Milligrams to grams
Multiply milligrams by 0.001 to get grams.
250 mg = 0.25 g
How to convert milligrams to grams
The gram is one thousandth of a kilogram (10⁻³ kg) in the SI. The milligram is one thousandth of a gram (10⁻⁶ kg).
Worked example — 250 mg: 250 × 0.001 = 0.25 g.
Milligrams to grams table
| Milligrams | Grams |
|---|---|
| 1 mg | 0.001 g |
| 10 mg | 0.01 g |
| 50 mg | 0.05 g |
| 100 mg | 0.1 g |
| 250 mg | 0.25 g |
| 500 mg | 0.5 g |
| 1,000 mg | 1 g |
| 2,000 mg | 2 g |
| 5,000 mg | 5 g |
Reverse and related
About milligrams and grams
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)
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)
Where people use this
Milligrams: medication doses, nutrition labels. Grams: recipe and food weights, nutrition labels, postage. 1000 mg is exactly 1 gram.
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 grams is 1000 mg?
1000 mg is exactly 1 gram. To convert milligrams to grams, divide by 1000.
How many grams is 500 mg?
500 mg is 0.5 grams.
How many mg in a gram?
One gram is 1000 milligrams.