Direct conversion
Convert gram [g] to milligram [mg] instantly with formula, examples, chart, and FAQs.
1 gram [g] = 1000 milligram [mg]
1 gram [g] = 1000 milligram [mg]
Example: 1 gram [g] equals 1000 milligram [mg].
Weight and mass conversions use kilogram as the reference unit. Common factors include 1 pound = 0.45359237 kilogram and 1 ounce = 0.028349523125 kilogram.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
The gram is a metric mass unit equal to one thousandth of a kilogram.
HistoryGrams are part of the metric system and became common for small everyday weights.
Current useGrams are used for food, nutrition, recipes, lab samples, postage, jewelry, and product labels.
The milligram (mg) is a weight unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse milligram when comparing weight values, checking specifications, converting between systems, or preparing quick estimates.
| gram [g] | milligram [mg] |
|---|---|
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 20 | 20000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
| 1000 | 1000000 |
Use this formula: 1 gram [g] = 1000 milligram [mg] Enter your value in the calculator and the result updates instantly.
1 gram [g] equals 1000 milligram [mg].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.