Mass per volume density.
Carats per Cubic Millimeter to Stones per Teaspoon Converter — ct/mm3 to st/tsp
Convert Carat per Cubic Millimeter (ct/mm3) to Stone per Teaspoon (st/tsp) using the exact conversion factor (1 carat per cubic millimeter = 0.1552344578 stone per teaspoon). See the formula, worked examples, and conversion table.
Carats per Cubic Millimeter to Stones per Teaspoon converter
Converter
Density Converter
Convert thousands of mass-per-volume density combinations for science, engineering, agriculture, and fluids.
Context values
Some unit families need one extra value for a physically accurate result.
Mass per volume density.
Result = input x 200000 / 1.28837375e+6.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Carats per Cubic Millimeter to Stones per Teaspoon
Carat per Cubic Millimeter and Stone per Teaspoon both measure density — mass per unit volume — a property used to identify materials, check manufacturing quality, and predict whether something floats or sinks. As a fixed reference point, water has a density of exactly 1000 kg/m³ (1 g/cm³, 1 g/mL) at its temperature of maximum density, which is why many density figures in science and engineering are quoted relative to water. Both are mass per volume density units.
Formula
stones per teaspoon = carats per cubic millimeter × 0.155234457813
This factor comes from each unit's defined relationship to the category's base unit: 1 carat per cubic millimeter equals 200000 base units, and 1 stone per teaspoon equals 1288373.74651 base units, so dividing one by the other gives the direct carat per cubic millimeter-to-stone per teaspoon factor of 0.155234457813.
Simple example
1 ct/mm3 × 0.1552344578 = 0.1552344578 st/tsp
1 carat per cubic millimeter = 0.1552344578 stones per teaspoon.
Real-world example
1,000 ct/mm3 × 0.1552344578 = 155.2344578 st/tsp
1,000 carats per cubic millimeter = 155.2344578 stones per teaspoon.
Conversion table
| Carat per Cubic Millimeter (ct/mm3) | Stone per Teaspoon (st/tsp) |
|---|---|
| 0.1 ct/mm3 | 0.0155234458 st/tsp |
| 1 ct/mm3 | 0.1552344578 st/tsp |
| 10 ct/mm3 | 1.552344578 st/tsp |
| 100 ct/mm3 | 15.52344578 st/tsp |
| 1,000 ct/mm3 | 155.2344578 st/tsp |
| 10,000 ct/mm3 | 1,552.344578 st/tsp |
Reverse conversion: Stone per Teaspoon to Carat per Cubic Millimeter
0.1552344578 st/tsp × 6.441868733 = 0.9999999999 ct/mm3
0.1552344578 stones per teaspoon = 0.9999999999 carats per cubic millimeter.
carats per cubic millimeter = stones per teaspoon × 6.44186873256
For a page dedicated to this direction, see Stone per Teaspoon to Carat per Cubic Millimeter.
Understanding the Carat per Cubic Millimeter (ct/mm3)
Mass per volume density.
Understanding the Stone per Teaspoon (st/tsp)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per teaspoon are in 1 carat per cubic millimeter?
1 carat per cubic millimeter equals 0.1552344578 stones per teaspoon, using the exact defined conversion factor rather than an estimate.
How do I convert carat per cubic millimeter to stone per teaspoon?
Multiply the carat per cubic millimeter value by 0.1552344578. The converter above does this instantly to whatever precision you set.
How do I convert stone per teaspoon back to carat per cubic millimeter?
Use the reverse factor: 1 stone per teaspoon equals 6.441868733 carats per cubic millimeter. You can also use the swap control in the converter above to flip the direction instantly.
What is a carat per cubic millimeter?
Carat per Cubic Millimeter (ct/mm3) is a unit of density.
What is a stone per teaspoon?
Stone per Teaspoon (st/tsp) is a unit of density.
Is the carat per cubic millimeter to stone per teaspoon conversion exact?
Yes. Both carat per cubic millimeter and stone per teaspoon are defined by fixed standards rather than physical artifacts, so the factor of 0.1552344578 used above is exact to as many digits as you choose to display.
What's the difference between density and mass concentration?
Density is the mass of a pure substance or material per unit volume. Mass concentration is the mass of one component — like a dissolved solute — within a mixture's total volume. The two use the same kind of units but describe different physical situations.