Grams To Milligrams Conversion (g To Mg) - Inch Calculator

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• Grams to Milligrams Converter
• How to Convert Grams to Milligrams
• How Many Milligrams Are in a Gram?
• What Is a Gram?
• What Is a Milligram?
• Gram to Milligram Conversion Table

Person Icon By Joe Sexton

Joe is the creator of Inch Calculator and has over 20 years of experience in engineering and construction. He holds several degrees and certifications.

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Sexton, J. (n.d.). Grams to Milligrams Converter. Inch Calculator. Retrieved December 9, 2025, from https://www.inchcalculator.com/convert/gram-to-milligram/

How to Convert Grams to Milligrams

To convert a measurement in grams to a measurement in milligrams, multiply the weight by the following conversion ratio: 1,000 milligrams/gram.

Since one gram is equal to 1,000 milligrams, you can use this simple formula to convert:

milligrams = grams × 1,000

The weight in milligrams is equal to the weight in grams multiplied by 1,000.

For example, here's how to convert 5 grams to milligrams using the formula above.

milligrams = (5 g × 1,000) = 5,000 mg

How Many Milligrams Are in a Gram?

There are 1,000 milligrams in a gram, which is why we use this value in the formula above.

1 g = 1,000 mg

Grams and milligrams are both units used to measure weight. Keep reading to learn more about each unit of measure.

What Is a Gram?

A gram is a unit of mass equal to 1/1,000 of a kilogram or 0.035274 ounces, and is equivalent to the mass of one cubic centimeter, or one milliliter, of water.

The gram, or gramme, is an SI unit of weight in the metric system. Grams can be abbreviated as g; for example, 1 gram can be written as 1 g.

Learn more about grams.

What Is a Milligram?

The milligram is a unit of mass equal to 1/1,000 of a gram, or 0.0154 grains.

The milligram, or milligramme, is an SI unit of weight in the metric system. In the metric system, "milli" is the prefix for thousandths, or 10-3. Milligrams can be abbreviated as mg; for example, 1 milligram can be written as 1 mg.

Learn more about milligrams.

Gram to Milligram Conversion Table

Table showing various gram measurements converted to milligrams.

Grams	Milligrams
0.001 g	1 mg
0.002 g	2 mg
0.003 g	3 mg
0.004 g	4 mg
0.005 g	5 mg
0.006 g	6 mg
0.007 g	7 mg
0.008 g	8 mg
0.009 g	9 mg
0.01 g	10 mg
0.02 g	20 mg
0.03 g	30 mg
0.04 g	40 mg
0.05 g	50 mg
0.06 g	60 mg
0.07 g	70 mg
0.08 g	80 mg
0.09 g	90 mg
0.1 g	100 mg
0.2 g	200 mg
0.3 g	300 mg
0.4 g	400 mg
0.5 g	500 mg
0.6 g	600 mg
0.7 g	700 mg
0.8 g	800 mg
0.9 g	900 mg
1 g	1,000 mg

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