Convert Stone to UK Ton (st → ton (UK))

Converting stones to UK tons is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in stones

   Start with the number of stones (st) you want to convert.
2. 2
   Multiply by 0.00625

   The conversion factor from st to ton (UK) is 0.00625. Multiply your value by this number.
3. 3
   Read the result in UK tons

   The result is your value in UK tons (ton (UK)).

Multiply the value in stones by 0.00625. For the reverse direction, multiply by 160.

• ✓1 stone = 14 lb = 6.35 kg exactly.
• ✓British speakers often say "11 stone 4" meaning 11 stone and 4 pounds — not 11.4 stone.
• ✓Multiply stones by 6.35 for a precise kg conversion.

• ✗Reading "11 stone 4" as 11.4 stone — it is 11 × 14 + 4 = 158 lb.
• ✗Using stones outside UK/Ireland contexts — audiences elsewhere will not understand.
• ✗Multiplying by 6 instead of 6.35 for a quick kg estimate — 5% error.

What is the Stone?

The stone equals exactly 14 pounds or 6.35029318 kilograms and remains the traditional British unit for personal body weight. Originally based on a stone literally used as a counterweight on a balance scale, the unit was standardized at 14 pounds by an Act of Parliament in 1835. While metrication has reduced its role in commerce, the stone persists in British everyday life — a person is described as '11 stone 4' (158 lb) rather than 72 kg — and is widely used in British and Irish weight-loss programs, medical contexts, and gym equipment. The stone is virtually unknown in the United States and most of the world. It relates to the pound (14 lb = 1 stone), the kilogram (1 stone ≈ 6.35 kg), and the long ton (160 stone = 1 long ton). Stones-and-pounds notation (like '11 st 4 lb') is the British equivalent of decimal kilograms.

• Human body weight in the UK and Ireland
• British medical charts and patient records
• British boxing and wrestling press reports

What is the UK Ton?

The UK long ton equals exactly 2,240 pounds or 1,016.0469088 kilograms, and was historically the standard weight unit in the British Empire and remains in use in shipping, mining, and engineering throughout the United Kingdom and Commonwealth countries. The long ton is closer in size to the metric ton (only 1.6% lighter), which is why it has resisted complete replacement. Shipping displacement, especially of older and military vessels, is often quoted in long tons (the British Royal Navy historically used long tons for ship tonnage). It relates to the hundredweight (20 cwt = 1 long ton), the pound (2,240 lb = 1 long ton), and the metric ton (1 long ton ≈ 1.016 t). The long ton's name reflects its larger size compared to the US short ton (2,000 lb).

• Older UK shipping and commodity contracts
• British naval displacement tonnage (ships)
• Historical coal and steel production data