Convert carats to stones
1 ct = 0.00003149 st. Change the amount below, or read the formula and the reference table further down.
1 carat equals
stones
1 ct = 0.00003149 st
The formula
Carats and stones both measure weight & mass from the same zero, so a single multiplier does the job.
st = ct × 0.0000314946
Going the other way? Convert stones to carats.
Carats to stones table
Common values, rounded for reading.
| Carats (ct) | Stones (st) |
|---|---|
| 1 | 0.000031 |
| 2 | 0.000063 |
| 3 | 0.000094 |
| 4 | 0.000126 |
| 5 | 0.000157 |
| 6 | 0.000189 |
| 7 | 0.00022 |
| 8 | 0.000252 |
| 9 | 0.000283 |
| 10 | 0.000315 |
| 15 | 0.000472 |
| 20 | 0.00063 |
| 25 | 0.000787 |
| 30 | 0.000945 |
| 40 | 0.00126 |
| 50 | 0.001575 |
| 75 | 0.002362 |
| 100 | 0.003149 |
| 250 | 0.007874 |
| 500 | 0.015747 |
| 1,000 | 0.031495 |
Questions people ask
- How many stones are in a carat?
- One carat equals 0.0000314946 stones.
- How do I convert carats to stones by hand?
- Multiply the number of carats by 0.0000314946. For a rough check, 0 is close enough for most everyday use.
- What is 1 carat in stones?
- 1 carat is 0.00003149 stones.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.