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mg, g, kg, ounce, pound, stone.
The weight converter switches a mass between metric units (mg, g, kg, tonne) and imperial/US units (ounce, pound, stone), updating live as you type.
Strictly these are units of mass, not weight (force), but 'weight' is the everyday term. Each unit is defined by how many grams it equals, so conversions stay exact both ways.
Exact definitions: 1 oz = 28.349523125 g, 1 lb = 453.59237 g, 1 stone = 14 lb = 6350.29318 g.
Not exactly — mass is the amount of matter (kg), while weight is the force gravity exerts on it. On Earth the two track each other, so the terms are used interchangeably in daily life.
Exactly 453.59237 grams, which is the international definition of the avoirdupois pound.
No. The ounce here is the avoirdupois ounce (28.35 g) used for food and general goods, not the troy ounce (31.10 g) used for precious metals.