Stone to Carat Converter
Weight · unit-converter
Convert Stone to Carat with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use gram-based factors (international avoirdupois pound and metric definitions). The full Weight Converter also includes carat, grain, and US/UK hundredweight.
Calculator
From: Stone (st)
To: Carat (ct)
About Stone
The stone is 14 pounds (UK and Ireland). It is often used for human body weight in those regions.
About Carat
The metric carat is exactly 0.2 grams (200 mg), commonly used for gemstones and jewelry.
How to convert stone to carats
1 stone is equal to 31751.4658999999956 carat:
1 st = (6350.29318 g ÷ 0.2 g) ct = 31751.4658999999956 ct
Each stone is defined as 6350.29318 g and each carat as 0.2 g, so one st equals 6350.29318 ÷ 0.2 ct = 31751.4658999999956 ct.
Let w(st) be the numeric value of the same mass measured in Stone (st), and w(ct) the value in Carat (ct). Then:
w(ct) = w(st) × (6350.29318 / 0.2)
Equivalently, divide by how many st fit into one ct (grams per ct divided by grams per st):
w(ct) = w(st) ÷ 0.00003149460888
Or: carat = stone ÷ 0.00003149460888
Examples
Example #1: Convert 20 st to carat
20 st = 20 st × (6350.29318/0.2) ct = 635029.318 ct
20 st = 20 st ÷ 0.00003149460888 = 635029.318 ct
Example #2: Convert 50 st to carat
50 st = 50 st × (6350.29318/0.2) ct = 1587573.2949999999 ct
50 st = 50 st ÷ 0.00003149460888 = 1587573.2949999999 ct
Summary
To convert Stone to Carat, multiply the value in st by the ratio of grams per st divided by grams per ct. Equivalently: value_ct = value_st × (6350.29318 / 0.2). Numerically, 1 st equals 31751.465899999996 ct.
Relationship context
You are converting between imperial / UK (stone, long ton, pound, ounce) (Stone) and metric (SI) (Carats). Metric mass is decimal from the gram; US and imperial masses use pounds and ounces with fixed definitions relative to the kilogram. The numeric factor used here is 3.175147e+4.
Conversion tables
| Stone (st) | Carat (ct) |
|---|---|
| 0.1 | 3,175.14659 |
| 1 | 31,751.4659 |
| 2 | 63,502.9318 |
| 3 | 95,254.3977 |
| 4 | 127,005.8636 |
| 5 | 158,757.3295 |
| 6 | 190,508.7954 |
| 7 | 222,260.2613 |
| 8 | 254,011.7272 |
| 9 | 285,763.1931 |
| Stone (st) | Carat (ct) |
|---|---|
| 10 | 317,514.659 |
| 20 | 635,029.318 |
| 30 | 952,543.977 |
| 40 | 1,270,058.6359999999 |
| 50 | 1,587,573.2949999999 |
| 60 | 1,905,087.9539999999 |
| 70 | 2,222,602.6129999999 |
| 80 | 2,540,117.2719999999 |
| 90 | 2,857,631.9309999999 |
| 100 | 3,175,146.5899999999 |