Grams to MG Converter
Convert gram to milligram instantly. 1 g = 1000 mg, worked steps and a full reference table.
How to use it
- Type the value in gram — the result updates as you type.
- Use Swap to flip the direction, or change either dropdown to convert between any two units.
- Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.
Examples
| 1 g | 1000 mg |
| 5 g | 5000 mg |
| 10 g | 10000 mg |
| 100 g | 100000 mg |
One gram equals 1000 milligrams (mg). To convert grams to milligrams, multiply by 1000; to go back the other way, multiply by 0.001 instead.
The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.
What grams and milligrams actually measure
Gram (g) — A gram is a thousandth of a kilogram. Cooking, postage, nutrition labels and jewellery.
Milligram (mg) — A milligram is a thousandth of a gram. Medication doses, vitamins and analytical chemistry.
Grams to MG conversion table
The most common values, worked out in advance. Anything not listed can be typed straight into the converter.
| g | mg |
|---|---|
| 1 g | 1000 mg |
| 2 g | 2000 mg |
| 5 g | 5000 mg |
| 10 g | 10000 mg |
| 25 g | 25000 mg |
| 50 g | 50000 mg |
| 100 g | 100000 mg |
How to convert grams to milligrams by hand
Multiply the number of grams by 1000.
For example, 25 g × 1000 = 25000 mg.
Going the other way, divide by 1000 — or multiply by 0.001, which is the same thing and easier to do in your head.
Everything runs in your browser
There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.
Questions people ask
How many mg are in 1 g?
1 g equals exactly 1000 mg. Multiply any value in gram by 1000 to get milligram.
Is anything uploaded to a server?
No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.
Also searched for
People find this page looking for grams of mg.
Last updated 18 August 2026