Stone per Cubic Millimeter (st/mm3) expresses mass in stone per unit volume in cubic millimeter, found by dividing a mass value by a volume value.
Stone per Cubic Millimeter to Carat per Cubic Millimeter
Convert stone per cubic millimeter (st/mm3) to carat per cubic millimeter (ct/mm3) instantly with formula, conversion table, and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Density calculator
Density Converter
Convert stone per cubic millimeter (st/mm3) to carat per cubic millimeter (ct/mm3) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
Carat per Cubic Millimeter (ct/mm3) expresses mass in carat per unit volume in cubic millimeter, found by dividing a mass value by a volume value.
ct/mm3 = st/mm3 × 31751.4659
Results update instantly for Stone per Cubic Millimeter to Carat per Cubic Millimeter conversions.
Reserved above the conversion cards and below the converter.
Formula
ct/mm3 = st/mm3 × 31751.4659
st/mm3 = ct/mm3 × 3.149461e-5
Conversion table
| 1 st/mm3 | 31751.4659 ct/mm3 |
| 5 st/mm3 | 158757.3295 ct/mm3 |
| 10 st/mm3 | 317514.659 ct/mm3 |
| 20 st/mm3 | 635029.318 ct/mm3 |
| 50 st/mm3 | 1.587573e6 ct/mm3 |
| 100 st/mm3 | 3.175147e6 ct/mm3 |
| 500 st/mm3 | 1.587573e7 ct/mm3 |
| 1000 st/mm3 | 3.175147e7 ct/mm3 |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both stone per cubic millimeter and carat per cubic millimeter measure the same physical quantity (mass per unit volume), so converting between them is a single multiplication. Multiply a value in stone per cubic millimeter by 31751.4659 to get carat per cubic millimeter. To reverse the conversion, multiply a carat per cubic millimeter value by 3.149461e-5 to get back to stone per cubic millimeter.
Frequently asked questions
What is Stone per Cubic Millimeter (st/mm3)?
Stone per Cubic Millimeter (st/mm3) expresses mass in stone per unit volume in cubic millimeter, found by dividing a mass value by a volume value.
What is Carat per Cubic Millimeter (ct/mm3)?
Carat per Cubic Millimeter (ct/mm3) expresses mass in carat per unit volume in cubic millimeter, found by dividing a mass value by a volume value.
How do I convert stone per cubic millimeter to carat per cubic millimeter?
Multiply the stone per cubic millimeter value by 31751.4659 to get the equivalent in carat per cubic millimeter. For example, 5 st/mm3 × 31751.4659 = 158757.3295 ct/mm3.
Is this conversion exact?
Yes. Both units are defined using fixed metric and imperial conversion constants, so the factor 31751.4659 is an exact, non-rounded value.
Can I convert carat per cubic millimeter back to stone per cubic millimeter?
Yes. Divide the carat per cubic millimeter value by 31751.4659, or multiply it by 3.149461e-5, to get stone per cubic millimeter.
Reserved between the FAQ and the article so the page stays balanced.
About converting stone per cubic millimeter to carat per cubic millimeter
Stone per Cubic Millimeter (st/mm3) expresses mass in stone per unit volume in cubic millimeter, found by dividing a mass value by a volume value. Carat per Cubic Millimeter (ct/mm3) expresses mass in carat per unit volume in cubic millimeter, found by dividing a mass value by a volume value.
Use this calculator to move between stone per cubic millimeter and carat per cubic millimeter accurately for science, engineering, manufacturing, or everyday density calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.