor. For example, to convert stone to pounds, multiply by 14; to convert stone to kilograms, multiply by 6.35029. For detailed instructions on converting stone to kilograms, visit our st to kg converter. Our tool also handles conversions to imperial units like pounds and ounces with high precision.
What are common uses for stone conversion?
Stone conversion is most commonly used in the UK and Ireland for tracking personal weight, medical records, and fitness goals. It's also useful for understanding historical documents or cultural references in these regions. Whether calculating weight loss goals or converting historical measurements, our stone converter tool simplifies these tasks.
How does stone conversion differ from other mass units?
The stone is unique in its cultural specificity to the UK and Ireland for body weight measurement. Unlike SI units like kilograms, which have universal scientific application, the stone is primarily a traditional unit. This cultural limitation makes stone conversion less common globally compared to conversions involving kilograms or pounds.
Can I convert very small or very large measurements in stone?
Yes, our stone converter handles both smaller and larger measurements with precision. For very small weights, you might convert milligrams to stone (1 mg = 1.57473e-7 st). For larger weights, convert stone to tonnes (1 t = 157.473 st). Our smart rounding feature ensures readable results for all scales.
Is your stone conversion tool free to use?
Yes, our stone conversion calculator is completely free with no registration required. Simply enter your value, select your target unit, and get instant, accurate results. We believe precise measurement conversion should be accessible to everyone, from individuals tracking their fitness goals to professionals working with historical documents.