How Many Pounds Is a Stone?
A stone is 14 pounds (6.35 kg, or 224 ounces). It is the British and Irish unit of weight, fixed at exactly 14 lb since 1835. Convert any value below.
1 stone =
14lb
- 1 st
- 6.35 kg
- 224 oz
Stone to Pounds Chart
Look up 1 to 20 stone in pounds and kilograms, without doing any arithmetic.
| Stone | Pounds | Kilograms |
|---|---|---|
| 1 | 14 | 6.35 |
| 2 | 28 | 12.70 |
| 3 | 42 | 19.05 |
| 4 | 56 | 25.40 |
| 5 | 70 | 31.75 |
| 6 | 84 | 38.10 |
| 7 | 98 | 44.45 |
| 8 | 112 | 50.80 |
| 9 | 126 | 57.15 |
| 10 | 140 | 63.50 |
| Stone | Pounds | Kilograms |
|---|---|---|
| 11 | 154 | 69.85 |
| 12 | 168 | 76.20 |
| 13 | 182 | 82.55 |
| 14 | 196 | 88.90 |
| 15 | 210 | 95.25 |
| 16 | 224 | 101.60 |
| 17 | 238 | 107.95 |
| 18 | 252 | 114.31 |
| 19 | 266 | 120.66 |
| 20 | 280 | 127.01 |
Half Stone and Part Stone Values
Real body weights rarely land on a whole stone. A stone and a half is 21 pounds, half a stone is 7 pounds, and the table below runs in half stone steps all the way to 10 stone.
| Stone | St & lb | Pounds | Kilograms |
|---|---|---|---|
| 0.5 | 0 st 7 lb | 7 | 3.18 |
| 1 | 1 st | 14 | 6.35 |
| 1.5 | 1 st 7 lb | 21 | 9.53 |
| 2 | 2 st | 28 | 12.70 |
| 2.5 | 2 st 7 lb | 35 | 15.88 |
| 3 | 3 st | 42 | 19.05 |
| 3.5 | 3 st 7 lb | 49 | 22.23 |
| 4 | 4 st | 56 | 25.40 |
| 4.5 | 4 st 7 lb | 63 | 28.58 |
| 5 | 5 st | 70 | 31.75 |
| Stone | St & lb | Pounds | Kilograms |
|---|---|---|---|
| 5.5 | 5 st 7 lb | 77 | 34.93 |
| 6 | 6 st | 84 | 38.10 |
| 6.5 | 6 st 7 lb | 91 | 41.28 |
| 7 | 7 st | 98 | 44.45 |
| 7.5 | 7 st 7 lb | 105 | 47.63 |
| 8 | 8 st | 112 | 50.80 |
| 8.5 | 8 st 7 lb | 119 | 53.98 |
| 9 | 9 st | 126 | 57.15 |
| 9.5 | 9 st 7 lb | 133 | 60.33 |
| 10 | 10 st | 140 | 63.50 |
What Is a Stone in Weight?
The stone is one of the oldest units still in everyday use, and its definition has not budged in nearly two centuries.
A stone (abbreviated "st") is a unit of mass in the British imperial system of weight, defined as exactly 14 pounds, written 14 lbs, or 6.35029318 kilograms. Plenty of old units varied by region or trade. This one does not. The British Imperial Weights and Measures Act of 1835 wrote the stone of 14 pounds into national law, and it still appears at that same value in Schedule 1 of the Weights and Measures Act 1985, the statute in force today.1
Why Is a Stone 14 Pounds?
The most likely reason: wool won. Before standardisation, a "stone" meant whatever the trade said it meant: wool, meat, glass, and grain each carried their own local value, and surveys of British towns in the 1800s recorded stones ranging from roughly 4 lb all the way up to 26 lb.5 When Parliament unified weights and measures in the 19th century, it picked the one everybody already knew. The wool stone of 14 lb was the most widely used figure in England, and wool was the country's dominant export trade, so 14 became the law and the rest fell away.
Why Is Stone Used for Weight, and Why Do the British Still Use It?
Habit, mostly. The United Kingdom adopted the metric system decades ago for most measurements, and the stone can no longer be used for trade at all.4 Body weight is the one corner where it survived. The unit is baked into everyday British and Irish speech (people say "I weigh 11 stone," never "70 kilograms"), it is printed on bathroom scales sold in the UK, and the NHS BMI calculator still accepts a weight entered in stones and pounds.3 No policy keeps the stone alive. Familiarity does.
How Many Pounds Is a Stone in the UK?
One answer covers England, Scotland, Wales, Northern Ireland, and the Republic of Ireland.
Fourteen. There is no regional variation left to worry about. The stone in England is the same as the stone in Britain, which is the same as the stone in the UK, which is the same as the stone in Ireland. Whatever phrasing brought you here, the number does not move. That has been true since 1835, when the older stones that varied from town to town were replaced in law by a single value.
Where confusion does creep in is the way British readings are spoken. A weight gets given as whole stone plus leftover pounds, never as a decimal, so "eleven stone four" means 11 × 14 + 4 = 158 lb, not 11.4 stone. Those leftover pounds always run from 0 to 13. Hit 14 and they roll into the next stone. The converter above prints both forms at once, so you can read the decimal and the spoken "st + lb" version side by side and see exactly how they line up.
The other place people get caught out is the Atlantic crossing. The stone is effectively unused in the United States and Canada, where body weight gets quoted in pounds alone, and unused across continental Europe, where kilograms are standard. So the same person can be described three ways: 11 st 4 lb in the UK, 158 lb in the US, and 71.7 kg almost everywhere else. All three describe an identical mass, because the UK and US have shared one avoirdupois pound of exactly 0.45359237 kg since the international agreement of 1959.2
How Many Pounds Is a Stone for Body Weight?
Body weight is the last surviving everyday use of the unit, and it has its own conventions.
Still 14 pounds. The unit does not change meaning when it is a person on the scale rather than a sack of wool. What changes is the notation. For body weight the stone almost always comes paired with a remainder, and that pairing is exactly what makes it useful: one pound gained or lost shows up in the reading, while a decimal figure like 11.07 stone tells nobody anything at a glance.
A few reference points to anchor the scale. A stone is roughly a car tyre, or a large bag of potatoes. Half a stone, 7 lb, is a common milestone when losing weight and about what an average newborn weighs. Two stone is 28 lb. And when someone says they have "lost a stone and a half," they mean 21 pounds, or about 9.5 kg.
One caution worth stating plainly. Converting your weight is arithmetic. Interpreting it is not. A figure in stone means very little without height and build alongside it, which is why the NHS BMI calculator asks for both and takes the weight in stones and pounds directly.3 This page converts numbers. It does not assess health. For that, talk to a GP or a registered dietitian.
A Stone in Other Units
The same definition of 14 pounds, expressed in whichever unit you need next.
- One stone is 14 pounds, legalised by the Weights and Measures Act of 1835.
- One pound is 16 ounces, so a stone is 14 × 16 = 224 ounces.
- One stone is 6.35029318 kilograms, usually rounded to 6.35 kg.
- That same figure in grams is 6,350.29 grams.
Converting Stone and Pounds to Kg
A "st + lb" reading has two parts, so collapse it into one number before you convert. Multiply the stone by 14, add the leftover pounds, then multiply that total by 0.45359237. That last figure is the exact number of kilograms in one avoirdupois pound, settled by international agreement in 1959 and published by NIST.2
- kg = ((stone × 14) + pounds) × 0.45359237
- Worked example, 9 st 7 lb: (9 × 14) + 7 = 133 lb, then 133 × 0.45359237 = 60.33 kg
- Reversing it: kg ÷ 6.35029318 = stone. So 80 kg ÷ 6.35029318 = 12.6 stone, or 12 st 8.4 lb.
About This Stone to Pounds Converter
What the tool does, how to drive it, and where its numbers come from.
This site does one job. It answers a single question, how many pounds is a stone, and then lets you run that same conversion on any figure you have, in any direction you need. Search for this and most results hand you a sprawling calculator carrying hundreds of unrelated unit categories, where the stone row sits buried three dropdowns deep. Here the answer is the first thing you see, already rendered before a single line of JavaScript has run, and the tool underneath it does nothing else.
How to Use It
The converter carries four linked fields: stone, pounds, kilograms, and ounces. They are not four separate calculators. Type into whichever one matches the number you already have, and the other three rewrite themselves as you type. No convert button, no page reload, no submit step. Put 11 into the stone field and pounds immediately reads 154. Put 154 into the pounds field and stone reads 11. Paste a kilogram figure off a doctor's printout and the British reading appears without you doing any arithmetic in your head.
Above the fields sits a readout that restates the current value four ways at once: the headline figure in pounds, the spoken British "st + lb" form, the kilogram equivalent, and ounces. That compound form is the part most converters skip, and it is usually the one you actually want, because scales in the UK show 12 st 6 lb rather than 12.43 st. The readout is marked as a live region, so a screen reader announces each new result as it lands, and you can drive the whole tool from the keyboard alone.
Decimals, Commas, and Bad Input
Fractional entries work everywhere. Type 1.5 stone and you get 21 pounds; type 0.5 and you get 7. A comma works as a decimal separator too, so 6,35 kg reads the same as 6.35 kg for anyone whose keyboard and habits follow the European convention. Clear a field and the others blank out rather than leaving a stale answer on screen. Enter something negative or non numeric and a short prompt appears instead of silent nonsense. One reset control puts everything back to a default of one stone.
Where the Numbers Come From
Every figure on this page, the live converter and the printed charts alike, comes from two constants held in a single file: 14 pounds per stone, and 0.45359237 kilograms per pound. Both are the exact statutory values rather than rounded approximations, and both are cited in the sources at the bottom of the page. Because the charts are computed from the same constants the converter reads, the tables and the tool cannot drift apart or contradict each other. Rounding happens once, at the final display step, to two decimal places.
Speed and Privacy
The conversion runs entirely inside your browser. Nothing you type is transmitted, logged, or stored anywhere, because there is no calculation happening on a server to send it to. The page is static HTML built ahead of time, the font is hosted here rather than fetched elsewhere, and the icons are inlined, so no third party widget script is holding up the first paint. It works on a phone and holds its layout down to a 320 pixel screen without sideways scrolling. Nothing to install, no account to create, no paywall on any part of it.
Who It Is For
Three groups land here most often. British and Irish readers who know their weight in stone and need it in pounds or kilograms for a form, a flight booking, or an American doctor. Americans and Australians reading a British article, novel, or news report who hit a figure like "fourteen stone" with no instinct for how heavy that is. And people tracking a change rather than a total, turning a seven pound loss into half a stone, or checking what a stone and a half comes to. The whole stone chart serves the first two groups, the half stone ladder serves the third, and whichever question brought you here, the answer should already be printed somewhere on this page rather than something you have to work out.
Frequently Asked Questions
Direct answers to the stone and pound questions people search for most.
How many pounds is a stone?
One stone is exactly 14 pounds. That figure is fixed, not approximate: the stone has been defined as 14 avoirdupois pounds in British law since the Weights and Measures Act of 1835, and it is still listed at 14 pounds in Schedule 1 of the Weights and Measures Act 1985.
How many pounds is a stone equal to?
A stone is equal to 14 pounds, 224 ounces, or 6.35029318 kilograms. To go the other way, divide pounds by 14: 14 lb is 1 stone, 28 lb is 2 stone, 42 lb is 3 stone, and so on.
How many pounds is a stone and a half?
A stone and a half is 21 pounds (1.5 × 14), which is about 9.53 kilograms. Half a stone on its own is 7 pounds.
How many pounds is a stone in England?
Fourteen pounds, the same as everywhere else. There is no separate English, Scottish, Welsh, or Irish stone in modern use. The 1835 Act swept away the old regional stones, which ranged from about 5 lb to 26 lb depending on the town and the goods, and left one stone of 14 pounds behind.
How many pounds is a stone in the UK?
14 pounds, written 14 lbs. UK bathroom scales, NHS height and weight charts, and everyday conversation all use the stone of 14 pounds, so a British weight given as "11 stone 4" means 158 lbs.
Is a stone the same in the United States?
The stone is not used in the United States. Americans state body weight in pounds alone, so 11 stone is simply "154 pounds". When a US source does mention a stone, it means the same 14 pounds, because the UK and US share one avoirdupois pound of exactly 0.45359237 kg.
How many kg in a stone?
One stone is 6.35029318 kilograms, usually rounded to 6.35 kg. The exact figure comes from the international pound of 0.45359237 kg: 14 × 0.45359237 = 6.35029318.
How do you convert stone and pounds to kg?
Turn the reading into total pounds first, then multiply by 0.45359237. For 12 stone 6 lb: (12 × 14) + 6 = 174 lb, and 174 × 0.45359237 = 78.93 kg.
How many ounces are in a stone?
There are 224 ounces in a stone. A pound is 16 ounces, so 14 × 16 = 224 oz, or 6,350.29 grams.
Why is a stone 14 pounds?
14 pounds was the wool stone, and wool was England's dominant export trade, so that value was already the most widely recognised one when Parliament standardised weights in 1835. Competing stones of 5, 8, and 12 pounds existed for glass, meat, and other goods, but the wool stone was the one written into law.
Why do Brits use stone for weight?
The stone was a standard unit for weighing goods, produce, and livestock in medieval Britain, and Parliament fixed it at 14 pounds in 1835. Britain and Ireland officially switched to metric decades ago, but "stone" stuck around as the everyday way people talk about body weight, the same way Americans still use pounds instead of kilograms.
What is a stone in weight, exactly?
A stone is a unit of mass equal to 14 pounds, or 6.35029318 kilograms. It sits between the pound and the hundredweight in the old British imperial system, and today it is used almost exclusively for describing a person's body weight.
What is 10 stone in pounds?
10 stone is 140 pounds (10 × 14), which is about 63.5 kilograms.
What is 20 stone in pounds?
20 stone is 280 pounds (20 × 14), which is about 127.01 kilograms.
How heavy is 100 lbs in stone?
100 pounds is 7.14 stone, or 7 stone 2 pounds (100 ÷ 14 = 7 remainder 2).
How heavy is 80 lbs in stone?
80 pounds is 5.71 stone, or 5 stone 10 pounds (80 ÷ 14 = 5 remainder 10).
What is 180 lbs in stone and pounds?
180 pounds is 12.86 stone, or 12 stone 12 pounds (180 ÷ 14 = 12 remainder 12).
What is 500 lbs in stone and pounds?
500 pounds is 35.71 stone, or 35 stone 10 pounds (500 ÷ 14 = 35 remainder 10).
How many stone is 70 kg?
70 kilograms is 11.02 stone, or 11 stone 0.3 pounds (70 ÷ 6.35029318).
Is 180 pounds considered heavy?
It depends entirely on height, build, and body composition, not the number alone. A person's healthy weight range is usually judged against height (for example, using a BMI chart) rather than a single weight figure. If you are concerned about your weight, a doctor or registered dietitian can give guidance specific to you.
Sources and References
Every conversion figure on this site traces back to a published standard. These are the ones it relies on, and you can check any of them yourself.
- Weights and Measures Act 1985, Schedule 1 (Definitions of Units)UK Government, legislation.gov.ukThe statute in force. Lists the stone at 14 pounds and the pound at 0.45359237 kilograms.
- NIST Special Publication 811, Appendix B: Conversion FactorsUS National Institute of Standards and TechnologyGives the avoirdupois pound as exactly 0.45359237 kg, the figure behind 1 stone = 6.35029318 kg.
- BMI calculator (accepts weight in stones and pounds)NHSShows the stone still in official UK use for body weight, and adds the height context this page deliberately does not.
- Weights, measures and packaging: the lawGOV.UKSets out which units may legally be used for trade in the UK today.
- Stone (unit): historical regional valuesWikipediaBackground on the stones in use before 1835, which ranged from roughly 4 lb to 26 lb by town and trade.
- Avoirdupois weightEncyclopaedia BritannicaOverview of the wider avoirdupois system of pounds and ounces that the stone belongs to.
Last reviewed 23 September 2026. Spotted a figure that looks wrong?Tell us and it will be checked against the sources above.