Mass per volume density.
Carats per Cubic foot to Stones per Cup Converter — ct/ft3 to st/cup
Convert Carat per Cubic foot (ct/ft3) to Stone per Cup (st/cup) using the exact conversion factor (1 carat per cubic foot = 2.631386e-7 stone per cup). See the formula, worked examples, and conversion table.
Carats per Cubic foot 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 0.007062933344 / 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 Cubic foot to Stones per Cup
Carat per Cubic foot 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 cubic foot × 2.631386e-7
This factor comes from each unit's defined relationship to the category's base unit: 1 carat per cubic foot equals 0.0070629333443 base units, and 1 stone per cup equals 26841.119719 base units, so dividing one by the other gives the direct carat per cubic foot-to-stone per cup factor of 2.631386e-7.
Simple example
1 ct/ft3 × 2.631386e-7 = 2.631386e-7 st/cup
1 carat per cubic foot = 2.631386e-7 stones per cup.
Real-world example
1,000 ct/ft3 × 2.631386e-7 = 0.0002631386 st/cup
1,000 carats per cubic foot = 0.0002631386 stones per cup.
Conversion table
| Carat per Cubic foot (ct/ft3) | Stone per Cup (st/cup) |
|---|---|
| 0.1 ct/ft3 | 2.631386e-8 st/cup |
| 1 ct/ft3 | 2.631386e-7 st/cup |
| 10 ct/ft3 | 0.0000026314 st/cup |
| 100 ct/ft3 | 0.0000263139 st/cup |
| 1,000 ct/ft3 | 0.0002631386 st/cup |
| 10,000 ct/ft3 | 0.0026313855 st/cup |
Reverse conversion: Stone per Cup to Carat per Cubic foot
2.631386e-7 st/cup × 3800279.347 = 1.000000187 ct/ft3
2.631386e-7 stones per cup = 1.000000187 carats per cubic foot.
carats per cubic foot = stones per cup × 3800279.3472
For a page dedicated to this direction, see Stone per Cup to Carat per Cubic foot.
Understanding the Carat per Cubic foot (ct/ft3)
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 cubic foot?
1 carat per cubic foot equals 2.631386e-7 stones per cup, using the exact defined conversion factor rather than an estimate.
How do I convert carat per cubic foot to stone per cup?
Multiply the carat per cubic foot value by 2.631386e-7. The converter above does this instantly to whatever precision you set.
How do I convert stone per cup back to carat per cubic foot?
Use the reverse factor: 1 stone per cup equals 3,800,279.347 carats per cubic foot. You can also use the swap control in the converter above to flip the direction instantly.
What is a carat per cubic foot?
Carat per Cubic foot (ct/ft3) 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 cubic foot to stone per cup conversion exact?
Yes. Both carat per cubic foot and stone per cup are defined by fixed standards rather than physical artifacts, so the factor of 2.631386e-7 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.