📏 Grams to Milligrams Converter
Convert grams (g) to milligrams (mg) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 gram (g) = 1,000 milligrams (mg). Formula: mg = g × 1,000.
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Grams to Milligrams Converter inputs
Result
Grams to Milligrams conversion table
| Grams (g) | Milligrams (mg) |
|---|---|
| 0.1 g | 100 mg |
| 0.5 g | 500 mg |
| 1 g | 1,000 mg |
| 2 g | 2,000 mg |
| 3 g | 3,000 mg |
| 5 g | 5,000 mg |
| 10 g | 10,000 mg |
| 20 g | 20,000 mg |
| 25 g | 25,000 mg |
| 50 g | 50,000 mg |
| 100 g | 100,000 mg |
| 1,000 g | 1,000,000 mg |
Other weight conversions
How to convert grams to milligrams
Multiply the number of grams by 1,000 to get milligrams: mg = g × 1,000.
Example: 5 g = 5,000 mg.
The gram (g) and the milligram (mg) are both units of weight. Need the opposite direction? Use the mg to g converter.
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many milligrams are in a gram?
1 gram = 1,000 milligrams.
How do I convert grams to milligrams?
Use the formula mg = g × 1,000. For example, 5 g = 5,000 mg.
How do I convert milligrams back to grams?
1 milligram = 0.001 grams. Use the mg to g converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.