Milligram to Carat Converter
Weight · unit-converter
Convert Milligram to Carat with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use gram-based factors (international avoirdupois pound and metric definitions). The full Weight Converter also includes carat, grain, and US/UK hundredweight.
Calculator
From: Milligram (mg)
To: Carat (ct)
About Milligram
The milligram is one thousandth of a gram. Medication doses and fine measurements use milligrams.
About Carat
The metric carat is exactly 0.2 grams (200 mg), commonly used for gemstones and jewelry.
How to convert milligrams to carats
1 milligram is equal to 0.005 carat:
1 mg = (0.001 g ÷ 0.2 g) ct = 0.005 ct
Each milligram is defined as 0.001 g and each carat as 0.2 g, so one mg equals 0.001 ÷ 0.2 ct = 0.005 ct.
Let w(mg) be the numeric value of the same mass measured in Milligram (mg), and w(ct) the value in Carat (ct). Then:
w(ct) = w(mg) × (0.001 / 0.2)
Equivalently, divide by how many mg fit into one ct (grams per ct divided by grams per mg):
w(ct) = w(mg) ÷ 200
Or: carat = milligram ÷ 200
Examples
Example #1: Convert 20 mg to carat
20 mg = 20 mg × (0.001/0.2) ct = 0.1 ct
20 mg = 20 mg ÷ 200 = 0.1 ct
Example #2: Convert 50 mg to carat
50 mg = 50 mg × (0.001/0.2) ct = 0.25 ct
50 mg = 50 mg ÷ 200 = 0.25 ct
Summary
To convert Milligram to Carat, multiply the value in mg by the ratio of grams per mg divided by grams per ct. Equivalently: value_ct = value_mg × (0.001 / 0.2). Numerically, 1 mg equals 0.005 ct.
Relationship context
Both units are metric (SI) and tied to the gram via the kilogram. Conversions use exact ratios from their gram definitions. The factor from Milligram to Carat is 5.000000e-3 (1 mg = 0.005 ct).
Conversion tables
| Milligram (mg) | Carat (ct) |
|---|---|
| 0.1 | 0.0005 |
| 1 | 0.005 |
| 2 | 0.01 |
| 3 | 0.015 |
| 4 | 0.02 |
| 5 | 0.025 |
| 6 | 0.03 |
| 7 | 0.035 |
| 8 | 0.04 |
| 9 | 0.045 |
| Milligram (mg) | Carat (ct) |
|---|---|
| 10 | 0.05 |
| 20 | 0.1 |
| 30 | 0.15 |
| 40 | 0.2 |
| 50 | 0.25 |
| 60 | 0.3 |
| 70 | 0.35 |
| 80 | 0.4 |
| 90 | 0.45 |
| 100 | 0.5 |