Mass per volume density.
Carats per Cup to Stones per Tablespoon Converter — ct/cup to st/tbsp
Convert Carat per Cup (ct/cup) to Stone per Tablespoon (st/tbsp) using the exact conversion factor (1 carat per cup = 0.0000019684 stone per tablespoon). See the formula, worked examples, and conversion table.
Carats per Cup to Stones per Tablespoon 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 0.8453505675 / 429457.9155.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Carats per Cup to Stones per Tablespoon
Carat per Cup and Stone per Tablespoon 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 tablespoon = carats per cup × 0.00000196841305522
This factor comes from each unit's defined relationship to the category's base unit: 1 carat per cup equals 0.845350567546 base units, and 1 stone per tablespoon equals 429457.915504 base units, so dividing one by the other gives the direct carat per cup-to-stone per tablespoon factor of 0.00000196841305522.
Simple example
1 ct/cup × 0.000001968413055 = 0.0000019684 st/tbsp
1 carat per cup = 0.0000019684 stones per tablespoon.
Real-world example
1,000 ct/cup × 0.000001968413055 = 0.0019684131 st/tbsp
1,000 carats per cup = 0.0019684131 stones per tablespoon.
Conversion table
| Carat per Cup (ct/cup) | Stone per Tablespoon (st/tbsp) |
|---|---|
| 0.1 ct/cup | 1.968413e-7 st/tbsp |
| 1 ct/cup | 0.0000019684 st/tbsp |
| 10 ct/cup | 0.0000196841 st/tbsp |
| 100 ct/cup | 0.0001968413 st/tbsp |
| 1,000 ct/cup | 0.0019684131 st/tbsp |
| 10,000 ct/cup | 0.0196841306 st/tbsp |
Reverse conversion: Stone per Tablespoon to Carat per Cup
0.0000019684 st/tbsp × 508023.4544 = 0.9999933676 ct/cup
0.0000019684 stones per tablespoon = 0.9999933676 carats per cup.
carats per cup = stones per tablespoon × 508023.4544
For a page dedicated to this direction, see Stone per Tablespoon to Carat per Cup.
Understanding the Carat per Cup (ct/cup)
Mass per volume density.
Understanding the Stone per Tablespoon (st/tbsp)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per tablespoon are in 1 carat per cup?
1 carat per cup equals 0.0000019684 stones per tablespoon, using the exact defined conversion factor rather than an estimate.
How do I convert carat per cup to stone per tablespoon?
Multiply the carat per cup value by 0.000001968413055. The converter above does this instantly to whatever precision you set.
How do I convert stone per tablespoon back to carat per cup?
Use the reverse factor: 1 stone per tablespoon equals 508,023.4544 carats per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a carat per cup?
Carat per Cup (ct/cup) is a unit of density.
What is a stone per tablespoon?
Stone per Tablespoon (st/tbsp) is a unit of density.
Is the carat per cup to stone per tablespoon conversion exact?
Yes. Both carat per cup and stone per tablespoon are defined by fixed standards rather than physical artifacts, so the factor of 0.000001968413055 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.