Why is the ratio exactly 8?

Because the hundredweight was defined as 8 stones. The stone of 14 pounds was established first for the wool trade, and the hundredweight was constructed as a practical multiple of it. Eight stones provided a weight that one or two strong workers could handle - roughly 50 kilograms - making it the natural unit for cargo loading.

Are stones still used in the UK?

Yes, for body weight. British people overwhelmingly describe their weight in stones and pounds. A British person saying 'I weigh 12 stone' means 168 pounds or about 76 kilograms. The stone has been legally obsolete since 1985 but remains the de facto standard for personal weight across the UK and Ireland.

How does the stone relate to other Imperial units?

One stone equals 14 pounds, 8 stones make a hundredweight (112 pounds), and 160 stones make a long ton (2,240 pounds). The stone sits in the middle of the Imperial weight hierarchy, bridging the gap between the pound used for everyday objects and the hundredweight used for bulk commodities.

Hundredweights (UK) to Stones (cwt to st) Converter

1 cwt = 8 st

1 Hundredweight (UK) equals 8 Stones (1 cwt = 8 st). Convert Hundredweights (UK) to Stones with formula, table, and examples.

One long hundredweight equals exactly 8 stones. This is one of the cleanest ratios in the entire Imperial weight system - 8 stones of 14 pounds each produce exactly 112 pounds, which is one long hundredweight. Both units are quintessentially British and remain in informal use in the UK today.

How to Convert Hundredweights (UK) to Stones

st = cwt × 8

Multiply the value in Hundredweights (UK) by 8

Take your value in Hundredweights (UK)
Multiply by 8
Read the result in Stones

Common Hundredweights (UK) to Stones Conversions

Hundredweights (UK) (cwt)	Stones (st)	Status
0.25 cwt	2 st
0.5 cwt	4 st
1 cwt	8 st
2 cwt	16 st
5 cwt	40 st
8 cwt	64 st
10 cwt	80 st
16 cwt	128 st
20 cwt	160 st
25 cwt	200 st
50 cwt	400 st
100 cwt	800 st
200 cwt	1,600 st
500 cwt	4,000 st

Good to Know About Hundredweights (UK) to Stones Conversion

The stone and the hundredweight are the two most culturally persistent units in the British Imperial system. Both were officially retired decades ago, yet both survive in everyday British life - the stone for body weight, the hundredweight in agricultural memory. Their clean 8:1 ratio reflects the elegant internal logic of a system that was designed by practical merchants for practical purposes. When a British person says they weigh '10 stone,' they are unconsciously invoking a measurement hierarchy that stretches from the medieval wool market to the Victorian coal dock, through the stone to the hundredweight to the ton.

Hundredweights (UK) to Stones: What You Need to Know

The stone-to-hundredweight ratio was fundamental to British commerce for centuries. Market traders sold goods by the stone and tallied their sales in hundredweights. A farmer bringing produce to market might weigh individual sacks in stones and report his total delivery in hundredweights. Even today, British people who weigh themselves in stones intuitively understand that 8 stones is roughly one hundredweight - a cognitive link that survives long after both units' commercial retirement.

What is a Hundredweight (UK)? cwt

A UK hundredweight (long hundredweight) is exactly 112 pounds or 50.80234544 kilograms. Used in British agriculture and traditional commerce.

Imperial UK agriculture traditional British commerce

Learn more about Hundredweight (UK) →

What is a Stone? st

A British unit of mass equal to 14 pounds or approximately 6.35 kilograms. Commonly used in the UK and Ireland for body weight.

Imperial body weight (UK/Ireland) horse racing

Learn more about Stone →

Going the other way? Use our Stones to Hundredweights (UK) converter.

Hundredweights (UK) to Stones FAQ

Because the hundredweight was defined as 8 stones. The stone of 14 pounds was established first for the wool trade, and the hundredweight was constructed as a practical multiple of it. Eight stones provided a weight that one or two strong workers could handle - roughly 50 kilograms - making it the natural unit for cargo loading.
Yes, for body weight. British people overwhelmingly describe their weight in stones and pounds. A British person saying 'I weigh 12 stone' means 168 pounds or about 76 kilograms. The stone has been legally obsolete since 1985 but remains the de facto standard for personal weight across the UK and Ireland.
One stone equals 14 pounds, 8 stones make a hundredweight (112 pounds), and 160 stones make a long ton (2,240 pounds). The stone sits in the middle of the Imperial weight hierarchy, bridging the gap between the pound used for everyday objects and the hundredweight used for bulk commodities.

Non-Frequently Asked Questions About Hundredweights (UK) to Stones

Questions nobody should ask - but someone did.

Exactly one-eighth. Losing a stone (14 pounds or 6.35 kg) is a common British fitness goal, and framing it as one-eighth of a hundredweight makes it sound simultaneously more impressive and more archaic. No personal trainer has ever motivated a client by saying 'you only need to lose one-eighth of a hundredweight,' but the math checks out.
The 14-pound stone descends from the medieval wool trade, where it was the standard weight for pricing raw wool. Fourteen pounds divided neatly into halves (7 lbs) and quarters (3.5 lbs), making market transactions easy. The choice of 14 predates decimalization by centuries and reflects a time when divisibility by 2 and 7 mattered more than divisibility by 10.
It is spectacularly British. The stone is used almost nowhere outside Britain and Ireland, and the long hundredweight is exclusively British Imperial. Expressing one in terms of the other is speaking a measurement dialect that approximately 70 million people understand and 7 billion people find baffling. It is the metrological equivalent of Cockney rhyming slang.