MG to Grams Converter
Convert milligram to gram instantly. 1 mg = 0.001 g, worked steps and a full reference table.
How to use it
- Type the value in milligram — 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 mg | 0.001 g |
| 5 mg | 0.005 g |
| 10 mg | 0.01 g |
| 100 mg | 0.1 g |
One milligram equals 0.001 grams (g). To convert milligrams to grams, multiply by 0.001; to go back the other way, multiply by 1000 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 milligrams and grams actually measure
Milligram (mg) — A milligram is a thousandth of a gram. Medication doses, vitamins and analytical chemistry.
Gram (g) — A gram is a thousandth of a kilogram. Cooking, postage, nutrition labels and jewellery.
MG to Grams conversion table
The most common values, worked out in advance. Anything not listed can be typed straight into the converter.
| mg | g |
|---|---|
| 1 mg | 0.001 g |
| 2 mg | 0.002 g |
| 5 mg | 0.005 g |
| 10 mg | 0.01 g |
| 25 mg | 0.025 g |
| 50 mg | 0.05 g |
| 100 mg | 0.1 g |
How to convert milligrams to grams by hand
Multiply the number of milligrams by 0.001.
For example, 25 mg × 0.001 = 0.025 g.
Going the other way, divide by 0.001 — or multiply by 1000, 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 g are in 1 mg?
1 mg equals exactly 0.001 g. Multiply any value in milligram by 0.001 to get gram.
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.
Last updated 18 August 2026