Grains to Carats Converter

1 grain (gr) equals 0.32399455 carats (ct).

Quick answer

  • 1 grain = 0.32399455 carats
  • 1 carat = 3.086471671 grains
  • Formula: ct = gr × 0.32399455

1 grain = 0.32399455 carats

How to convert grains to carats

ct = gr × 0.32399455

To convert grains to carats, multiply the number of grains by 0.32399455.

Example: 18 gr to ct

  1. Start with the value in grains: 18 gr.
  2. Multiply by 0.32399455: 18 × 0.32399455 = 5.8319019.
  3. Result: 18 grains = 5.8319019 carats.

Going the other way, 1 carat = 3.08647167059 grains, so to convert carats back to grains you divide by the same number. See carats to grains.

Grains to carats conversion table

Grains (gr)Carats (ct)
0.25 gr 0.0809986375 ct
0.5 gr 0.161997275 ct
0.75 gr 0.2429959125 ct
1 gr 0.32399455 ct
1.5 gr 0.485991825 ct
2 gr 0.6479891 ct
2.5 gr 0.809986375 ct
3 gr 0.97198365 ct
4 gr 1.2959782 ct
5 gr 1.61997275 ct
6 gr 1.9439673 ct
7 gr 2.26796185 ct
8 gr 2.5919564 ct
9 gr 2.91595095 ct
10 gr 3.2399455 ct
11 gr 3.56394005 ct
12 gr 3.8879346 ct
13 gr 4.21192915 ct
14 gr 4.5359237 ct
15 gr 4.85991825 ct
16 gr 5.1839128 ct
17 gr 5.50790735 ct
18 gr 5.8319019 ct
19 gr 6.15589645 ct
20 gr 6.479891 ct
21 gr 6.80388555 ct
22 gr 7.1278801 ct
23 gr 7.45187465 ct
24 gr 7.7758692 ct
25 gr 8.09986375 ct
26 gr 8.4238583 ct
27 gr 8.74785285 ct
28 gr 9.0718474 ct
29 gr 9.39584195 ct
30 gr 9.7198365 ct
31 gr 10.04383105 ct
32 gr 10.3678256 ct
33 gr 10.69182015 ct
34 gr 11.0158147 ct
35 gr 11.33980925 ct

More gr to ct values

What is a grain?

The grain is the smallest unit in the avoirdupois, troy and apothecaries' systems, and it is the same in all three: exactly 64.79891 milligrams.

More about grains →

What is a carat?

The carat is the unit of mass for gemstones and pearls, equal to exactly 200 milligrams.

More about carats →

Convert grains to other units

Convert other units to carats

Frequently asked questions

How many carats are in a grain?

One grain is 0.32399455 carats.

How many grains are in a carat?

One carat is 3.086471671 grains.

What is the formula to convert grains to carats?

ct = gr × 0.32399455.