How to convert milligram to gram
Multiply the milligram value by 0.001. The converter uses a fixed unit ratio, so the same formula applies to positive, negative and decimal values.
1 mg = 0.001 g. In the other direction, 1 g = 1000 mg.
Milligram to Gram Converter
Convert milligram (mg) to gram (g) instantly with a free browser-based mass converter.
Free to useNo account requiredRuns in your browser
0.001 g
1 mg = 0.001 g
The calculation happens locally in your browser.
Assumptions & limitations
This is a mass conversion between standardized unit definitions. Very large or very small numbers may be shown in scientific notation because browser calculations use floating-point arithmetic.
No input is sent to this website by the converter. For regulated engineering, laboratory, billing or legal work, verify the required standard and rounding rules for your use case.
Common questions
What is the conversion factor?
One milligram equals 0.001 gram.
Can I enter decimals?
Yes. The input accepts decimal and negative values as well as whole numbers.
Does the tool upload my value?
No. The calculation is performed in your browser.
Keep converting
Browse the converter directory for other mass and digital unit conversions.