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Convert Stone (ancient) to Long Ton (st (ancient) to ton (Imp)) instantly with accurate, readable results.
Use our Mass Unit Converter to convert between grams, kilograms, pounds, ounces, and other weight units instantly. Designed for cooking, science, fitness, and engineering needs, this unit conversion tool offers accurate results between metric and imperial systems. Whether you’re tracking body weight, measuring ingredients, or handling heavy machinery, our mass unit conversion calculator has you covered.
Stone (ancient) — a variable historical unit of mass
It was not a single fixed unit; in ancient and medieval use, a “stone” could mean a locally chosen trade weight, often varying by region, period, and commodity. Used historically for weighing goods such as wool, grain, meat, and other trade commodities, and for stone weights used as practical measuring standards.
- Symbol: stone, st
- System: Historical unit for mass; not a fixed SI or modern imperial standard in ancient use
- Common historical range: about 4 to 32 lb ≈ 1.814 to 14.515 kg, depending on context
- Modern reference point: the later British imperial stone is exactly 14 lb = 6.35029318 kg
- Typical examples: trade stones could be used for wool, grain, or livestock products; a “stone” in one market might differ from a “stone” in another; historical records should be interpreted by period and location.
Long ton (UK ton) — an imperial unit of mass equal to 2240 pounds
It is defined as exactly 2240 avoirdupois pounds; since 1 lb = 0.45359237 kg exactly, 1 long ton = 1016.0469088 kg exactly. Used mainly in the United Kingdom and some Commonwealth contexts for measuring large masses in shipping, industry, freight, and historical trade.
- Symbol: long ton, UK ton
- System: Imperial unit for mass
- Exact relations: 1 long ton = 2240 lb = 35,840 oz = 1016.0469088 kg
- Metric equivalents: 1 long ton ≈ 1016.05 kg ≈ 1.01605 t
- Typical examples: ship displacement may be measured in long tons; heavy freight can be listed in long tons; 1 long ton is slightly heavier than a metric ton.