Milligrams to Grams Converter (mg to g)
1 mg = 0.001 g, so divide milligrams by 1,000. Convert mg to g for nutrition labels, supplements and tablets, with mg to g and g to mg charts.
Gram (g) = Milligram (mg) × 0.001
Milligram (mg): A milligram is one thousandth of a gram, or one millionth of a kilogram. There are 1,000 micrograms in one milligram.
Gram (g): The gram is one thousandth of a kilogram, the SI base unit of mass. It is used worldwide for food, postage and small quantities of almost anything.
| Milligram (mg) | Gram (g) |
|---|---|
| 1 | 0.001 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
A US Nutrition Facts panel lists fat, carbohydrate, fiber and protein in grams but sodium, cholesterol, calcium, iron and potassium in milligrams, and medicine and supplement labels state their strengths in milligrams too. Converting to grams lets you add those figures together or set them beside nutrients already given in grams.
The milli- prefix means one thousandth, so 1,000 mg is exactly 1 g and the conversion only moves the decimal point. The charts run from single milligrams through tablet strengths to the large daily figures, such as the 2,300 mg Daily Value for sodium.
How to use this tool
- Type a value in the Milligram box to see it in grams, or type in the Gram box to convert the other way.
- Press ⇄ to swap the two units, or Load example for a typical value.
- Check the charts below for common values; for other units, open the Weight & Mass converter.
Formula
Gram (g) = Milligram (mg) × 0.001
Milligram (mg) = Gram (g) × 1000
Both factors come from exact definitions: 1 gram = 1000 milligrams and 1 milligram = 0.001 grams (shown to 12 significant digits).
Example
Two conversions worked with the same factors the converter uses:
2300 mg × 0.001 = 2.3 g
1.5 g × 1000 = 1500 mg
Milligram to Gram chart
Common values from milligrams to grams, rounded to four decimal places.
| Milligram (mg) | Gram (g) |
|---|---|
| 1 | 0.001 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 81 | 0.081 |
| 100 | 0.1 |
| 200 | 0.2 |
| 250 | 0.25 |
| 325 | 0.325 |
| 400 | 0.4 |
| 500 | 0.5 |
| 650 | 0.65 |
| 750 | 0.75 |
| 1,000 | 1 |
| 1,300 | 1.3 |
| 1,500 | 1.5 |
| 2,000 | 2 |
| 2,300 | 2.3 |
| 2,500 | 2.5 |
| 3,000 | 3 |
| 4,700 | 4.7 |
| 5,000 | 5 |
| 10,000 | 10 |
Gram to Milligram chart
The reverse direction for values people often look up.
| Gram (g) | Milligram (mg) |
|---|---|
| 0.001 | 1 |
| 0.01 | 10 |
| 0.05 | 50 |
| 0.1 | 100 |
| 0.2 | 200 |
| 0.25 | 250 |
| 0.5 | 500 |
| 1 | 1,000 |
| 2 | 2,000 |
| 2.5 | 2,500 |
| 5 | 5,000 |
| 10 | 10,000 |
Milligram amounts on US labels
| Item | Milligram (mg) | Gram (g) |
|---|---|---|
| Low-dose aspirin tablet | 81 | 0.081 |
| Ibuprofen tablet, standard OTC strength | 200 | 0.2 |
| Regular-strength aspirin tablet | 325 | 0.325 |
| FDA's daily caffeine figure for healthy adults | 400 | 0.4 |
| Extra-strength acetaminophen tablet | 500 | 0.5 |
| Daily Value for calcium | 1,300 | 1.3 |
| Daily Value for sodium | 2,300 | 2.3 |
| Daily Value for potassium | 4,700 | 4.7 |
Quick mental estimate
Move the decimal point three places to the left: 2,300 mg → 2.3 g, and 81 mg → 0.081 g. The prefixes are exact powers of ten, so the only possible error is moving the point the wrong way.
Use the converter or the charts when the exact figure matters.
The two units
Milligram (mg): A milligram is one thousandth of a gram, or one millionth of a kilogram. There are 1,000 micrograms in one milligram.
Gram (g): The gram is one thousandth of a kilogram, the SI base unit of mass. It is used worldwide for food, postage and small quantities of almost anything.
Frequently asked questions
Is 1,000 mg the same as 1 g?
Yes, exactly. A 1,000 mg vitamin C tablet holds 1 g of vitamin C, and a 500 mg tablet holds half a gram. In the other direction, 0.25 g is 250 mg.
Why do nutrition labels mix milligrams and grams?
Nutrients eaten in large amounts, such as carbohydrate or protein, read best in grams, while sodium, cholesterol and most minerals are eaten in much smaller amounts and read best in milligrams. Writing sodium as 0.48 g instead of 480 mg would make small differences harder to spot. US labeling rules set which unit each line uses.
Is a milligram the same as a milliliter?
No. Milligrams measure mass and milliliters measure volume. A milliliter of water weighs about 1 g, which is 1,000 mg, and liquid medicines state their strength per volume, for example 160 mg per 5 mL in US children's acetaminophen.
How precise is the result?
The converter uses the exact definitions above with browser floating-point arithmetic and shows up to 12 significant digits. The charts round to four decimal places for reading.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/milligram-to-gram-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). Milligrams to Grams Converter (mg to g). https://kakao.mobile/tools/milligram-to-gram-converter/
“Milligrams to Grams Converter (mg to g).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/milligram-to-gram-converter/.
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