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There are no millimeters in a milligram. There can't be. Millimeters are units of LENGTH: a millimeter is one-thousandth of a meter (a meter measures a bit more than 39 inches). Milligrams, on the other hand, are units of MASS (more usually, they are called units of WEIGHT). One thousand milligrams equal one gram. About 454 grams equal one pound weight. Obviously, since milligrams and millimeters measure different things (weight and length respectively), they can't be expressed in terms of each other. You might as well ask "how many cupfuls in a mile", or "how many inches in a ton". Millimeters and milligrams are units in the SI system of measurement, which developed from the metric system. The SI system is used in most countries of the world. In some countries (the USA is one) units from much older systems are used: inches, pounds, gallons, etc.

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16y ago

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