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Convert Pound to Stone (ancient) (lb to st (ancient)) 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.
Pound (lb) — an imperial and US customary unit of mass
It is defined as exactly 0.45359237 kilograms; this is the international avoirdupois pound used for ordinary mass and weight measurements. Used mainly in the United States and some other countries for measuring body weight, food, packages, shipping, sports equipment, and everyday masses.
- Symbol: lb
- System: Imperial and US customary unit for mass
- Exact relations: 1 lb = 16 oz = 0.45359237 kg = 453.59237 g
- Metric equivalents: 1 lb ≈ 0.453592 kg ≈ 453.592 g
- Typical examples: a loaf of bread ~1 lb; a laptop ~3 lb; an adult person ~150 lb.
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.