Grams to carats
1 gram = 5 carats
Type a value in grams (g) to get carats (ct) straight away. A gram is larger than a carat, so the number goes up. Both units belong to weight, measured here against the kilogram.
1 g = 5 ct
Formula
ct = g × 5
One gram is 5 carats, so multiply the gram value by that factor. Here g is the value in grams and ct is the result in carats.
Worked example: 250 grams × 5 = 1,250 carats.
Grams to carats table
| grams (g) | carats (ct) |
|---|---|
| 1 g | 5 ct |
| 2 g | 10 ct |
| 3 g | 15 ct |
| 4 g | 20 ct |
| 5 g | 25 ct |
| 6 g | 30 ct |
| 7 g | 35 ct |
| 8 g | 40 ct |
| 9 g | 45 ct |
| 10 g | 50 ct |
| 15 g | 75 ct |
| 20 g | 100 ct |
| 25 g | 125 ct |
| 30 g | 150 ct |
| 40 g | 200 ct |
| 50 g | 250 ct |
| 60 g | 300 ct |
| 75 g | 375 ct |
| 100 g | 500 ct |
Everyday grams in carats
| What it is | g | ct |
|---|---|---|
| a paper clip (about) | 1 g | 5 ct |
| a teaspoon of sugar (about) | 5 g | 25 ct |
| about one ounce | 28 g | 140 ct |
| the per-100 g line on food labels | 100 g | 500 ct |
| about one pound | 454 g | 2,270 ct |
Quick estimate in your head
Multiply by about 5. For 250 g that gives 1,250 ct against an exact 1,250 ct, an error under 0.1%.
Watch out for
- Carat (ct) is gemstone weight. Karat (K) is gold purity, where 24K is pure gold. They are unrelated.
About the units
Gram (g). One thousandth of a kilogram. Used for food, post and jewellery.
Carat (ct). Exactly 200 mg. Used for gemstones (not to be confused with karat, the gold purity scale).
Going the other way, 1 carat is 0.2 grams.
Questions
How many carats are in 1 gram?
1 gram is 5 carats, and 1 carat is 0.2 grams.
How do I convert grams to carats?
Use ct = g × 5. For example, 250 grams × 5 = 1,250 carats.
Is the gram to carat factor exact?
The factor comes from the unit definitions. Results here are rounded to 6 significant digits for display.
How much is about one pound in carats?
454 g is 2,270 ct.
Source for the conversion factor: NIST SP 811, Appendix B (conversion factors).