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The gram is a unit of mass in the International System of Units (SI). It is equal to the mass of one cubic centimeter of pure water at the temperature of maximum density (approximately 4 °C). It is often used in daily life, for example to measure the mass of food or other consumer goods.
The milligram is a unit of mass that is equal to one thousandth of a gram. This unit is often used in scientific contexts, such as chemistry and medicine, where small masses need to be measured. Examples are the mass of chemical substances or the dosage of drugs.
There is a simple ratio between gram and milligram: 1 gram is equal to 1000 milligrams. This makes it relatively easy to convert between these two units.
1 gram = 1000 milligrams
1 milligram = 0.001 grams
For example, if you have an object that weighs 2 grams, that would be the same as 2000 milligrams. Conversely, if you have an object that weighs 1500 milligrams, that would be the same as 1.5 grams.