---
title: "Grams to Milligrams — g to mg converter"
description: "1 gram = 1,000 milligrams. Convert grams to milligrams with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/grams-to-mg/
site: "At One Place"
---

# Grams to milligrams

**1 gram in milligrams: 1 g = 1,000 mg**

mg = g × 1,000

To convert grams to milligrams, multiply by 1,000. The table below gives the values people look up most often, and the converter works for any number.

## Grams to milligrams table

*Common gram values converted to milligrams.*

| Grams | Milligrams |
| --- | --- |
| 1 g | 1,000 |
| 2 g | 2,000 |
| 3 g | 3,000 |
| 4 g | 4,000 |
| 5 g | 5,000 |
| 10 g | 10,000 |
| 15 g | 15,000 |
| 20 g | 20,000 |
| 25 g | 25,000 |
| 30 g | 30,000 |
| 40 g | 40,000 |
| 50 g | 50,000 |
| 75 g | 75,000 |
| 100 g | 100,000 |
| 250 g | 250,000 |
| 500 g | 500,000 |
| 1,000 g | 1,000,000 |

## How the conversion works

The relationship is mg = g × 1,000. Both units measure mass, so the conversion is a fixed factor that never changes.

## Common questions

### How many milligrams are in one gram?

One gram equals 1,000 milligrams. mg = g × 1,000.

### How do you convert grams to milligrams?

Use mg = g × 1,000. So 10 g is 10,000 mg.

### How many grams are in one milligram?

One milligram equals 0.001 grams, which is the reverse of the conversion above.

## Related pages

- [Milligrams to Grams](https://atoneplace.net/convert/mg-to-grams/)
- [Grams to Kilograms](https://atoneplace.net/convert/grams-to-kg/)
- [Grams to Tonnes](https://atoneplace.net/convert/grams-to-tonnes/)
- [Grams to Pounds](https://atoneplace.net/convert/grams-to-lbs/)
- [Grams to Ounces](https://atoneplace.net/convert/grams-to-oz/)
- [Grams to Stone](https://atoneplace.net/convert/grams-to-stone/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)