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Convert mg to kg, kg to mg - Weight/Mass Conversion

Use these online calculators to convert between milligrams (mg) and kilograms (kg). These Weight/Mass conversion calculators provide a quick and easy way to convert:

  • milligrams to kilograms (mg to kg)
  • kilograms to milligrams (kg to mg)

Conversion Calculators

Enter your value in one of the conversion calculators below to convert mg to kg or convert kg to mg.

Convert mg to kg

Convert kg to mg

How to convert mg to kg: Use the conversion calculator on the left titled "Convert mg to kg". Enter a value in the mg field and click on the "Calculate kg" button. Your answer will appear in the kg field.

How to convert kg to mg: Use the conversion calculator on the right titled "Convert kg to mg". Enter a value in the kg field and click on the "Calculate mg" button. Your answer will appear in the mg field.

Conversion Definitions

Below are definitions relating to these conversion formulas.

What is a milligram (mg)?

A milligram is a unit of mass in the Metric System. The symbol for milligram is mg. There are 1,000 milligrams in a gram.

What is a kilogram (kg)?

A kilogram is a unit of mass in the Metric System. The symbol for kilogram is kg. There are 1,000 grams in a kilogram.

How many milligrams in a kilogram?

There are 1,000,000 milligrams in a kilogram.

How many kilograms in a milligram?

There are 0.000001 kilograms in a milligram.

Understanding the Weight/Mass Units

This table provides a summary of the Weight/Mass units within their respective measurement systems.

Unit Symbol Measurement System Description
ounces oz US Customary Units (and Imperial)  
pounds lbs or lb US Customary Units (and Imperial) 1 lb = 16 oz
stones st Imperial System 1 stone = 14 lbs
short tons T US Customary Units 1 short ton = 2000 lbs
long tons long tn Imperial System 1 long ton = 2240 lbs
micrograms mcg or μg Metric System 1,000,000 mcg = 1 g
milligrams mg Metric System 1000 mg = 1 g
centigrams cg Metric System 100 cg = 1 g, 1 cg = 10 mg
decigrams dg Metric System 10 dg = 1 g, 1 dg = 10 cg
grams g Metric System 1 g = 1000 mg or 100 cg or 10 dg
kilograms kg Metric System 1 kg = 1000 g
metric tons t Metric System 1 metric ton = 1000 kg