How to convert milligrams to kilograms
To convert milligrams to kilograms, multiply by 0.000001. Weight and mass conversions matter for cooking, shipping, fitness tracking, medicine and trade.
Milligram to Kilogram conversion table
| Milligram (mg) | Kilogram (kg) |
|---|---|
| 0.1 mg | 1e-7 kg |
| 0.5 mg | 5e-7 kg |
| 1 mg | 0.000001 kg |
| 2 mg | 0.000002 kg |
| 3 mg | 0.000003 kg |
| 4 mg | 0.000004 kg |
| 5 mg | 0.000005 kg |
| 10 mg | 0.00001 kg |
| 20 mg | 0.00002 kg |
| 25 mg | 0.000025 kg |
| 50 mg | 0.00005 kg |
| 100 mg | 0.0001 kg |
| 500 mg | 0.0005 kg |
| 1,000 mg | 0.001 kg |
About the units
Milligram (mg)
A milligram is one thousandth of a gram, typically used for medication doses and nutrition labels.
Kilogram (kg)
The kilogram is the SI base unit of mass, defined through the Planck constant since 2019.
How to use this converter
- Type the number of milligrams (mg) in the input box.
- The result in kilograms appears instantly — no button needed.
- See the same value in every other weight unit just below.
- Use “Swap units” to convert kilograms back to milligrams.
When you’ll use the milligram to kilogram conversion
Converting milligrams to kilograms comes up more often than you might expect — for example when tracking body weight in a different unit, following a recipe written in grams, or checking luggage against an airline limit. Type your number once and you get the exact answer plus every related unit, so you don’t need to convert twice.
💡 The factor is exact and easy to remember: 1 mg = 0.000001 kg.
Watch out for these mix-ups
- Mixing the avoirdupois ounce with the fluid ounce (volume).
- Confusing the metric ton (1,000 kg) with the US short ton (907 kg).
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many kilograms are in one milligram?
One milligram equals 0.000001 kilograms. 0.000001 is the exact factor used by this converter.
How do I convert milligrams to kilograms?
Multiply the value in milligrams by 0.000001. To go the other way, multiply kilograms by 1,000,000.
What is 10 mg in kg?
10 mg = 0.00001 kg. Also, 5 mg = 0.000005 kg and 100 mg = 0.0001 kg.
What is the difference between a milligram and a kilogram?
A milligram is one thousandth of a gram, typically used for medication doses and nutrition labels. The kilogram is the SI base unit of mass, defined through the Planck constant since 2019.
Is this tool free and private?
Yes — the Milligram to Kilogram is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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