Mass per volume density.
Stones per Cubic yard to Grains per Cubic Millimeter Converter — st/yd3 to gr/mm3
Convert Stone per Cubic yard (st/yd3) to Grain per Cubic Millimeter (gr/mm3) using the exact conversion factor (1 stone per cubic yard = 0.0001281792 grain per cubic millimeter). See the formula, worked examples, and conversion table.
Stones per Cubic yard to Grains per Cubic Millimeter 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 8.305869898 / 64798.91.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones per Cubic yard to Grains per Cubic Millimeter
Stone per Cubic yard and Grain per Cubic Millimeter 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
grains per cubic millimeter = stones per cubic yard × 0.000128179160693
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per cubic yard equals 8.30586989761 base units, and 1 grain per cubic millimeter equals 64798.91 base units, so dividing one by the other gives the direct stone per cubic yard-to-grain per cubic millimeter factor of 0.000128179160693.
Simple example
1 st/yd3 × 0.0001281791607 = 0.0001281792 gr/mm3
1 stone per cubic yard = 0.0001281792 grains per cubic millimeter.
Real-world example
1,000 st/yd3 × 0.0001281791607 = 0.1281791607 gr/mm3
1,000 stones per cubic yard = 0.1281791607 grains per cubic millimeter.
Conversion table
| Stone per Cubic yard (st/yd3) | Grain per Cubic Millimeter (gr/mm3) |
|---|---|
| 0.1 st/yd3 | 0.0000128179 gr/mm3 |
| 1 st/yd3 | 0.0001281792 gr/mm3 |
| 10 st/yd3 | 0.0012817916 gr/mm3 |
| 100 st/yd3 | 0.0128179161 gr/mm3 |
| 1,000 st/yd3 | 0.1281791607 gr/mm3 |
| 10,000 st/yd3 | 1.281791607 gr/mm3 |
Reverse conversion: Grain per Cubic Millimeter to Stone per Cubic yard
0.0001281792 gr/mm3 × 7801.580184 = 1.000000307 st/yd3
0.0001281792 grains per cubic millimeter = 1.000000307 stones per cubic yard.
stones per cubic yard = grains per cubic millimeter × 7801.58018351
For a page dedicated to this direction, see Grain per Cubic Millimeter to Stone per Cubic yard.
Understanding the Stone per Cubic yard (st/yd3)
Mass per volume density.
Understanding the Grain per Cubic Millimeter (gr/mm3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains per cubic millimeter are in 1 stone per cubic yard?
1 stone per cubic yard equals 0.0001281792 grains per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert stone per cubic yard to grain per cubic millimeter?
Multiply the stone per cubic yard value by 0.0001281791607. The converter above does this instantly to whatever precision you set.
How do I convert grain per cubic millimeter back to stone per cubic yard?
Use the reverse factor: 1 grain per cubic millimeter equals 7,801.580184 stones per cubic yard. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per cubic yard?
Stone per Cubic yard (st/yd3) is a unit of density.
What is a grain per cubic millimeter?
Grain per Cubic Millimeter (gr/mm3) is a unit of density.
Is the stone per cubic yard to grain per cubic millimeter conversion exact?
Yes. Both stone per cubic yard and grain per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 0.0001281791607 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.