Lbs to Stone Converter

1. Keep the direction on Pounds to stone. Switch it to convert a stone value back into pounds.
2. Type the weight in pounds. Decimals such as 154.3 lb work.
3. Read the answer as stone plus pounds, the way a UK scale or form shows it. Decimal stone and kilograms sit underneath.

Each result line has one job:

A pound to stone conversion rewrites a weight in pounds (lb) as stone (st), a larger British unit equal to exactly 14 pounds. The UK Weights and Measures Act 1985 defines the stone as 14 pounds and the pound as 0.45359237 kilogram.

The stone belongs to the British avoirdupois table. NIST Handbook 44 notes that the British table matches the US one up to 1 pound. Above that point Britain counts 14 pounds to the stone, 2 stones to the quarter and 112 pounds to the hundredweight.

People in the UK often give adult body weight in stones and pounds. The NHS BMI page, for example, describes 70 kg as around 11 stone. This page helps anyone who knows a weight in pounds and needs the British form, such as a US visitor filling in a UK form.

A stone is not a metric unit, and it is not used in US daily life. UK law lists it among units that may not be used for trade except as supplementary indications.

You divide the pounds by 14, then split the answer into whole stones and leftover pounds.

1. Take the weight in pounds, for example 185 lb.
2. Divide by 14: 185 / 14 = 13.2143. The whole number, 13, is the stone.
3. Multiply the whole stones by 14 and subtract: 185 - 182 = 3. So 185 lb is 13 st 3 lb.

The factor 14 is exact, so the conversion adds no error. Only the decimals you keep can shift the answer.

An even result. A person weighs 168 lb. 168 / 14 = 12 with nothing left over, so the answer is 12 st 0 lb, or 76.20 kg.

A remainder. A US scale reads 150 lb. 150 / 14 = 10.714, so there are 10 whole stones. 10 x 14 = 140, and 150 - 140 = 10. The answer is 10 st 10 lb.

A decimal pound. A digital scale shows 220.5 lb. 15 x 14 = 210, which leaves 10.5 lb. The answer is 15 st 10.5 lb, or exactly 15.75 st.

Stone back to pounds. A UK form says 9.5 st. 9.5 x 14 = 133 lb, which is 9 st 7 lb. For the full metric answer, the lbs to kg converter gives kilograms directly.

Each row is pounds / 14. The kilogram column uses 1 lb = 0.45359237 kg and is rounded to 2 decimals.

Every multiple of 14 lb lands on a whole stone: 98, 112, 126, 140, 154, 168, 182 and 196 lb are 7 to 14 st.

The 14 pound factor never changes, so only the way you write and round the answer can differ.

Decimal Stone vs Stone and Pounds

10.5 st means ten and a half stone, which is 10 st 7 lb. It never means 10 st 5 lb. The tool shows both forms so they cannot be confused.

Rounding the Leftover Pounds

A bathroom scale may round to the nearest 0.2 lb or 0.1 kg. The tool keeps two decimals in the leftover pounds. Round the final line, not the factor.

Scale Units and Settings

Many digital scales switch between kg, lb and st lb. Readings taken on different settings can round differently by a fraction of a pound.

Clothing and Time of Day

Body weight moves during the day with food, drink and clothes. The converter treats your number as exact. It cannot correct for how it was measured.

All three units measure the same mass. They differ in size, in where people use them and in their legal status.

A US vs UK trap sits one step up. The US hundredweight is 100 lb, but the UK hundredweight is 112 lb, or 8 stone. The stone itself has no US version.

Reading UK Body Weight

UK adults often say they weigh "11 stone 4" rather than 158 lb. Converting lets a US reader compare the two. Health tools usually work in kilograms, so the weight loss calculator is the next step for planning.

Forms, Fitness Logs and Travel

A UK gym card, a medical form or a sports entry may ask for stones and pounds. A person who knows only their pound weight can fill it in with this tool.

Tracking Change Over Time

Going from 13 st 2 lb to 12 st 9 lb is a 7 lb change. Converting both to pounds first (184 and 177) makes the gap easy to see.

Heavier Loads

The UK hundredweight is 112 lb, or 8 stone, and the UK ton is 160 stone. For really large loads, the ton to lbs converter covers US and UK tons.

Dividing by 14 is easier with a few anchors. The first three tricks are exact; the last has a small, stated error.

• Anchor on 140. 140 lb is exactly 10 st. Count up or down from there: 150 lb is 10 st plus 10 lb.
• Seven pound halves. Each 7 lb is half a stone, so 161 lb is 11.5 st, or 11 st 7 lb.
• Stone to pounds by 10 plus 4. 12 st: 120 + 48 = 168 lb. Exact.
• Kilograms to stone, roughly. Divide kg by 6.35. Using 6.4 gives an answer about 0.8 percent too low.

For pounds broken into ounces, the pounds to ounces converter uses the exact 16 ounce pound.

1. Reading Decimal Stone as Pounds

12.5 st is 12 st 7 lb, not 12 st 5 lb. The digits after the point are tenths of a stone, and one tenth is 1.4 lb.

2. Dividing by 10 or 16

Ten belongs to metric prefixes and sixteen to ounces in a pound. The stone is always 14 lb.

3. Mixing Up the Two Hundredweights

A UK hundredweight is 112 lb, which is 8 stone. The US hundredweight is 100 lb, about 7.14 stone.

4. Rounding Before You Divide

Rounding 154.3 lb down to 154 gives exactly 11 st and hides 0.3 lb. Convert first, then round the leftover pounds.

5. Treating Stone as a Metric Unit

A stone is 6.35 kg, not 6 kg or 7 kg. Using 6 kg per stone makes an 11 stone person look 3.85 kg lighter.

The conversion is exact, because UK law fixes the stone at 14 pounds and the pound at 0.45359237 kg.

200 pounds is 14 st 4 lb. That is 14.2857 stone as a decimal, or 90.72 kg.

Half a stone is 7 pounds. A quarter stone is 3.5 pounds.

Eleven stone is 154 pounds, or 69.85 kg. The NHS uses 70 kg, which it calls around 11 stone, as its worked BMI example.

UK law still defines the stone as 14 pounds, so it remains a valid way to state weight in everyday speech and on home scales. For trade, the law lists it only as a supplementary unit, so kilograms come first.

No. US body weight is given in pounds. NIST Handbook 44 lists the stone only in its notes on British units.

Take the 0.5 and multiply by 14: 0.5 x 14 = 7. So 12.5 st is 12 st 7 lb, which is 175 lb.

100 kg is 220.46 lb, which is 15 st 10.46 lb, or 15.75 st as a decimal.

It means 11 stone plus 4 pounds. That is 11 x 14 + 4 = 158 lb.

Yes. The Weights and Measures Act 1985 applies across the UK and fixes the stone at 14 pounds everywhere, so 1 st is 6.35029318 kg in every part of the country.

Most people round to the nearest pound. The tool keeps two decimals of a pound so you can round at the end.

No. The conversion runs in your browser and nothing is sent to our servers. A result you choose to Save stays in this browser only.

• Stone = 14 pounds and pound = 0.45359237 kilogram in UK law (Weights and Measures Act 1985, Schedule 1, Part VI, legislation.gov.uk).
• British avoirdupois table: 14 pounds = 1 stone, 112 pounds = 1 hundredweight (NIST Handbook 44, 2026, Appendix C).
• Pound (avoirdupois) to kilogram conversion factor (NIST SP 811, Appendix B.8).
• 70 kg described as around 11 stone in a worked BMI example (NHS, Calculate your BMI for adults).