Convert Stone to Kilogram

Quick answer: Stone to Kilogram

1 Stone = 6.350293 Kilogram (st → kg). To convert stone to kilogram, multiply by 6.350293. To convert kilogram to stone, multiply by 0.157473. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common stone-to-kilogram questions.

How to convert Stone to Kilogram

To convert stone to kilogram, multiply the number of stone by the conversion factor 6.350293, because 1 st = 6.350293 kg. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 kg = 0.157473 st, so you divide by 6.350293 (or multiply by 0.157473) to turn kilogram back into stone.

kg = st × 6.350293  ·  st = kg × 0.157473

1. Write down the value you want to convert, in stone.
2. Multiply it by 6.350293.
3. The result is the same area/length/quantity expressed in kilogram.

Stone to Kilogram — worked examples

Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 stone is 31.75147 kilogram because 5 st × 6.350293 = 31.75147 kg.

Common Stone to Kilogram conversions

These are the stone-to-kilogram values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:

• 1 stone = 6.350293 kilogram
• 2 stone = 12.70059 kilogram
• 2.5 stone = 15.87573 kilogram
• 3 stone = 19.05088 kilogram
• 4 stone = 25.40117 kilogram
• 5 stone = 31.75147 kilogram
• 6 stone = 38.10176 kilogram
• 7 stone = 44.45205 kilogram
• 8 stone = 50.80235 kilogram
• 9 stone = 57.15264 kilogram
• 10 stone = 63.50293 kilogram
• 12 stone = 76.20352 kilogram
• 15 stone = 95.2544 kilogram
• 20 stone = 127.0059 kilogram
• 25 stone = 158.7573 kilogram
• 30 stone = 190.5088 kilogram
• 50 stone = 317.5147 kilogram
• 75 stone = 476.272 kilogram
• 100 stone = 635.0293 kilogram
• 200 stone = 1,270.059 kilogram
• 500 stone = 3,175.147 kilogram
• 1000 stone = 6,350.293 kilogram

Stone to Kilogram conversion chart (both directions)

The chart below converts stone to kilogram and kilogram to stone side by side, so it works whichever way you need. 1 stone = 6.350293 kilogram, and 1 kilogram = 0.157473 stone.

Stone vs Kilogram: which is bigger?

A stone is the larger unit: one stone equals 6.350293 kilograms. Put another way, you need 6.350293 kilograms to make a single stone.

What is a Stone? History, origin and usage

The stone was exactly what it sounds like: a stone kept at a market and used as a counterweight. Its value depended on what was being traded — wool, meat, cheese and glass all had different stones, ranging from about five pounds to forty. The Weights and Measures Act of 1835 ended the confusion by fixing the stone at fourteen pounds for all purposes.

The stone survives almost entirely for one job: giving a person's body weight in Britain and Ireland, where weights are read as "eleven stone four" rather than in pounds or kilograms. Doctors, gyms and bathroom scales in those countries still routinely show it.

Fourteen is an unusual number to divide by, and it is a leftover from the wool trade, where eight stone made one hundredweight of 112 pounds. The stone is barely used in the United States, where the same body weight would simply be given in pounds.

What is a Kilogram? History, origin and usage

The kilogram began in revolutionary France in 1795 as the mass of a litre of water at the temperature where water is densest. In 1889 that idea was replaced by a physical object: the International Prototype of the Kilogram, a platinum-iridium cylinder kept in a vault at Sèvres near Paris. For 130 years the kilogram was whatever that one lump of metal weighed. The problem was that the official copies slowly drifted apart from it by tens of micrograms, so on 20 May 2019 the definition was cut loose from the object and tied instead to a fixed value of the Planck constant.

The kilogram is the SI base unit of mass and the working weight unit for almost the whole world — shopping, medicine, freight, engineering and science. Every other unit on this page, metric or imperial, is defined by how many kilograms it equals, which is why the conversions here are exact rather than rounded.

It is the only SI base unit whose name carries a prefix built in ("kilo" + "gram"), a historical accident that means the SI prefix rules have to be applied to the gram instead. It was also the last base unit still defined by a man-made object, and the only one that could be scratched, cleaned or dropped.

Convert 1 Stone to other units

It can help to see a stone next to the other units it is commonly compared with. One stone (st) is equal to:

Convert 1 Kilogram to other units

One kilogram (kg) is equal to:

Tips for converting Stone to Kilogram

• To go from stone to kilogram, multiply by 6.350293; to go back, divide by 6.350293 (or multiply by 0.157473).
• For a quick mental estimate, remember that 1 stone ≈ 6.350293 kilogram, so 10 stone ≈ 63.50293 kilogram.
• The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
• Both fields update live as you type — change either side to convert in that direction.

How to use this Stone to Kilogram converter

Type a number into the Stone field and the equivalent in Kilogram appears instantly — there is no “convert” button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Kilogram field to convert the other way (kilogram to stone). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above — use the chart for quick look-ups and the tool for precise work.

Accuracy and method

Every figure on this page — the formula, the worked examples, the conversion chart and the “convert to other units” tables — is computed from a single verified conversion factor (1 st = 6.350293 kg), never copied from a hand-typed lookup table that could drift. That factor is derived from each unit’s definition in terms of a common base unit, and an automated check re-verifies all of the site’s factors on every update, so the numbers here stay correct over time. This matters for stone-to-kilogram conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.

Sources

• NIST Special Publication 811 — Guide for the Use of the SI — publishes the exact metric equivalents of the customary weight units. The 1959 international yard-and-pound agreement fixes the international avoirdupois pound at exactly 0.453 592 37 kilogram, and the ounce, stone, grain and both tons are defined as exact fractions or multiples of that pound — so every imperial weight on this page is exact, not rounded.
• BIPM — The International System of Units (SI Brochure) — the defining document for the SI, published by the International Bureau of Weights and Measures. It fixes the base unit that this conversion resolves to, which is why the factor here can be exact rather than approximate.

Weight factors here are exact, anchored to the kilogram: the international pound is exactly 0.45359237 kg, a stone is 14 pounds, a short ton is 2,000 pounds and a long ton is 2,240, a grain is 1/7000 of a pound and a metric carat is exactly 200 mg. So the live tool and every number on this page always agree.

Frequently asked questions

How many kilogram are in 1 stone?

1 stone = 6.350293 kilogram (kg). To convert any number of stone to kilogram, multiply by 6.350293.

How do I convert stone to kilogram?

Multiply the number of stone by 6.350293. For example, 10 stone = 10 × 6.350293 = 63.50293 kilogram, and 25 stone = 158.7573 kilogram.

How many stone are in 1 kilogram?

1 kilogram = 0.157473 stone. So to convert kilogram back to stone, multiply by 0.157473.

What is the formula to convert stone to kilogram?

kilogram = stone × 6.350293. The reverse formula is stone = kilogram × 0.157473.

How much is 100 stone in kilogram?

100 stone = 635.0293 kilogram. (And 1000 stone = 6,350.293 kilogram.)

Which is bigger, a stone or a kilogram?

A stone is larger: 1 stone = 6.350293 kilogram.

Is this stone to kilogram converter accurate?

Yes — every value is computed from the exact 6.350293 kg per st factor (not rounded look-up tables), and the factors are re-verified automatically on every update.

Can I convert kilogram to stone too?

Yes. The converter works both ways — enter a value in either field. 1 kilogram = 0.157473 stone.

Related weight conversions

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• Pound to Kilogram
• Stone to Pound
• Pound to Stone
• Gram to Kilogram
• Kilogram to Gram
• Tonne to Kilogram
• Kilogram to Tonne
• Quintal to Kilogram

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