Convert weight and mass units — kilograms, pounds, ounces, grams, tons, stones.
| Unit | Name | Value |
|---|---|---|
| kg | Kilogram | 0.000001 |
| g | Gram | 0.001 |
| t | Metric Ton | 1.000000e-9 |
| lb | Pound | 0.0000022046244 |
| oz | Ounce | 0.000035273991 |
| st | Stone | 1.5747312e-7 |
The Milligram (mg) and the Gram (g) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 mg = 0.001 g
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Milligram (mg) | Gram (g) | Real-world context |
|---|---|---|
| 1 mg | 0.001 g | |
| 100 mg | 0.1 g | aspirin tablet (low dose) |
| 1000 mg | 1 g | 1 gram |
| 10000 mg | 10 g | |
| 100000 mg | 100 g |
1 milligram (mg) equals exactly 0.001 grams (g). Use the formula: mg × 0.001 = g.
To convert milligrams to grams, multiply your value in milligrams by 0.001. For example, 5 mg × 0.001 = 0.005 g.
100 milligrams = 0.1 grams. Calculation: 100 × 0.001 = 0.1.
To convert grams back to milligrams, divide by 0.001 (or multiply by 1000). Example: 10 g ÷ 0.001 = 10000 mg.
Yes. This converter uses the internationally recognised exact conversion factor: 1 mg = 0.001 g. All calculations are performed in your browser with no rounding until display.
10 milligrams = 0.01 grams. Simply multiply by 0.001.
Converting milligrams to grams is commonly needed for medical dosing, laboratory measurements, pharmaceutical calculations, and quality control testing where one system uses mg and another uses g.
The milligram (mg) is a unit of mass equal to one-thousandth of a gram (0.001 g) or one-millionth of a kilogram (10⁻⁶ kg). It is the standard unit for drug dosing in medicine and pharmacology, where precise small quantities are critical for safety and efficacy. The prefix "milli-" comes from Latin mille meaning one thousand.
The gram (g) is a unit of mass in the metric system equal to one-thousandth of a kilogram (0.001 kg). While the kilogram is the SI base unit, the gram is the practical everyday unit for small masses in cooking, pharmacy, chemistry, and nutrition labelling. The word derives from Late Latin gramma (small weight), itself from Greek.
Established as a derived unit when the metric system was formalised in the late 18th century. The milligram rose to critical importance with the growth of pharmacology in the 19th and 20th centuries, as chemists isolated active compounds and found that tiny quantities produced strong therapeutic — or toxic — effects. Modern pharmacopoeias worldwide specify drug doses in milligrams.
Interesting fact: A single grain of table salt weighs about 58 mg. One standard 325 mg aspirin tablet means that 1,000 tablets weigh only 325 grams — less than a can of soft drink.
Defined in 1795 by the French Academy of Sciences as the mass of one cubic centimetre of pure water at 4 °C — this made 1 mL of water weigh almost exactly 1 gram. The gram was the practical base of early metric calculations before the kilogram took over as SI base unit in 1875. The relationship 1 mL water ≈ 1 g is still a useful approximation in cooking and chemistry.
Interesting fact: A standard large paperclip weighs about 1 gram. The gram forms the basis for milligram (mg), microgram (μg), and tonne (10⁶ g) through SI prefixes.