How to Convert Stone to Carats (st to ct)
Weight units matter at the wet market, where older stalls and Chinese medical halls still quote prices per kati or tael, and when following American recipes in ounces and pounds. This guide shows how to convert stone into carats by hand, with examples and a quick-reference table.
The conversion
To convert stone to carats, multiply the value by 31,751.4659. To go the other way, divide by the same number (or multiply by 3.149461e-05). For a quick estimate, multiply by about 32,000.
Carats = stone × 31,751.4659
Worked examples
- 3 st = 95,254.4 ct
- 12.5 st = 396,893.32 ct
- 75 st = 2,381,359.94 ct
Stone to Carats table
| Stone | Carats |
|---|---|
| 1 st | 31,751.47 ct |
| 2 st | 63,502.93 ct |
| 5 st | 158,757.33 ct |
| 10 st | 317,514.66 ct |
| 20 st | 635,029.32 ct |
| 25 st | 793,786.65 ct |
| 50 st | 1,587,573.29 ct |
| 100 st | 3,175,146.59 ct |
| 250 st | 7,937,866.47 ct |
| 500 st | 15,875,732.95 ct |
| 1,000 st | 31,751,465.9 ct |
Common questions
Is st to ct exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Carats to Stone converter.
Mistakes to avoid
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Background
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
For any value, use the Stone to Carats Converter or browse all weight converters.
Run your own numbers: Stone to Carats Converter