Mass per volume density.
Grains per Cup to Stone per Cubic inches Converter — gr/cup to st/in3
Convert Grain per Cup (gr/cup) to Stone per Cubic inch (st/in3) using the exact conversion factor (1 grain per cup = 7.067762e-7 stone per cubic inch). See the formula, worked examples, and conversion table.
Grains per Cup to Stone per Cubic inches 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 / 387518.6659.
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 Stone per Cubic inches
Grain per Cup and Stone per Cubic inch 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
stone per cubic inches = grains per cup × 7.067762e-7
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 stone per cubic inch equals 387518.665943 base units, so dividing one by the other gives the direct grain per cup-to-stone per cubic inch factor of 7.067762e-7.
Simple example
1 gr/cup × 7.067762e-7 = 7.067762e-7 st/in3
1 grain per cup = 7.067762e-7 stone per cubic inches.
Real-world example
1,000 gr/cup × 7.067762e-7 = 0.0007067762 st/in3
1,000 grains per cup = 0.0007067762 stone per cubic inches.
Conversion table
| Grain per Cup (gr/cup) | Stone per Cubic inch (st/in3) |
|---|---|
| 0.1 gr/cup | 7.067762e-8 st/in3 |
| 1 gr/cup | 7.067762e-7 st/in3 |
| 10 gr/cup | 0.0000070678 st/in3 |
| 100 gr/cup | 0.0000706776 st/in3 |
| 1,000 gr/cup | 0.0007067762 st/in3 |
| 10,000 gr/cup | 0.0070677622 st/in3 |
Reverse conversion: Stone per Cubic inch to Grain per Cup
7.067762e-7 st/in3 × 1414875 = 0.999999976 gr/cup
7.067762e-7 stone per cubic inches = 0.999999976 grains per cup.
grains per cup = stone per cubic inches × 1414875
For a page dedicated to this direction, see Stone per Cubic inch to Grain per Cup.
Understanding the Grain per Cup (gr/cup)
Mass per volume density.
Understanding the Stone per Cubic inch (st/in3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stone per cubic inches are in 1 grain per cup?
1 grain per cup equals 7.067762e-7 stone per cubic inches, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cup to stone per cubic inch?
Multiply the grain per cup value by 7.067762e-7. The converter above does this instantly to whatever precision you set.
How do I convert stone per cubic inch back to grain per cup?
Use the reverse factor: 1 stone per cubic inch equals 1,414,875 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 stone per cubic inch?
Stone per Cubic inch (st/in3) is a unit of density.
Is the grain per cup to stone per cubic inch conversion exact?
Yes. Both grain per cup and stone per cubic inch are defined by fixed standards rather than physical artifacts, so the factor of 7.067762e-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.