Mass per volume density.
Grains per Fluid ounce to Carats per Cup Converter — gr/fl oz to ct/cup
Convert Grain per Fluid ounce (gr/fl oz) to Carat per Cup (ct/cup) using the exact conversion factor (1 grain per fluid ounce = 2.5919564 carat per cup). See the formula, worked examples, and conversion table.
Grains per Fluid ounce to Carats 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 2.191111814 / 0.8453505675.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Fluid ounce to Carats per Cup
Grain per Fluid ounce and Carat 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
carats per cup = grains per fluid ounce × 2.5919564
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per fluid ounce equals 2.19111181379 base units, and 1 carat per cup equals 0.845350567546 base units, so dividing one by the other gives the direct grain per fluid ounce-to-carat per cup factor of 2.5919564.
Simple example
1 gr/fl oz × 2.5919564 = 2.5919564 ct/cup
1 grain per fluid ounce = 2.5919564 carats per cup.
Real-world example
1,000 gr/fl oz × 2.5919564 = 2,591.9564 ct/cup
1,000 grains per fluid ounce = 2,591.9564 carats per cup.
Conversion table
| Grain per Fluid ounce (gr/fl oz) | Carat per Cup (ct/cup) |
|---|---|
| 0.1 gr/fl oz | 0.25919564 ct/cup |
| 1 gr/fl oz | 2.5919564 ct/cup |
| 10 gr/fl oz | 25.919564 ct/cup |
| 100 gr/fl oz | 259.19564 ct/cup |
| 1,000 gr/fl oz | 2,591.9564 ct/cup |
| 10,000 gr/fl oz | 25,919.564 ct/cup |
Reverse conversion: Carat per Cup to Grain per Fluid ounce
2.5919564 ct/cup × 0.3858089588 = 1 gr/fl oz
2.5919564 carats per cup = 1 grains per fluid ounce.
grains per fluid ounce = carats per cup × 0.385808958824
For a page dedicated to this direction, see Carat per Cup to Grain per Fluid ounce.
Understanding the Grain per Fluid ounce (gr/fl oz)
Mass per volume density.
Understanding the Carat per Cup (ct/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many carats per cup are in 1 grain per fluid ounce?
1 grain per fluid ounce equals 2.5919564 carats per cup, using the exact defined conversion factor rather than an estimate.
How do I convert grain per fluid ounce to carat per cup?
Multiply the grain per fluid ounce value by 2.5919564. The converter above does this instantly to whatever precision you set.
How do I convert carat per cup back to grain per fluid ounce?
Use the reverse factor: 1 carat per cup equals 0.3858089588 grains per fluid ounce. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per fluid ounce?
Grain per Fluid ounce (gr/fl oz) is a unit of density.
What is a carat per cup?
Carat per Cup (ct/cup) is a unit of density.
Is the grain per fluid ounce to carat per cup conversion exact?
Yes. Both grain per fluid ounce and carat per cup are defined by fixed standards rather than physical artifacts, so the factor of 2.5919564 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.