Weight Converter

1 kg = 2.20462 lbs and 1 lb = 0.45359237 kg. For a quick mental estimate, divide pounds by 2.2. Body weight examples: 150 lbs = 68 kg; 200 lbs = 91 kg. A metric ton equals 1,000 kg = 2,205 lbs, while a US short ton is 2,000 lbs = 907 kg. The exact factor, 0.45359237 kg per pound, was fixed by international agreement in 1959.

No. A dry ounce (oz) measures mass (about 28.35 g), while a fluid ounce (fl oz) measures volume (about 29.57 mL in the US). Sixteen dry ounces equal 1 pound; 16 fluid ounces equal 1 US pint (about 473 mL). The difference matters in cooking: 1 cup of water is 8 fl oz and weighs about 236 g, but 1 cup of flour is also 8 fl oz yet weighs only about 120 g.

1 stone = 14 pounds = 6.35 kg. It is commonly used in the UK and Ireland for reporting body weight and is rarely seen in the US or Canada. For reference: 10 stone = 140 lbs = 63.5 kg; 12 stone = 168 lbs = 76.2 kg. The unit originated from a literal stone used as a counterweight on balance scales, before standard weights were formalized.

The US uses ounces, pounds, and short tons (2,000 lbs). The metric system uses grams, kilograms, and metric tonnes (1,000 kg = 2,205 lbs). The UK officially uses metric for scientific and commercial purposes but still uses stone and pounds informally for body weight. International shipping and trade are almost entirely metric, so knowing the conversion factor is practically useful.