Carat to Gram Converter
Weight · unit-converter
Convert Carat to Gram 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: Carat (ct)
To: Gram (g)
About Carat
The metric carat is exactly 0.2 grams (200 mg), commonly used for gemstones and jewelry.
About Gram
The gram is one thousandth of a kilogram. Recipes, lab work, and small masses typically use grams.
How to convert carats to grams
1 carat is equal to 0.2 gram:
1 ct = (0.2 g ÷ 1 g) g = 0.2 g
1 carat = 0.2 grams exactly (200 mg).
Each carat is defined as 0.2 g and each gram as 1 g, so one ct equals 0.2 ÷ 1 g = 0.2 g.
Let w(ct) be the numeric value of the same mass measured in Carat (ct), and w(g) the value in Gram (g). Then:
w(g) = w(ct) × (0.2 / 1)
Equivalently, divide by how many ct fit into one g (grams per g divided by grams per ct):
w(g) = w(ct) ÷ 5
Or: gram = carat ÷ 5
Examples
Example #1: Convert 20 ct to gram
20 ct = 20 ct × (0.2/1) g = 4 g
20 ct = 20 ct ÷ 5 = 4 g
Example #2: Convert 50 ct to gram
50 ct = 50 ct × (0.2/1) g = 10 g
50 ct = 50 ct ÷ 5 = 10 g
Summary
To convert Carat to Gram, multiply the value in ct by the ratio of grams per ct divided by grams per g. Equivalently: value_g = value_ct × (0.2 / 1). Numerically, 1 ct equals 0.2 g.
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 Carat to Gram is 2.000000e-1 (1 ct = 0.2 g).
Conversion tables
| Carat (ct) | Gram (g) |
|---|---|
| 0.1 | 0.02 |
| 1 | 0.2 |
| 2 | 0.4 |
| 3 | 0.6 |
| 4 | 0.8 |
| 5 | 1 |
| 6 | 1.2 |
| 7 | 1.4 |
| 8 | 1.6 |
| 9 | 1.8 |
| Carat (ct) | Gram (g) |
|---|---|
| 10 | 2 |
| 20 | 4 |
| 30 | 6 |
| 40 | 8 |
| 50 | 10 |
| 60 | 12 |
| 70 | 14 |
| 80 | 16 |
| 90 | 18 |
| 100 | 20 |