ConvBolt — Unit ConverterGrams to Milligrams Converter
Converting grams to milligrams is a multiplication by a fixed factor: 1 g = 1000 mg. The table below covers the values people look up most often, and the formula section shows exactly where that factor comes from.
Because one gram works out to 1000 mg, the milligram is the much larger unit of the two: a figure given in milligram always carries a larger number than the same measurement in gram. A chart drawn in g can hide that, so check which label the axis uses before you compare two readings.
Cooking and shipping are the two places this pair appears most: a kitchen scale reads in grams while a recipe or label is written in milligrams, and a courier tariff built on milligrams still has to be checked against a scale showing grams.
The conversion factor used here is 1000 mg per gram (0 significant digits as shown). Kept to seven figures it covers professional measurement; if you round it to two or three decimals for a spreadsheet, the error scales with the input — at a value of 1,000 g a factor rounded to three decimals can be off by a measurable amount. The reverse direction uses 0.001 g per mg, the exact reciprocal, so a round trip through both pages returns your original number.
Grams to Milligrams formula
Use this formula to convert any gram value to milligrams:
Worked example: 100 g × 1000 = 100000 mg.
Grams to Milligrams conversion table
| Grams (g) | Milligrams (mg) |
|---|---|
| 0.5 g | 500 mg |
| 1 g | 1000 mg |
| 2 g | 2000 mg |
| 5 g | 5000 mg |
| 10 g | 10000 mg |
| 20 g | 20000 mg |
| 50 g | 50000 mg |
| 100 g | 100000 mg |
| 500 g | 500000 mg |
| 1000 g | 1000000 mg |
How to convert grams to milligrams
Multiply the gram value by 1000 to get the equivalent in milligrams. This single factor works for every value in the table above and for anything else you need — there is no per-value adjustment, which is why a conversion table and a calculator always agree.
If you need the opposite direction, use the Milligrams to Grams converter instead of dividing by hand; both pages use the same source factors. For every other g conversion in one place, see the g conversion hub.
Frequently asked questions
How many milligrams are in 1 gram?
1 gram = 1000 mg.
What is 100 grams in milligrams?
100 g = 100000 mg.
Is converting grams to milligrams the same as milligrams to grams?
No — the direction changes the multiplier. The reverse conversion (1 mg = 0.001 g) is on the Milligrams to Grams page.
Related conversions
Try the ConvBolt Unit Converter for any other weight unit, browse the Weight conversions, or read our conversion guides.