---
title: "Carats to Milligrams — ct to mg converter"
description: "1 carat = 200 milligrams. Convert carats to milligrams with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/carats-to-mg/
site: "At One Place"
---

# Carats to milligrams

**1 carat in milligrams: 1 ct = 200 mg**

mg = ct × 200

To convert carats to milligrams, multiply by 200. The table below gives the values people look up most often, and the converter works for any number.

## Carats to milligrams table

*Common carat values converted to milligrams.*

| Carats | Milligrams |
| --- | --- |
| 1 ct | 200 |
| 2 ct | 400 |
| 3 ct | 600 |
| 4 ct | 800 |
| 5 ct | 1,000 |
| 10 ct | 2,000 |
| 15 ct | 3,000 |
| 20 ct | 4,000 |
| 25 ct | 5,000 |
| 30 ct | 6,000 |
| 40 ct | 8,000 |
| 50 ct | 10,000 |
| 75 ct | 15,000 |
| 100 ct | 20,000 |
| 250 ct | 50,000 |
| 500 ct | 100,000 |
| 1,000 ct | 200,000 |

## How the conversion works

The relationship is mg = ct × 200. Both units measure mass, so the conversion is a fixed factor that never changes.

## Common questions

### How many milligrams are in one carat?

One carat equals 200 milligrams. mg = ct × 200.

### How do you convert carats to milligrams?

Use mg = ct × 200. So 10 ct is 2,000 mg.

### How many carats are in one milligram?

One milligram equals 0.005 carats, which is the reverse of the conversion above.

## Related pages

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