Gram to Milligram Converter
Convert Gram (g) to Milligram (mg) instantly. 1 g = 1,000 mg.
Mass Converter
26 units available
1 g = 1,000 mg
Formula:
mg = g × 1,000With your value: 1 g = 1,000 mg
How big is that?
Everyday references on a logarithmic scale, all expressed in gram so you can sanity-check the result.
Other Gram to Milligram conversions
Gram to Milligram Conversion Table
| Gram (g) | Milligram (mg) |
|---|---|
| 0.5 | 500 |
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1000 | 1,000,000 |
Milligram to Gram Conversion Table
| Milligram (mg) | Gram (g) |
|---|---|
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1000 | 1 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Gram (g)
Mass
Traceable to the kilogram, defined by fixing the Planck constant at 6.626 070 15 × 10⁻³⁴ J·s. Avoirdupois masses derive from the 1959 international pound (0.453 592 37 kg exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Milligram (mg)
Mass
Traceable to the kilogram, defined by fixing the Planck constant at 6.626 070 15 × 10⁻³⁴ J·s. Avoirdupois masses derive from the 1959 international pound (0.453 592 37 kg exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
How to Convert Gram to Milligram
To convert from Gram (g) to Milligram (mg), multiply the value by 1,000.
Formula: mg = g × 1,000
Reverse: g = mg × 0.001
Step-by-Step Example
- Start with your value in Gram. For example: 5 g
- Multiply by the conversion factor: 5 x 1,000
- The result is: 5,000 mg
About Gram
The gram equals one thousandth of a kilogram. It is commonly used for measuring food, ingredients, and small items.
Common uses: cooking, nutrition labels, jewelry.
About Milligram
The milligram equals one thousandth of a gram and is the standard unit for drug dosage and nutrient quantities.
Common uses: medication dosage, nutrition labels, laboratory work.
Frequently Asked Questions
How many Milligram are in 1 Gram?
There are exactly 1,000 Milligram in 1 Gram. This means the conversion factor from Gram to Milligram is 1,000.
What is the formula to convert Gram to Milligram?
The formula to convert Gram to Milligram is: mg = g × 1,000. For example, to convert 10 Gram to Milligram, you would multiply 10 by 1,000.
What is a Gram?
The gram equals one thousandth of a kilogram. It is commonly used for measuring food, ingredients, and small items.
What is a Milligram?
The milligram equals one thousandth of a gram and is the standard unit for drug dosage and nutrient quantities.
What are the common uses of Gram?
The Gram is commonly used in cooking, nutrition labels, jewelry.
Related Mass Conversions
Cite this page
UnitConvertLab. (2026). Gram to Milligram converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/gram-to-milligram