Stones (st) to Kilograms (kg) conversion

Stones to Kilograms conversion table

Stones (st)Kilograms (kg)
00
16.35029318
212.70058636
319.05087954
425.40117272
531.7514659
638.10175908
744.45205226
850.80234544
957.15263862
1063.5029318
20127.0058636
30190.5087954
40254.0117272
50317.514659
60381.0175908
70444.5205226
80508.0234544
90571.5263862
100635.029318
10006350.29318

How to convert stones to kilograms?

Converting between stones (st) and kilograms (kg) involves a straightforward application of a conversion factor, as both are units of mass. This section explains the conversion process, provides examples, and touches upon the historical context.

Understanding the Conversion

The key to converting between stones and kilograms lies in knowing the exact relationship between the two units. One stone is defined as exactly 14 pounds, and a pound is defined as exactly 0.45359237 kilograms.

Therefore, the conversion factor is:

1 stone=6.35029 kilograms1 \text{ stone} = 6.35029 \text{ kilograms}

Converting Stones to Kilograms

To convert stones to kilograms, multiply the number of stones by the conversion factor 6.35029.

Formula:

Kilograms=Stones×6.35029\text{Kilograms} = \text{Stones} \times 6.35029

Example:

To convert 1 stone to kilograms:

1 stone×6.35029=6.35029 kg1 \text{ stone} \times 6.35029 = 6.35029 \text{ kg}

Converting Kilograms to Stones

To convert kilograms to stones, divide the number of kilograms by the conversion factor 6.35029.

Formula:

Stones=Kilograms6.35029\text{Stones} = \frac{\text{Kilograms}}{6.35029}

Example:

To convert 1 kilogram to stones:

1 kg6.35029=0.157473 st\frac{1 \text{ kg}}{6.35029} = 0.157473 \text{ st}

Historical Context and Usage

The stone as a unit of weight has a long history, particularly in Britain and Ireland. It was commonly used to measure agricultural products, such as wool, and human body weight. Although largely replaced by the metric system for trade purposes in many countries, it remains a common unit for expressing human weight in the UK. For more details on the history of the stone, you can refer to sources like Wikipedia's article on the Stone (unit).

Real-World Examples

Besides body weight, here are some examples where stones and kilograms might be used:

  1. Shipping and Logistics: While metric tons are more common for very large shipments, understanding the stone equivalent can be useful when dealing with older documentation or specific regional practices.
  2. Agriculture: Historically, crops and livestock were often measured in stones. While modern agriculture primarily uses kilograms, some farmers might still use stones as a familiar reference point.
  3. Medical Field: In countries where the stone is still used for body weight, medical professionals need to be able to convert between stones and kilograms for international collaboration and research.

No Base 10 vs. Base 2 Difference

It's important to note that the conversion between stones and kilograms is based on fixed definitions and doesn't involve binary (base 2) or decimal (base 10) systems. These number systems are relevant for digital data storage and transfer rates, not for converting physical units of mass.

See below section for step by step unit conversion with formulas and explanations. Please refer to the table below for a list of all the Kilograms to other unit conversions.

What is stones?

What is Stones?

Stones (abbreviated as "st") are a unit of mass primarily used in the United Kingdom and Ireland for measuring human body weight. One stone is equivalent to 14 pounds (lbs) or approximately 6.35 kilograms (kg). While officially deprecated for most purposes, it remains common in everyday conversation for expressing weight.

Historical Context and Formation

  • Origin: The term "stone" originates from the practice of using stones as weights for measurement, a practice dating back to ancient times. The specific weight of a "stone" varied considerably across different regions and commodities for centuries.
  • Standardization: The standardization of the stone to 14 pounds was formalized in the UK Weights and Measures Act of 1835. This act helped establish uniformity in trade and measurement.
  • Why 14 pounds? The origin of 14 lbs is debated, some suggest it was a convenient amount for a man to carry while others trace it back to Roman times.

Mathematical Relationship

The relationship between stones, pounds, and kilograms can be expressed as follows:

  • 1 stone (st) = 14 pounds (lbs)
  • 1 pound (lb) ≈ 0.0714286 stones (st)
  • 1 stone (st) ≈ 6.35029 kilograms (kg)
  • 1 kilogram (kg) ≈ 0.157473 stones (st)

Conversion formulas:

  • To convert pounds to stones:

    Stones=Pounds14\text{Stones} = \frac{\text{Pounds}}{14}

  • To convert kilograms to stones:

    Stones=Kilograms6.35029\text{Stones} = \frac{\text{Kilograms}}{6.35029}

Usage and Examples

The primary application of stones is for expressing human body weight in the UK and Ireland. Here are some examples:

  • "He weighs 12 stone 6" (meaning 12 stones and 6 pounds).
  • A person might say, "I've lost half a stone" (meaning they've lost 7 pounds).

While not commonly used for other quantities, theoretically, one could express the weight of other items in stones. For example:

  • A bag of potatoes weighing 28 pounds could be described as weighing 2 stones.
  • A small dog weighing 35 pounds could be said to weigh 2.5 stones.

It is important to note that stones are generally not used for measuring anything other than human body weight in everyday conversation.

Interesting Facts

  • Decimal Stones: While less common, there is a decimal stone, where the pound is divided decimally to give a fraction of a stone.
  • Other Commodities: Historically, different regions used "stones" to measure varying weights of other commodities, like wool, but the 14-pound stone is now the standard.

Associated Figures

There isn't a specific law or person fundamentally linked to the stone besides its formalization in the Weights and Measures Act. However, due to its use in reporting body weight, health professionals in the UK and Ireland are familiar with this unit.

What is Kilograms?

Kilogram (kg) is the base unit of mass in the International System of Units (SI). It is a fundamental unit used to measure the amount of matter in an object. Unlike units like length or time, the kilogram's definition has historically been tied to a physical artifact.

Defining the Kilogram: From Artifact to Fundamental Constant

The IPK: A Piece of Platinum-Iridium

For over a century, the kilogram was defined by the International Prototype Kilogram (IPK), a platinum-iridium cylinder stored at the International Bureau of Weights and Measures (BIPM) in France. This meant that the mass of every kilogram in the world was traceable back to this single object.

The Problem with the Artifact

The IPK was not a perfect standard. Over time, it was observed to have changed mass slightly compared to its official copies. This instability, however small, was a major concern for scientific measurements that require utmost precision.

The New Definition: Based on Planck's Constant

On May 20, 2019, the kilogram was redefined based on fundamental constants of nature. The new definition is linked to the Planck constant (hh), a cornerstone of quantum mechanics. The Planck constant has a fixed numerical value when expressed in SI units:

h=6.62607015×1034kgm2s1h = 6.62607015 × 10^{-34} kg⋅m^2⋅s^{-1}

By fixing the value of hh, scientists can realize the kilogram through experiments involving quantum phenomena. This change provides a far more stable and reproducible definition than relying on a physical object. The experiment that is commonly used to realize the kilogram based on Planck's constant is called a Kibble balance.

Mass vs. Weight

It's important to distinguish between mass and weight. Mass (measured in kilograms) is the amount of matter in an object, while weight is the force exerted on that object due to gravity. Weight is measured in Newtons (N). The relationship between mass and weight is:

Weight=mass×gravityWeight = mass × gravity or W=mgW = mg

Where:

  • WW is weight (in Newtons)
  • mm is mass (in kilograms)
  • gg is the acceleration due to gravity (approximately 9.81 m/s2m/s^2 on Earth's surface)

Kilograms in Everyday Life: Examples

  • Food: Groceries are often sold by the kilogram, such as fruits, vegetables, and meat.
  • Human Body Weight: People often measure their body mass in kilograms.
  • Construction Materials: Cement, sand, and other building materials are often bought and sold by the kilogram or metric ton (1000 kg).
  • Shipping and Logistics: The weight of packages and cargo is a crucial factor in shipping costs and logistics.

Interesting Facts

  • Prefixes: Kilogram is unique in that it's the only SI base unit with a prefix already in its name ("kilo," meaning 1000).
  • The Kibble Balance: The Kibble balance (also known as a watt balance) is the instrument used to realize the new definition of the kilogram by linking mass to the Planck constant. For more information, you can read about the NIST's Kibble Balance.

Complete Stones conversion table

Enter # of Stones
Convert 1 st to other unitsResult
Stones to Micrograms (st to mcg)6350293180
Stones to Milligrams (st to mg)6350293.18
Stones to Grams (st to g)6350.29318
Stones to Kilograms (st to kg)6.35029318
Stones to Metric Tonnes (st to mt)0.00635029318
Stones to Ounces (st to oz)224
Stones to Pounds (st to lb)14
Stones to Tons (st to t)0.007