Carats (ct) to Stone (st) Converter
Enter a value to instantly convert between weight units.
1 Carat = 0 Stone
Key Formulas
Kilogram → Pound
lb = kg × 2.20462Pound → Kilogram
kg = lb × 0.453592Gram → Ounce
oz = g × 0.035274Ounce → Gram
g = oz × 28.3495Formula
st = ct × 0.0000315One carat is 0.2 grams, and since one stone is 6350 grams, one carat is about 1/31,751 of a stone — roughly 0.0000315. This conversion is essentially never needed in practice since carats are for gemstones and stone is for body weight — these units don't overlap in real-world applications.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A historical UK record showing 31,751 carats of weight is exactly 1 stone — for the archive.
31751.47 ct = 1 st
A gemology research project converting 100,000 carats to stone for comparison — 3.15 st.
100000 ct = 3.15 st
A historical weight comparison converting 50,000 carats to stone — 1.575 st.
50000 ct = 1.575 st
A UK antique weight study converting 10,000 carats to stone — 0.315 st.
10000 ct = 0.315 st