Kg to Mg Converter
Type a value in kilograms to see it in milligrams as you type, with the exact formula and a reference chart.
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How this was calculated
- 1 kilogram = 1,000,000 milligrams
- 0.5 × 1,000,000 = 500,000 mg
| kg | mg |
|---|---|
| 0.001 kg | 1,000 mg |
| 0.005 kg | 5,000 mg |
| 0.01 kg | 10,000 mg |
| 0.05 kg | 50,000 mg |
| 0.1 kg | 100,000 mg |
| 0.25 kg | 250,000 mg |
| 0.5 kg | 500,000 mg |
| 1 kg | 1,000,000 mg |
| 2 kg | 2,000,000 mg |
| 5 kg | 5,000,000 mg |
| 10 kg | 10,000,000 mg |
| mg | kg |
|---|---|
| 1 mg | 0.000001 kg |
| 10 mg | 0.00001 kg |
| 50 mg | 0.00005 kg |
| 100 mg | 0.0001 kg |
| 250 mg | 0.00025 kg |
| 500 mg | 0.0005 kg |
| 1,000 mg | 0.001 kg |
| 5,000 mg | 0.005 kg |
| 10,000 mg | 0.01 kg |
| 100,000 mg | 0.1 kg |
| 500,000 mg | 0.5 kg |
| 1,000,000 mg | 1 kg |
How to convert kilograms to milligrams
1 kilogram = 1,000,000 milligrams. To convert kilograms to milligrams, multiply by 1,000,000. The kilogram is the SI base unit of mass, defined by the Planck constant. A milligram is one thousandth of a gram.
Worked examples
- 0.001 kilograms = 1,000 mg (0.001 × 1,000,000)
- 0.5 kilograms = 500,000 mg (0.5 × 1,000,000)
- 2 kilograms = 2,000,000 mg (2 × 1,000,000)
Where this conversion comes up
Kilograms are used for body weight, luggage and groceries outside the US; milligrams for medicine doses, vitamins, caffeine and sodium on labels. Supplement and drug doses are written in milligrams while body weight is in kilograms, so dosing per kilogram of body weight comes up often. One kilogram is exactly 1,000,000 mg (10⁶), so 0.25 kg is 250,000 mg. Moving the decimal point six places is easy to get wrong; a milligram is a thousandth of a gram.
Quick estimate
Move the decimal point six places to the right: 0.5 kg = 500,000 mg.
Common mistakes
- Dividing instead of multiplying. A milligram is smaller than a kilogram, so the number of milligrams must come out larger: 0.001 kilograms = 1,000 mg.
Going the other way? Use the mg to kg converter. Related weight converters: grams to ounces, oz to grams, oz to lbs, lbs to oz, grams to pounds, pounds to grams.
Frequently asked questions
How do you convert kilograms to milligrams?
Multiply the kilograms by 1,000,000. For example, 0.5 kilograms is 500,000 milligrams.
How many milligrams are in one kilogram?
One kilogram is 1,000,000 milligrams. The kilogram is the SI base unit of mass, defined by the Planck constant.
What is 2 kilograms in milligrams?
2 kilograms is 2,000,000 milligrams.
Is there a quick way to estimate kilograms to milligrams?
Move the decimal point six places to the right: 0.5 kg = 500,000 mg.