Mass per volume density.
Grains per Cup to Carats per Cup Converter — gr/cup to ct/cup
Convert Grain per Cup (gr/cup) to Carat per Cup (ct/cup) using the exact conversion factor (1 grain per cup = 0.32399455 carat per cup). See the formula, worked examples, and conversion table.
Grains per Cup 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 0.2738889767 / 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 Cup to Carats per Cup
Grain per Cup 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 cup × 0.32399455
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per cup equals 0.273888976724 base units, and 1 carat per cup equals 0.845350567546 base units, so dividing one by the other gives the direct grain per cup-to-carat per cup factor of 0.32399455.
Simple example
1 gr/cup × 0.32399455 = 0.32399455 ct/cup
1 grain per cup = 0.32399455 carats per cup.
Real-world example
1,000 gr/cup × 0.32399455 = 323.99455 ct/cup
1,000 grains per cup = 323.99455 carats per cup.
Conversion table
| Grain per Cup (gr/cup) | Carat per Cup (ct/cup) |
|---|---|
| 0.1 gr/cup | 0.032399455 ct/cup |
| 1 gr/cup | 0.32399455 ct/cup |
| 10 gr/cup | 3.2399455 ct/cup |
| 100 gr/cup | 32.399455 ct/cup |
| 1,000 gr/cup | 323.99455 ct/cup |
| 10,000 gr/cup | 3,239.9455 ct/cup |
Reverse conversion: Carat per Cup to Grain per Cup
0.32399455 ct/cup × 3.086471671 = 1 gr/cup
0.32399455 carats per cup = 1 grains per cup.
grains per cup = carats per cup × 3.08647167059
For a page dedicated to this direction, see Carat per Cup to Grain per Cup.
Understanding the Grain per Cup (gr/cup)
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 cup?
1 grain per cup equals 0.32399455 carats per cup, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cup to carat per cup?
Multiply the grain per cup value by 0.32399455. The converter above does this instantly to whatever precision you set.
How do I convert carat per cup back to grain per cup?
Use the reverse factor: 1 carat per cup equals 3.086471671 grains per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per cup?
Grain per Cup (gr/cup) 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 cup to carat per cup conversion exact?
Yes. Both grain per cup and carat per cup are defined by fixed standards rather than physical artifacts, so the factor of 0.32399455 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.