30st

30st is most commonly encountered as a shorthand for thirty stone, a unit of mass used in the United Kingdom and Ireland. One stone is equal to 14 pounds, which is about 6.35029 kilograms. Therefore, 30 stone equals 420 pounds or roughly 190.5 kilograms.

The stone unit is part of the imperial measurement system and is not part of the International System of Units (SI). In practice, weight reported as stones is often accompanied by conversions to pounds or kilograms, especially in medical, fitness, or international contexts where metric units are standard.

In everyday usage, people typically say “thirty stone” rather than using the compact written form “30st.” When precise communication is needed across systems, the weight may be presented in kilograms (e.g., 190.5 kg) or pounds (e.g., 420 lb).

Ambiguity: the alphanumeric string “30st” can appear in contexts other than weight, such as product codes, model identifiers, or abbreviations in different domains. In such cases, the intended meaning depends entirely on the specific context, and the weight interpretation should not be assumed without additional information.