Convert Stone to Carats
1 stone (st) equals 31751.4659 carats (ct).
1 st = 31751.4659 ct
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk stone to carat converter to paste a column from Excel.
How to Convert Stone to Carat
- 1 st = 31751.4659 ct
- 1 ct = 0.00003149460888 st
- Example: convert 15 st to ct: 15 st = 15 × 31751.4659 ct = 476271.9885 ct
Reference conditions. st: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
ct = st × 31751.4659
Derivation from SI units:
- 1 st = 14 lb = 6.35029318 kg (exact)
- 1 ct = 200 mg (metric carat, exact)
- 1 st = 6.35029318 kg ÷ 0.0002 kg per ct = 31751.4659 ct
Both units are defined exactly, so the factor is exact. Stone definition: stone; Carat definition: carat.
Worked examples
- A reading of 10 st converts to 317514.659 ct.
10 st × 31751.4659 = 317514.659 ct - A value of 14 st is 444520.5226 ct.
14 st × 31751.4659 = 444520.5226 ct
Stone to Carat conversion table
| Stone (st) | Carats (ct) |
|---|---|
| 1 st | 31751.4659 ct |
| 5 st | 158757.3295 ct |
| 7 st | 222260.2613 ct |
| 8 st | 254011.7272 ct |
| 9 st | 285763.1931 ct |
| 10 st | 317514.659 ct |
| 10.5 st | 333390.392 ct |
| 11 st | 349266.1249 ct |
| 12 st | 381017.5908 ct |
| 13 st | 412769.0567 ct |
| 14 st | 444520.5226 ct |
| 15 st | 476271.9885 ct |
| 16 st | 508023.4544 ct |
| 18 st | 571526.3862 ct |
| 20 st | 635029.318 ct |
Where it's used
Stone are used for body weight in the UK and Ireland (e.g. 11 st 6 lb), while carats appear in diamonds and gemstones. Both measure mass (commonly called weight), so the conversion is a fixed factor.
Stone to other weight and mass units
| Conversion | 1 st equals |
|---|---|
| stone to kilogram | 6.35029318 kg |
| stone to gram | 6350.29318 g |
| stone to milligram | 6350293.18 mg |
| stone to microgram | 6350293180 µg |
| stone to metric ton | 0.00635029318 t |
| stone to pound | 14 lb |
| stone to ounce | 224 oz |
| stone to short ton | 0.007 ton (US) |
| stone to long ton | 0.00625 ton (UK) |
| stone to grain | 98000 gr |
| stone to troy ounce | 204.1666667 oz t |
| stone to carat | 31751.4659 ct |
Frequently asked questions
How many carats are in 1 stone?
1 st = 31751.4659 ct.
How do I convert stone to carats?
Multiply the value in st by 31751.4659. For example, 15 st × 31751.4659 = 476271.9885 ct.
Is the st to ct conversion exact?
Yes. Both units are defined exactly, and 1 st is exactly 31751.4659 ct.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, pound (avoirdupois).
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "carat, metric".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Stone to Carats. Retrieved October 17, 2026, from https://scientificconverters.com/mass/stone-to-carats/
IEEE
Scientific Converters, "Convert Stone to Carats," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/stone-to-carats/