ConvBolt — Unit ConverterMilligrams to Kilograms Converter
Converting milligrams to kilograms is a multiplication by a fixed factor: 1 mg = 1.0000e-6 kg. The table below covers the values people look up most often, and the formula section shows exactly where that factor comes from.
Because one milligram works out to 1.0000e-6 kg, the kilogram is the far smaller unit of the two: a figure given in kilogram always carries a smaller number than the same measurement in milligram. A chart drawn in mg can hide that, so check which label the axis uses before you compare two readings.
Cooking and shipping are the two places this pair appears most: a kitchen scale reads in milligrams while a recipe or label is written in kilograms, and a courier tariff built on kilograms still has to be checked against a scale showing milligrams.
The conversion factor used here is 1.0000e-6 kg per milligram (7 significant digits as shown). Kept to seven figures it covers professional measurement; if you round it to two or three decimals for a spreadsheet, the error scales with the input — at a value of 1,000 mg a factor rounded to three decimals can be off by a measurable amount. The reverse direction uses 1000000 mg per kg, the exact reciprocal, so a round trip through both pages returns your original number.
Milligrams to Kilograms formula
Use this formula to convert any milligram value to kilograms:
Worked example: 100 mg × 1.0000e-6 = 1.0000e-4 kg.
Milligrams to Kilograms conversion table
| Milligrams (mg) | Kilograms (kg) |
|---|---|
| 0.5 mg | 5.0000e-7 kg |
| 1 mg | 1.0000e-6 kg |
| 2 mg | 2.0000e-6 kg |
| 5 mg | 5.0000e-6 kg |
| 10 mg | 1.0000e-5 kg |
| 20 mg | 2.0000e-5 kg |
| 50 mg | 5.0000e-5 kg |
| 100 mg | 1.0000e-4 kg |
| 500 mg | 0.0005 kg |
| 1000 mg | 0.001 kg |
How to convert milligrams to kilograms
Multiply the milligram value by 1.0000e-6 to get the equivalent in kilograms. This single factor works for every value in the table above and for anything else you need — there is no per-value adjustment, which is why a conversion table and a calculator always agree.
If you need the opposite direction, use the Kilograms to Milligrams converter instead of dividing by hand; both pages use the same source factors. For every other mg conversion in one place, see the mg conversion hub.
Frequently asked questions
How many kilograms are in 1 milligram?
1 milligram = 1.0000e-6 kg.
What is 100 milligrams in kilograms?
100 mg = 1.0000e-4 kg.
Is converting milligrams to kilograms the same as kilograms to milligrams?
No — the direction changes the multiplier. The reverse conversion (1 kg = 1000000 mg) is on the Kilograms to Milligrams page.
Related conversions
Try the ConvBolt Unit Converter for any other weight unit, browse the Weight conversions, or read our conversion guides.