Gram to Carat Converter
Weight · unit-converter
Convert Gram 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: Gram (g)
To: Carat (ct)
About Gram
The gram is one thousandth of a kilogram. Recipes, lab work, and small masses typically use grams.
About Carat
The metric carat is exactly 0.2 grams (200 mg), commonly used for gemstones and jewelry.
How to convert grams to carats
1 gram is equal to 5 carat:
1 g = (1 g ÷ 0.2 g) ct = 5 ct
Each gram is defined as 1 g and each carat as 0.2 g, so one g equals 1 ÷ 0.2 ct = 5 ct.
Let w(g) be the numeric value of the same mass measured in Gram (g), and w(ct) the value in Carat (ct). Then:
w(ct) = w(g) × (1 / 0.2)
Equivalently, divide by how many g fit into one ct (grams per ct divided by grams per g):
w(ct) = w(g) ÷ 0.2
Or: carat = gram ÷ 0.2
Examples
Example #1: Convert 20 g to carat
20 g = 20 g × (1/0.2) ct = 100 ct
20 g = 20 g ÷ 0.2 = 100 ct
Example #2: Convert 50 g to carat
50 g = 50 g × (1/0.2) ct = 250 ct
50 g = 50 g ÷ 0.2 = 250 ct
Summary
To convert Gram to Carat, multiply the value in g by the ratio of grams per g divided by grams per ct. Equivalently: value_ct = value_g × (1 / 0.2). Numerically, 1 g equals 5 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 Gram to Carat is 5.000000e+0 (1 g = 5 ct).
Conversion tables
| Gram (g) | Carat (ct) |
|---|---|
| 0.1 | 0.5 |
| 1 | 5 |
| 2 | 10 |
| 3 | 15 |
| 4 | 20 |
| 5 | 25 |
| 6 | 30 |
| 7 | 35 |
| 8 | 40 |
| 9 | 45 |
| Gram (g) | Carat (ct) |
|---|---|
| 10 | 50 |
| 20 | 100 |
| 30 | 150 |
| 40 | 200 |
| 50 | 250 |
| 60 | 300 |
| 70 | 350 |
| 80 | 400 |
| 90 | 450 |
| 100 | 500 |