Carats to Milligrams Converter
Convert carats (ct) to milligrams (mg), with the formula, a conversion table and exact factors.
Change the values and press Calculate to work out your own figures.
Enter a weight, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.
Show the working
- 1 ct = 200 mg
- 1 × 200 = 200 mg
How to convert carats to milligrams
1 ct = 200 mg, so multiply by 200 to go from carats to milligrams. Going the other way, 1 mg = 0.005 ct.
mg = ct × 200 ct = mg × 0.005
Worked example:
1 ct = 200 mg 5 × 200 = 1000 mg
Carats to milligrams table
| Carats | Milligrams |
|---|---|
| 1 ct | 200 mg |
| 2 ct | 400 mg |
| 3 ct | 600 mg |
| 4 ct | 800 mg |
| 5 ct | 1,000 mg |
| 6 ct | 1,200 mg |
| 7 ct | 1,400 mg |
| 8 ct | 1,600 mg |
| 9 ct | 1,800 mg |
| 10 ct | 2,000 mg |
| 15 ct | 3,000 mg |
| 20 ct | 4,000 mg |
| 25 ct | 5,000 mg |
| 30 ct | 6,000 mg |
| 40 ct | 8,000 mg |
| 50 ct | 10,000 mg |
| 75 ct | 15,000 mg |
| 100 ct | 20,000 mg |
| 250 ct | 50,000 mg |
| 500 ct | 100,000 mg |
| 1000 ct | 200,000 mg |
About the units
- Carats (ct)
- Carats, a specialised unit. Metric carat, 200 mg exactly. Definition: NIST Handbook 44 (2024), Appendix C: General Tables of Units of Measurement.
- Milligrams (mg)
- Milligrams, a metric unit. Definition: BIPM SI Brochure.