Grams to Carats Converter
Convert stone and jewelry weights from grams (g) to carats (ct) using the exact metric definition: 1 g = 5 ct. Includes reverse conversion for listing diamonds or gemstones in grams.
Convert weight
Jewelry presets (g):
Result
Carats: –
Factor used: 1 g = 5 ct
Reverse (ct → g)
Grams to carats formula
The modern metric carat (used worldwide for diamonds and gemstones) is defined as exactly 0.2 grams. That means:
1 ct = 0.2 g1 g = 1 ÷ 0.2 = 5 ct
So the working formula is:
carats = grams × 5
Example: 0.35 g × 5 = 1.75 ct.
Reverse:
grams = carats × 0.2
Quick reference table
| Grams (g) | Carats (ct) |
|---|---|
| 0.10 g | 0.50 ct |
| 0.20 g | 1.00 ct |
| 0.35 g | 1.75 ct |
| 0.50 g | 2.50 ct |
| 1.00 g | 5.00 ct |
| 2.00 g | 10.00 ct |
| 5.00 g | 25.00 ct |
FAQ
Is this different from “karat”?
Yes. “Carat” (ct) is a unit of mass for gemstones. “Karat” (K) is a unit of gold purity. This tool is for gemstone weight.
Why is 1 g = 5 ct so neat?
Because the metric carat was deliberately fixed at 0.2 g to make decimal conversions easy, especially for trading and valuation.