Grams to milligrams
Multiply grams by 1,000 to get milligrams.
10 g = 10,000 mg
How to convert grams to milligrams
The milligram is one thousandth of a gram (10⁻⁶ kg). The gram is one thousandth of a kilogram (10⁻³ kg) in the SI.
Worked example — 10 g: 10 × 1,000 = 10,000 mg.
Grams to milligrams table
| Grams | Milligrams |
|---|---|
| 0.5 g | 500 mg |
| 1 g | 1,000 mg |
| 2 g | 2,000 mg |
| 5 g | 5,000 mg |
| 10 g | 10,000 mg |
| 25 g | 25,000 mg |
| 50 g | 50,000 mg |
| 100 g | 100,000 mg |
| 500 g | 500,000 mg |
Reverse and related
About grams and milligrams
Gram (g)
1 g = 1,000 mgDefinition. One thousandth of a kilogram (10⁻³ kg) in the SI
History and origin
The gram was the original base of the metric system set out in 1795, defined as the mass of one cubic centimetre of water at the melting point of ice, before the larger kilogram was chosen as the SI base unit. It is now simply one thousandth of a kilogram.
Current use
Grams are the everyday metric unit for small masses: recipe ingredients, nutrition labels, medicine doses and postage.
Source: BIPM, The International System of Units (SI), 9th ed. (2019)
Milligram (mg)
1 mg = 0.001 gDefinition. One thousandth of a gram (10⁻⁶ kg)
History and origin
The milligram is one thousandth of a gram, part of the decimal metric system. Its small size suits doses and trace amounts.
Current use
Milligrams are the everyday unit for medication doses and for nutrients on food labels.
Source: BIPM, The International System of Units (SI), 9th ed. (2019)
Where people use this
Grams: recipe and food weights, nutrition labels, postage. Milligrams: medication doses, nutrition labels. 1 gram is exactly 1000 mg.
Every value is carried to full double precision; the display is rounded.
Both units are defined in BIPM, The International System of Units (SI), 9th ed. (2019).
Questions people ask
How many mg in a gram?
One gram is exactly 1000 milligrams. To convert grams to milligrams, multiply by 1000.
How many mg is 5 grams?
5 grams is 5000 mg.
How many mg is 0.5 grams?
Half a gram is 500 mg.