Kilograms To Milligrams Conversion (kg To Mg) - Inch Calculator

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• Kilograms to Milligrams Converter
• How to Convert Kilograms to Milligrams
• How Many Milligrams Are in a Kilogram?
• What Is a Kilogram?
• What Is a Milligram?
• Kilogram to Milligram Conversion Table
• References

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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.). Kilograms to Milligrams Converter. Inch Calculator. Retrieved December 9, 2025, from https://www.inchcalculator.com/convert/kilogram-to-milligram/

How to Convert Kilograms to Milligrams

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

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

milligrams = kilograms × 1,000,000

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

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

milligrams = (5 kg × 1,000,000) = 5,000,000 mg

How Many Milligrams Are in a Kilogram?

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

1 kg = 1,000,000 mg

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

What Is a Kilogram?

One kilogram is equal to 1,000 grams, 2.204623 pounds, or 1/1,000 of a metric ton.

The formal definition of the kilogram changed in 2019. One kilogram was previously equal to the mass of the platinum-iridium bar, known as the International Prototype of the Kilogram, which was stored in Sèvres, France.

The 2019 SI brochure now defines the kilogram using the Planck constant, and it is defined using the meter and second.[1] It is equal to the mass of 1,000 cubic centimeters, or milliliters, of water.

The kilogram, or kilogramme, is the SI base unit for weight and is also a multiple of the gram. In the metric system, "kilo" is the prefix for thousands, or 103. Kilograms can be abbreviated as kg; for example, 1 kilogram can be written as 1 kg.

Learn more about kilograms.

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.

Kilogram to Milligram Conversion Table

Table showing various kilogram measurements converted to milligrams.

Kilograms	Milligrams
0.000001 kg	1 mg
0.000002 kg	2 mg
0.000003 kg	3 mg
0.000004 kg	4 mg
0.000005 kg	5 mg
0.000006 kg	6 mg
0.000007 kg	7 mg
0.000008 kg	8 mg
0.000009 kg	9 mg
0.0000001 kg	0.1 mg
0.000001 kg	1 mg
0.00001 kg	10 mg
0.0001 kg	100 mg
0.001 kg	1,000 mg
0.01 kg	10,000 mg
0.1 kg	100,000 mg
1 kg	1,000,000 mg

References

1. International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf

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