Mass per volume density.
Carats per Teaspoon to Stones per Cup Converter — ct/tsp to st/cup
Convert Carat per Teaspoon (ct/tsp) to Stone per Cup (st/cup) using the exact conversion factor (1 carat per teaspoon = 0.0015117412 stone per cup). See the formula, worked examples, and conversion table.
Carats per Teaspoon to Stones per Cup 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 40.57682724 / 26841.11972.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Carats per Teaspoon to Stones per Cup
Carat per Teaspoon and Stone per Cup 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 cup = carats per teaspoon × 0.00151174122641
This factor comes from each unit's defined relationship to the category's base unit: 1 carat per teaspoon equals 40.5768272422 base units, and 1 stone per cup equals 26841.119719 base units, so dividing one by the other gives the direct carat per teaspoon-to-stone per cup factor of 0.00151174122641.
Simple example
1 ct/tsp × 0.001511741226 = 0.0015117412 st/cup
1 carat per teaspoon = 0.0015117412 stones per cup.
Real-world example
1,000 ct/tsp × 0.001511741226 = 1.511741226 st/cup
1,000 carats per teaspoon = 1.511741226 stones per cup.
Conversion table
| Carat per Teaspoon (ct/tsp) | Stone per Cup (st/cup) |
|---|---|
| 0.1 ct/tsp | 0.0001511741 st/cup |
| 1 ct/tsp | 0.0015117412 st/cup |
| 10 ct/tsp | 0.0151174123 st/cup |
| 100 ct/tsp | 0.1511741226 st/cup |
| 1,000 ct/tsp | 1.511741226 st/cup |
| 10,000 ct/tsp | 15.11741226 st/cup |
Reverse conversion: Stone per Cup to Carat per Teaspoon
0.0015117412 st/cup × 661.4888729 = 0.9999999825 ct/tsp
0.0015117412 stones per cup = 0.9999999825 carats per teaspoon.
carats per teaspoon = stones per cup × 661.488872917
For a page dedicated to this direction, see Stone per Cup to Carat per Teaspoon.
Understanding the Carat per Teaspoon (ct/tsp)
Mass per volume density.
Understanding the Stone per Cup (st/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per cup are in 1 carat per teaspoon?
1 carat per teaspoon equals 0.0015117412 stones per cup, using the exact defined conversion factor rather than an estimate.
How do I convert carat per teaspoon to stone per cup?
Multiply the carat per teaspoon value by 0.001511741226. The converter above does this instantly to whatever precision you set.
How do I convert stone per cup back to carat per teaspoon?
Use the reverse factor: 1 stone per cup equals 661.4888729 carats per teaspoon. You can also use the swap control in the converter above to flip the direction instantly.
What is a carat per teaspoon?
Carat per Teaspoon (ct/tsp) is a unit of density.
What is a stone per cup?
Stone per Cup (st/cup) is a unit of density.
Is the carat per teaspoon to stone per cup conversion exact?
Yes. Both carat per teaspoon and stone per cup are defined by fixed standards rather than physical artifacts, so the factor of 0.001511741226 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.