1. How to convert carats to grams
The conversion is a single multiplication: g = ct × 0.2. Both units are defined
against the same base — the kilogram (kg) — so the factor is fixed and the result
is exact to the precision shown.
Worked at the two values people ask for most: 1 ct = 0.2 g and
10 ct = 2 g. Going the other way, ct = g × 5, so
1 g = 5 ct.
Results are given to eight significant figures. That is more precision than most jobs need — for a rough figure, use 1 ct = 0.2 g and adjust — but rounding early and multiplying afterwards is how a small error becomes a visible one, so the full figure is what the converter carries.
2. Carats to Grams conversion table
| Carats (ct) | Grams (g) |
|---|---|
| 1 ct | 0.2 g |
| 2 ct | 0.4 g |
| 5 ct | 1 g |
| 10 ct | 2 g |
| 20 ct | 4 g |
| 25 ct | 5 g |
| 50 ct | 10 g |
| 70 ct | 14 g |
| 75 ct | 15 g |
| 100 ct | 20 g |
Every row is the same factor applied — nothing in the table is a special case, and any value in between behaves the same way. Type your own figure into the converter above and the Formula tile shows the arithmetic being used, so the result is checkable rather than taken on trust.
3. What the two units are
- Carats (ct). One ct is 0.0002 kg.
- Grams (g). One g is 0.001 kg.
Both are converted through the kilogram (kg): the value is multiplied by its own unit's factor to reach the base, then divided by the target unit's factor to leave it. No direct carats to grams factor has to exist or be kept correct, which is also why the converter can show the same value in all 10 weight & mass units at once.
Weight and mass are treated as one quantity here, as everyday use does. The pound is exactly 0.45359237 kg by definition, so an ounce is exactly a sixteenth of that and a stone exactly fourteen pounds. Watch the tons: a US short ton is 2,000 lb, a UK long ton is 2,240 lb and a tonne is exactly 1,000 kg.
If the pair you actually want is not this one, the full unit converter runs every 10 weight & mass units off the same factor table, along with 11 other categories of measurement.
4. Carats to Grams FAQs
How do I convert carats to grams?
Multiply by 0.2. 1 ct = 0.2 g, and 10 ct = 2 g. The factor is exact to the precision shown, so the only rounding is the one you choose to do at the end.
How many grams is 1 ct?
1 ct = 0.2 g. The full formula is g = ct × 0.2, and 1 g = 5 ct going the other way.
What is 10 ct in g?
10 ct = 2 g. The table above works the same factor through 10 values, and the converter takes any figure you type — including decimals.
How do I convert g to ct?
ct = g × 5, so 1 g = 5 ct. Use the Swap button in the converter to reverse the direction without retyping the value.
Is this weight or mass?
Both, treated as one quantity as everyday use does. The pound is defined as exactly 0.45359237 kg, so the conversion is exact. The kilogram is strictly a unit of mass and the pound-force a unit of weight, but the distinction only matters off this planet.
Is anything I type sent to a server?
No. The factor table ships with the page and every conversion runs in your browser. Nothing is uploaded, logged or written to storage, and the converter keeps working offline once the page has loaded.