Convert weight and mass units — kilograms, pounds, ounces, grams, tons, stones.
| Unit | Name | Value |
|---|---|---|
| kg | Kilogram | 0.001 |
| mg | Milligram | 1000 |
| t | Metric Ton | 0.000001 |
| lb | Pound | 0.0022046244 |
| oz | Ounce | 0.035273991 |
| st | Stone | 0.00015747312 |
The Gram (g) and the Milligram (mg) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 g = 1000 mg
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Gram (g) | Milligram (mg) | Real-world context |
|---|---|---|
| 0.001 g | 1 mg | |
| 0.01 g | 10 mg | |
| 0.1 g | 100 mg | |
| 1 g | 1000 mg | large paperclip |
| 10 g | 10000 mg |
1 gram (g) equals exactly 1000 milligrams (mg). Use the formula: g × 1000 = mg.
To convert grams to milligrams, multiply your value in grams by 1000. For example, 5 g × 1000 = 5000 mg.
100 grams = 100000 milligrams. Calculation: 100 × 1000 = 100000.
To convert milligrams back to grams, divide by 1000 (or multiply by 0.001). Example: 10 mg ÷ 1000 = 0.01 g.
Yes. This converter uses the internationally recognised exact conversion factor: 1 g = 1000 mg. All calculations are performed in your browser with no rounding until display.
10 grams = 10000 milligrams. Simply multiply by 1000.
Converting grams to milligrams is commonly needed for medical dosing, laboratory measurements, pharmaceutical calculations, and quality control testing where one system uses g and another uses mg.
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.
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.
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.
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.