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.
Carat per Cubic Millimeter to Stone per Cubic Millimeter
Convert carat per cubic millimeter (ct/mm3) to stone per cubic millimeter (st/mm3) instantly with formula, conversion table, and FAQ.
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Convert carat per cubic millimeter (ct/mm3) to stone per cubic millimeter (st/mm3) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
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.
st/mm3 = ct/mm3 × 3.149461e-5
Results update instantly for Carat per Cubic Millimeter to Stone per Cubic Millimeter conversions.
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Formula
st/mm3 = ct/mm3 × 3.149461e-5
ct/mm3 = st/mm3 × 31751.4659
Conversion table
| 1 ct/mm3 | 3.149461e-5 st/mm3 |
| 5 ct/mm3 | 0.000157 st/mm3 |
| 10 ct/mm3 | 0.000315 st/mm3 |
| 20 ct/mm3 | 0.00063 st/mm3 |
| 50 ct/mm3 | 0.001575 st/mm3 |
| 100 ct/mm3 | 0.003149 st/mm3 |
| 500 ct/mm3 | 0.015747 st/mm3 |
| 1000 ct/mm3 | 0.031495 st/mm3 |
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How the formula works
Both carat per cubic millimeter and stone per cubic millimeter measure the same physical quantity (mass per unit volume), so converting between them is a single multiplication. Multiply a value in carat per cubic millimeter by 3.149461e-5 to get stone per cubic millimeter. To reverse the conversion, multiply a stone per cubic millimeter value by 31751.4659 to get back to carat per cubic millimeter.
Frequently asked questions
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.
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.
How do I convert carat per cubic millimeter to stone per cubic millimeter?
Multiply the carat per cubic millimeter value by 3.149461e-5 to get the equivalent in stone per cubic millimeter. For example, 5 ct/mm3 × 3.149461e-5 = 0.000157 st/mm3.
Is this conversion exact?
Yes. Both units are defined using fixed metric and imperial conversion constants, so the factor 3.149461e-5 is an exact, non-rounded value.
Can I convert stone per cubic millimeter back to carat per cubic millimeter?
Yes. Divide the stone per cubic millimeter value by 3.149461e-5, or multiply it by 31751.4659, to get carat per cubic millimeter.
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About converting carat per cubic millimeter to stone per cubic millimeter
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. 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.
Use this calculator to move between carat per cubic millimeter and stone 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.