Mass per volume density.
Carats per Cup to Stones per Fluid ounce Converter — ct/cup to st/fl oz
Convert Carat per Cup (ct/cup) to Stone per Fluid ounce (st/fl oz) using the exact conversion factor (1 carat per cup = 0.0000039368 stone per fluid ounce). See the formula, worked examples, and conversion table.
Carats per Cup to Stones per Fluid ounce 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 / 214728.9578.
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 Fluid ounce
Carat per Cup and Stone per Fluid ounce 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 fluid ounce = carats per cup × 0.00000393682611044
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 fluid ounce equals 214728.957752 base units, so dividing one by the other gives the direct carat per cup-to-stone per fluid ounce factor of 0.00000393682611044.
Simple example
1 ct/cup × 0.00000393682611 = 0.0000039368 st/fl oz
1 carat per cup = 0.0000039368 stones per fluid ounce.
Real-world example
1,000 ct/cup × 0.00000393682611 = 0.0039368261 st/fl oz
1,000 carats per cup = 0.0039368261 stones per fluid ounce.
Conversion table
| Carat per Cup (ct/cup) | Stone per Fluid ounce (st/fl oz) |
|---|---|
| 0.1 ct/cup | 3.936826e-7 st/fl oz |
| 1 ct/cup | 0.0000039368 st/fl oz |
| 10 ct/cup | 0.0000393683 st/fl oz |
| 100 ct/cup | 0.0003936826 st/fl oz |
| 1,000 ct/cup | 0.0039368261 st/fl oz |
| 10,000 ct/cup | 0.0393682611 st/fl oz |
Reverse conversion: Stone per Fluid ounce to Carat per Cup
0.0000039368 st/fl oz × 254011.7272 = 0.9999933676 ct/cup
0.0000039368 stones per fluid ounce = 0.9999933676 carats per cup.
carats per cup = stones per fluid ounce × 254011.7272
For a page dedicated to this direction, see Stone per Fluid ounce to Carat per Cup.
Understanding the Carat per Cup (ct/cup)
Mass per volume density.
Understanding the Stone per Fluid ounce (st/fl oz)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per fluid ounce are in 1 carat per cup?
1 carat per cup equals 0.0000039368 stones per fluid ounce, using the exact defined conversion factor rather than an estimate.
How do I convert carat per cup to stone per fluid ounce?
Multiply the carat per cup value by 0.00000393682611. The converter above does this instantly to whatever precision you set.
How do I convert stone per fluid ounce back to carat per cup?
Use the reverse factor: 1 stone per fluid ounce equals 254,011.7272 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 fluid ounce?
Stone per Fluid ounce (st/fl oz) is a unit of density.
Is the carat per cup to stone per fluid ounce conversion exact?
Yes. Both carat per cup and stone per fluid ounce are defined by fixed standards rather than physical artifacts, so the factor of 0.00000393682611 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.